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azurelinux-securityakhila-gurujuKanishk-Bansaljslobodzian
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[AutoPR- Security] Patch vitess for CVE-2026-27969, CVE-2026-27965 [CRITICAL] (#16083)
Co-authored-by: akhila-guruju <v-guakhila@microsoft.com> Co-authored-by: Kanishk Bansal <103916909+Kanishk-Bansal@users.noreply.github.com> Co-authored-by: jslobodzian <joslobo@microsoft.com>
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‎SPECS/vitess/CVE-2026-27965.patch‎

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From 4c0173293907af9cb942a6683c465c3f1e9fdb5c Mon Sep 17 00:00:00 2001
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From: Tim Vaillancourt <tim@timvaillancourt.com>
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Date: Tue, 24 Feb 2026 20:21:37 +0100
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Subject: [PATCH] Restore: make loading compressor commands from `MANIFEST`
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opt-in (#19460)
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Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>
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Co-authored-by: Mohamed Hamza <mhamza@fastmail.com>
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Upstream Patch reference: https://github.com/vitessio/vitess/commit/4c0173293907af9cb942a6683c465c3f1e9fdb5c.patch
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---
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go/flags/endtoend/vtbackup.txt | 1 +
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go/flags/endtoend/vttablet.txt | 1 +
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go/flags/endtoend/vttestserver.txt | 1 +
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.../backup/vtctlbackup/backup_test.go | 1 +
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.../backup/vtctlbackup/backup_utils.go | 4 +
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.../backup/xtrabackup/xtrabackup_test.go | 1 +
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go/vt/mysqlctl/builtinbackupengine.go | 5 +-
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go/vt/mysqlctl/compression.go | 18 +++-
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.../compression_external_decompressor_test.go | 93 +++++++++++++++++++
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go/vt/mysqlctl/xtrabackupengine.go | 5 +-
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10 files changed, 121 insertions(+), 9 deletions(-)
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create mode 100644 go/vt/mysqlctl/compression_external_decompressor_test.go
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diff --git a/go/flags/endtoend/vtbackup.txt b/go/flags/endtoend/vtbackup.txt
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index e979381..2895154 100644
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--- a/go/flags/endtoend/vtbackup.txt
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+++ b/go/flags/endtoend/vtbackup.txt
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@@ -79,6 +79,7 @@ Usage of vtbackup:
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--emit_stats If set, emit stats to push-based monitoring and stats backends
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--external-compressor string command with arguments to use when compressing a backup.
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--external-compressor-extension string extension to use when using an external compressor.
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+ --external-decompressor-use-manifest allows the decompressor command stored in the backup manifest to be used at restore time. Enabling this is a security risk: an attacker with write access to the backup storage could modify the manifest to execute arbitrary commands on the tablet as the Vitess user. NOT RECOMMENDED.
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--external-decompressor string command with arguments to use when decompressing a backup.
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--file_backup_storage_root string Root directory for the file backup storage.
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--gcs_backup_storage_bucket string Google Cloud Storage bucket to use for backups.
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diff --git a/go/flags/endtoend/vttablet.txt b/go/flags/endtoend/vttablet.txt
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index f431979..0d4c39f 100644
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--- a/go/flags/endtoend/vttablet.txt
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+++ b/go/flags/endtoend/vttablet.txt
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@@ -117,6 +117,7 @@ Usage of vttablet:
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--external-compressor string command with arguments to use when compressing a backup.
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--external-compressor-extension string extension to use when using an external compressor.
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--external-decompressor string command with arguments to use when decompressing a backup.
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+ --external-decompressor-use-manifest allows the decompressor command stored in the backup manifest to be used at restore time. Enabling this is a security risk: an attacker with write access to the backup storage could modify the manifest to execute arbitrary commands on the tablet as the Vitess user. NOT RECOMMENDED.
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--file_backup_storage_root string Root directory for the file backup storage.
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--filecustomrules string file based custom rule path
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--filecustomrules_watch set up a watch on the target file and reload query rules when it changes
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diff --git a/go/flags/endtoend/vttestserver.txt b/go/flags/endtoend/vttestserver.txt
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index 668e31f..cdcba7a 100644
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--- a/go/flags/endtoend/vttestserver.txt
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+++ b/go/flags/endtoend/vttestserver.txt
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@@ -33,6 +33,7 @@ Usage of vttestserver:
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--external-compressor string command with arguments to use when compressing a backup.
