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advisory-database[bot]advisory-database[bot]
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Publish Advisories
GHSA-jxxm-27vp-c3m5 GHSA-vprv-35vv-q339
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‎advisories/github-reviewed/2026/03/GHSA-jxxm-27vp-c3m5/GHSA-jxxm-27vp-c3m5.json‎

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{
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"schema_version": "1.4.0",
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"id": "GHSA-jxxm-27vp-c3m5",
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"modified": "2026-03-24T21:45:03Z",
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"published": "2026-03-24T21:44:17Z",
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"aliases": [
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"CVE-2026-33217"
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],
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"summary": "NATS allows MQTT clients to bypass ACL checks",
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"details": "### Background\n\nNATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.\n\nThe nats-server provides an MQTT client interface.\n\n### Problem Description\n\nWhen using ACLs on message subjects, these ACLs were not applied in the `$MQTT.>` namespace, allowing MQTT clients to bypass ACL checks for MQTT subjects.\n\n### Affected Versions\n\nAny version before v2.12.6 or v2.11.15\n\n### Workarounds\n\nNone.",
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"severity": [
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{
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"type": "CVSS_V3",
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"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N"
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}
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],
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"affected": [
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{
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"package": {
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"ecosystem": "Go",
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"name": "github.com/nats-io/nats-server/v2"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0"
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},
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{
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"fixed": "2.11.15"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Go",
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"name": "github.com/nats-io/nats-server/v2"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "2.12.0-RC.1"
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},
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{
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"fixed": "2.12.6"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"type": "WEB",
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"url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-jxxm-27vp-c3m5"
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},
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{
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"type": "WEB",
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"url": "https://advisories.nats.io/CVE/secnote-2026-07.txt"
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},
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{
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"type": "PACKAGE",
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"url": "https://github.com/nats-io/nats-server"
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}
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],
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"database_specific": {
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"cwe_ids": [
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"CWE-863"
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],
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"severity": "HIGH",
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"github_reviewed": true,
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"github_reviewed_at": "2026-03-24T21:44:17Z",
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"nvd_published_at": null
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}
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}

‎advisories/github-reviewed/2026/03/GHSA-vprv-35vv-q339/GHSA-vprv-35vv-q339.json‎

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{
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"schema_version": "1.4.0",
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"id": "GHSA-vprv-35vv-q339",
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"modified": "2026-03-24T21:45:29Z",
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"published": "2026-03-24T21:45:29Z",
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"aliases": [
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"CVE-2026-33218"
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],
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"summary": "NATS has pre-auth server panic via leafnode handling",
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"details": "### Background\n\nNATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.\n\nThe nats-server allows hub/spoke topologies using \"leafnode\" connections by other nats-servers.\n\n### Problem Description\n\nA client which can connect to the leafnode port can crash the nats-server with a certain malformed message pre-authentication.\n\n### Affected Versions\n\nAny version before v2.12.6 or v2.11.15\n\n### Workarounds\n\n1. Disable leafnode support if not needed.\n2. Restrict network connections to your leafnode port, if plausible without compromising the service offered.\n\n### References\n\n * This document is canonically: <https://advisories.nats.io/CVE/secnote-2026-10.txt>\n * GHSA advisory: <https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339>\n * MITRE CVE entry: <https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33218>",
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"severity": [
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{
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"type": "CVSS_V3",
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"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
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}
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],
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"affected": [
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{
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"package": {
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"ecosystem": "Go",
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"name": "github.com/nats-io/nats-server/v2"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "0"
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},
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{
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"fixed": "2.11.15"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Go",
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"name": "github.com/nats-io/nats-server/v2"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "2.12.0-RC.1"
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},
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{
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"fixed": "2.12.6"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"type": "WEB",
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"url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339"
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},
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{
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"type": "WEB",
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"url": "https://advisories.nats.io/CVE/secnote-2026-10.txt"
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},
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{
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"type": "PACKAGE",
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"url": "https://github.com/nats-io/nats-server"
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}
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],
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"database_specific": {
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"cwe_ids": [
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"CWE-20"
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],
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"severity": "HIGH",
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"github_reviewed": true,
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"github_reviewed_at": "2026-03-24T21:45:29Z",
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"nvd_published_at": null
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}
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}

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