fix(deps): Update dependency protobuf to v6.33.5 [SECURITY] - abandoned

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
protobuf	==6.30.0 → ==6.33.5
protobuf	==5.27.2 → ==6.33.5

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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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[dpebot]

/gcbrun

[gemini-code-assist]

Code Review

This pull request updates the protobuf dependency to version 6.33.5 across multiple requirements.txt files. A review comment identifies that the source requirements.in file for the american-option module still pins the older version, which will cause this update to be lost during the next dependency compilation. Additionally, the reviewer notes a potential compatibility issue between the new protobuf version and the current grpcio-tools version, suggesting that both should be updated in tandem or a different version of protobuf should be selected to ensure stability.

[gemini-code-assist]

The requirements.in file for this module still pins protobuf==5.27.2 (line 19). Since requirements.txt is autogenerated from it, this security update will be lost upon the next re-compilation. Furthermore, the comment in requirements.in (line 17) states that protobuf and grpcio-tools must be kept in sync. Upgrading to 6.33.5 while keeping grpcio-tools at 1.66.1 may lead to compatibility issues. Consider updating both in requirements.in to their latest versions (e.g., grpcio-tools==1.70.0 and protobuf==6.33.5), or if a major version jump is not desired, update protobuf to 5.29.5 which also contains the security fixes.

[dpebot]

/gcbrun

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