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--external-compressor-extension string extension to use when using an external compressor.
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--external-decompressor string command with arguments to use when decompressing a backup.
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+ --external-decompressor-use-manifest allows the decompressor command stored in the backup manifest to be used at restore time. Enabling this is a security risk: an attacker with write access to the backup storage could modify the manifest to execute arbitrary commands on the tablet as the Vitess user. NOT RECOMMENDED.
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--external_topo_global_root string the path of the global topology data in the global topology server for vtcombo process
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--external_topo_global_server_address string the address of the global topology server for vtcombo process
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--external_topo_implementation string the topology implementation to use for vtcombo process
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diff --git a/go/test/endtoend/backup/vtctlbackup/backup_test.go b/go/test/endtoend/backup/vtctlbackup/backup_test.go
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index 92c7a2f..154f2d1 100644
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--- a/go/test/endtoend/backup/vtctlbackup/backup_test.go
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+++ b/go/test/endtoend/backup/vtctlbackup/backup_test.go
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@@ -57,6 +57,7 @@ func TestBuiltinBackupWithExternalZstdCompressionAndManifestedDecompressor(t *te
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CompressorEngineName: "external",
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ExternalCompressorCmd: "zstd",
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ExternalCompressorExt: ".zst",
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+ ExternalDecompressorUseManifest: true,
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ManifestExternalDecompressorCmd: "zstd -d",
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}
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diff --git a/go/test/endtoend/backup/vtctlbackup/backup_utils.go b/go/test/endtoend/backup/vtctlbackup/backup_utils.go
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index d93b932..78a0e57 100644
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--- a/go/test/endtoend/backup/vtctlbackup/backup_utils.go
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+++ b/go/test/endtoend/backup/vtctlbackup/backup_utils.go
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@@ -95,6 +95,7 @@ type CompressionDetails struct {
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ExternalCompressorCmd string
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ExternalCompressorExt string
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ExternalDecompressorCmd string
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+ ExternalDecompressorUseManifest bool
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ManifestExternalDecompressorCmd string
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}
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@@ -263,6 +264,9 @@ func getCompressorArgs(cDetails *CompressionDetails) []string {
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if cDetails.ExternalDecompressorCmd != "" {
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args = append(args, fmt.Sprintf("--external-decompressor=%s", cDetails.ExternalDecompressorCmd))
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}
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+ if cDetails.ExternalDecompressorUseManifest {
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+ args = append(args, "--external-decompressor-use-manifest")
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+ }
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if cDetails.ManifestExternalDecompressorCmd != "" {
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args = append(args, fmt.Sprintf("--manifest-external-decompressor=%s", cDetails.ManifestExternalDecompressorCmd))
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}
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diff --git a/go/test/endtoend/backup/xtrabackup/xtrabackup_test.go b/go/test/endtoend/backup/xtrabackup/xtrabackup_test.go
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index 3402a17..e18f229 100644
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--- a/go/test/endtoend/backup/xtrabackup/xtrabackup_test.go
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+++ b/go/test/endtoend/backup/xtrabackup/xtrabackup_test.go
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@@ -59,6 +59,7 @@ func TestXtrabackupWithExternalZstdCompressionAndManifestedDecompressor(t *testi
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CompressorEngineName: "external",
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ExternalCompressorCmd: "zstd",
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ExternalCompressorExt: ".zst",
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+ ExternalDecompressorUseManifest: true,
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ManifestExternalDecompressorCmd: "zstd -d",
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}
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diff --git a/go/vt/mysqlctl/builtinbackupengine.go b/go/vt/mysqlctl/builtinbackupengine.go
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index 8fac602..1106a65 100644
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--- a/go/vt/mysqlctl/builtinbackupengine.go
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+++ b/go/vt/mysqlctl/builtinbackupengine.go
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@@ -1020,10 +1020,7 @@ func (be *BuiltinBackupEngine) restoreFile(ctx context.Context, params RestorePa
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// for backward compatibility
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deCompressionEngine = PgzipCompressor
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}
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- externalDecompressorCmd := ExternalDecompressorCmd
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- if externalDecompressorCmd == "" && bm.ExternalDecompressor != "" {
