chore(deps): update dependency protobuf to v5.29.6 [security] - autoclosed

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
protobuf	==5.29.4 → ==5.29.6
protobuf	==5.29.5 → ==5.29.6
protobuf	==4.25.6 → ==5.29.6
protobuf	==4.25.8 → ==5.29.6

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protobuf-python has a potential Denial of Service issue

CVE-2025-4565 / GHSA-8qvm-5x2c-j2w7

More information

Details

Summary

Any project that uses Protobuf pure-Python backend to parse untrusted Protocol Buffers data containing an arbitrary number of recursive groups, recursive messages or a series of SGROUP tags can be corrupted by exceeding the Python recursion limit.

Reporter: Alexis Challande, Trail of Bits Ecosystem Security Team
ecosystem@trailofbits.com

Affected versions: This issue only affects the pure-Python implementation of protobuf-python backend. This is the implementation when PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python environment variable is set or the default when protobuf is used from Bazel or pure-Python PyPi wheels. CPython PyPi wheels do not use pure-Python by default.

This is a Python variant of a previous issue affecting protobuf-java.

Severity

This is a potential Denial of Service. Parsing nested protobuf data creates unbounded recursions that can be abused by an attacker.

Proof of Concept

For reproduction details, please refer to the unit tests decoder_test.py and message_test

Remediation and Mitigation

A mitigation is available now. Please update to the latest available versions of the following packages:

• protobuf-python(4.25.8, 5.29.5, 6.31.1)

Severity

• CVSS Score: 8.2 / 10 (High)
• Vector String: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

• https://github.com/protocolbuffers/protobuf/security/advisories/GHSA-735f-pc8j-v9w8
• https://github.com/protocolbuffers/protobuf/security/advisories/GHSA-8qvm-5x2c-j2w7
• https://nvd.nist.gov/vuln/detail/CVE-2025-4565
• https://github.com/protocolbuffers/protobuf/commit/17838beda2943d08b8a9d4df5b68f5f04f26d901
• https://github.com/protocolbuffers/protobuf/blob/main/python/google/protobuf/internal/decoder_test.py#L87-L98
• https://github.com/protocolbuffers/protobuf/blob/main/python/google/protobuf/internal/message_test.py#L1436-L1478
• https://github.com/protocolbuffers/protobuf/tree/main/python#implementation-backends
• https://github.com/advisories/GHSA-8qvm-5x2c-j2w7

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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protobuf affected by a JSON recursion depth bypass

CVE-2026-0994 / GHSA-7gcm-g887-7qv7

More information

Details

A denial-of-service (DoS) vulnerability exists in google.protobuf.json_format.ParseDict() in Python, where the max_recursion_depth limit can be bypassed when parsing nested google.protobuf.Any messages.

Due to missing recursion depth accounting inside the internal Any-handling logic, an attacker can supply deeply nested Any structures that bypass the intended recursion limit, eventually exhausting Python’s recursion stack and causing a RecursionError.

Severity

• CVSS Score: 8.2 / 10 (High)
• Vector String: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L

References

• https://nvd.nist.gov/vuln/detail/CVE-2026-0994
• https://github.com/protocolbuffers/protobuf/pull/25239
• https://github.com/protocolbuffers/protobuf/issues/25070
• https://github.com/protocolbuffers/protobuf/commit/d2b001626d137c62dfee6c88c87324102531868b
• https://github.com/protocolbuffers/protobuf/commit/5ebddcb1bcbe51d1fe323baa145e85f4f23128cf
• https://github.com/advisories/GHSA-7gcm-g887-7qv7

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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[gemini-code-assist]

Code Review

This pull request updates the protobuf dependency to version 5.29.6 across several requirements.txt files to address security vulnerabilities. However, the reviewer identified that this update introduces dependency conflicts in several Cloud Functions modules where google-api-core is pinned to version 2.17.1, which is incompatible with protobuf 5.x. To resolve this, it is recommended to either use the patched 4.x version (protobuf==4.25.9) or upgrade google-api-core to version 2.19.0 or higher.

[gemini-code-assist]

Upgrading to protobuf==5.29.6 (part of the 5.x major version) introduces a dependency conflict with google-api-core==2.17.1, which constrains protobuf to < 5.0.0dev. To maintain compatibility while addressing the security vulnerabilities (CVE-2025-4565 and CVE-2026-0994), it is recommended to use protobuf==4.25.9, which is the patched version in the 4.x branch. Alternatively, google-api-core would need to be upgraded to 2.19.0 or higher.

protobuf==4.25.9

[gemini-code-assist]

Upgrading to protobuf==5.29.6 (part of the 5.x major version) introduces a dependency conflict with google-api-core==2.17.1, which constrains protobuf to < 5.0.0dev. To maintain compatibility while addressing the security vulnerabilities (CVE-2025-4565 and CVE-2026-0994), it is recommended to use protobuf==4.25.9, which is the patched version in the 4.x branch. Alternatively, google-api-core would need to be upgraded to 2.19.0 or higher.

protobuf==4.25.9

[gemini-code-assist]

Upgrading to protobuf==5.29.6 (part of the 5.x major version) introduces a dependency conflict with google-api-core==2.17.1, which constrains protobuf to < 5.0.0dev. To maintain compatibility while addressing the security vulnerabilities (CVE-2025-4565 and CVE-2026-0994), it is recommended to use protobuf==4.25.9, which is the patched version in the 4.x branch. Alternatively, google-api-core would need to be upgraded to 2.19.0 or higher.

protobuf==4.25.9