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- externalDecompressorCmd = bm.ExternalDecompressor
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- }
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+ externalDecompressorCmd := resolveExternalDecompressor(bm.ExternalDecompressor)
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if externalDecompressorCmd != "" {
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if deCompressionEngine == ExternalCompressor {
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deCompressionEngine = externalDecompressorCmd
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diff --git a/go/vt/mysqlctl/compression.go b/go/vt/mysqlctl/compression.go
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index c2d3cbb..5737b70 100644
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--- a/go/vt/mysqlctl/compression.go
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+++ b/go/vt/mysqlctl/compression.go
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@@ -52,9 +52,10 @@ var (
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ExternalCompressorCmd string
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ExternalCompressorExt string
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ExternalDecompressorCmd string
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+ ExternalDecompressorUseManifest bool
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ManifestExternalDecompressorCmd string
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- errUnsupportedDeCompressionEngine = errors.New("unsupported engine in MANIFEST. You need to provide --external-decompressor if using 'external' compression engine")
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+ errUnsupportedDeCompressionEngine = errors.New("unsupported engine in MANIFEST. You need to provide --external-decompressor if using 'external' compression engine. Alternatively, set --external-decompressor-use-manifest to use the decompressor command from the backup manifest, but this is NOT RECOMMENDED as it is a security risk")
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errUnsupportedCompressionEngine = errors.New("unsupported engine value for --compression-engine-name. supported values are 'external', 'pgzip', 'pargzip', 'zstd', 'lz4'")
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// this is used by getEngineFromExtension() to figure out which engine to use in case the user didn't specify
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@@ -77,6 +78,7 @@ func registerBackupCompressionFlags(fs *pflag.FlagSet) {
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fs.StringVar(&ExternalCompressorCmd, "external-compressor", ExternalCompressorCmd, "command with arguments to use when compressing a backup.")
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fs.StringVar(&ExternalCompressorExt, "external-compressor-extension", ExternalCompressorExt, "extension to use when using an external compressor.")
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fs.StringVar(&ExternalDecompressorCmd, "external-decompressor", ExternalDecompressorCmd, "command with arguments to use when decompressing a backup.")
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+ fs.BoolVar(&ExternalDecompressorUseManifest, "external-decompressor-use-manifest", ExternalDecompressorUseManifest, "allows the decompressor command stored in the backup manifest to be used at restore time. Enabling this is a security risk: an attacker with write access to the backup storage could modify the manifest to execute arbitrary commands on the tablet as the Vitess user. NOT RECOMMENDED.")
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fs.StringVar(&ManifestExternalDecompressorCmd, "manifest-external-decompressor", ManifestExternalDecompressorCmd, "command with arguments to store in the backup manifest when compressing a backup with an external compression engine.")
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}
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@@ -91,6 +93,20 @@ func getExtensionFromEngine(engine string) (string, error) {
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return "", fmt.Errorf("%w %q", errUnsupportedCompressionEngine, engine)
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}
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+// resolveExternalDecompressor returns the external decompressor command to use
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+// at restore time. The CLI flag (--external-decompressor) takes precedence. The
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+// backup manifest value is only used when --external-decompressor-use-manifest
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+// is explicitly set to true.
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+func resolveExternalDecompressor(manifestDecompressor string) string {
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+ if ExternalDecompressorCmd != "" {
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+ return ExternalDecompressorCmd
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+ }
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+ if ExternalDecompressorUseManifest && manifestDecompressor != "" {
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+ return manifestDecompressor
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+ }
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+ return ""
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+}
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+
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// Validates if the external decompressor exists and return its path.
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func validateExternalCmd(cmd string) (string, error) {
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if cmd == "" {
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diff --git a/go/vt/mysqlctl/compression_external_decompressor_test.go b/go/vt/mysqlctl/compression_external_decompressor_test.go
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new file mode 100644
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index 0000000..fd4732a
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--- /dev/null
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+++ b/go/vt/mysqlctl/compression_external_decompressor_test.go
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@@ -0,0 +1,93 @@
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+/*
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+Copyright 2026 The Vitess Authors.
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+
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+Licensed under the Apache License, Version 2.0 (the "License");
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+you may not use this file except in compliance with the License.
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+You may obtain a copy of the License at
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+
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+ http://www.apache.org/licenses/LICENSE-2.0
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+
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+Unless required by applicable law or agreed to in writing, software
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+distributed under the License is distributed on an "AS IS" BASIS,
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+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+See the License for the specific language governing permissions and
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+limitations under the License.
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+*/
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+
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+package mysqlctl
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+
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+import (
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+ "testing"
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+
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+ "github.com/stretchr/testify/assert"
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+)
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+
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+func TestResolveExternalDecompressor(t *testing.T) {
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+ tests := []struct {
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+ name string
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+ cliDecompressorCmd string
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+ useManifest bool
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+ manifestDecompressor string
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+ expected string
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+ }{
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+ {
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+ name: "CLI flag takes precedence over manifest",
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+ cliDecompressorCmd: "zstd -d",
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+ useManifest: true,
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+ manifestDecompressor: "gzip -d",
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+ expected: "zstd -d",
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+ },
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+ {
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+ name: "CLI flag takes precedence even when use-manifest is false",
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+ cliDecompressorCmd: "zstd -d",
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+ useManifest: false,
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+ manifestDecompressor: "gzip -d",
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+ expected: "zstd -d",
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+ },
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+ {
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+ name: "manifest used when use-manifest is true and no CLI flag",
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+ cliDecompressorCmd: "",
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+ useManifest: true,
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+ manifestDecompressor: "gzip -d",
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+ expected: "gzip -d",
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+ },
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+ {
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+ name: "manifest ignored when use-manifest is false",
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+ cliDecompressorCmd: "",
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+ useManifest: false,
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+ manifestDecompressor: "gzip -d",
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+ expected: "",
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+ },
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+ {
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+ name: "empty when nothing is set",
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+ cliDecompressorCmd: "",
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+ useManifest: false,
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+ manifestDecompressor: "",
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+ expected: "",
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+ },
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+ {
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+ name: "empty when use-manifest is true but manifest is empty",
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+ cliDecompressorCmd: "",
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+ useManifest: true,
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+ manifestDecompressor: "",
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+ expected: "",
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+ },
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+ }
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+
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+ for _, tt := range tests {
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+ t.Run(tt.name, func(t *testing.T) {
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+ origCmd := ExternalDecompressorCmd
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+ origAllow := ExternalDecompressorUseManifest
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+ t.Cleanup(func() {
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+ ExternalDecompressorCmd = origCmd
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+ ExternalDecompressorUseManifest = origAllow
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+ })
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+
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+ ExternalDecompressorCmd = tt.cliDecompressorCmd
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+ ExternalDecompressorUseManifest = tt.useManifest
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+
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+ result := resolveExternalDecompressor(tt.manifestDecompressor)
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+ assert.Equal(t, tt.expected, result)
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+ })
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+ }
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+}
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diff --git a/go/vt/mysqlctl/xtrabackupengine.go b/go/vt/mysqlctl/xtrabackupengine.go
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index 6b3d04c..5976a93 100644
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--- a/go/vt/mysqlctl/xtrabackupengine.go
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+++ b/go/vt/mysqlctl/xtrabackupengine.go
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@@ -637,10 +637,7 @@ func (be *XtrabackupEngine) extractFiles(ctx context.Context, logger logutil.Log
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// then we assign the default value of compressionEngine.
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deCompressionEngine = PgzipCompressor
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}
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- externalDecompressorCmd := ExternalDecompressorCmd
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- if externalDecompressorCmd == "" && bm.ExternalDecompressor != "" {
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- externalDecompressorCmd = bm.ExternalDecompressor
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- }
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+ externalDecompressorCmd := resolveExternalDecompressor(bm.ExternalDecompressor)
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if externalDecompressorCmd != "" {
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if deCompressionEngine == ExternalCompressor {
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deCompressionEngine = externalDecompressorCmd
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--
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2.43.0
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