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PYSEC-2026-1805
protobuf affected by a JSON recursion depth bypass
Quick fix
PYSEC-2026-1805 — protobuf: upgrade to the fixed version with the command below.
pip install --upgrade 'protobuf>=5.29.6'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.
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-0994[ADVISORY]
- https://github.com/protocolbuffers/protobuf/issues/25070[WEB]
- https://github.com/protocolbuffers/protobuf/pull/25239[WEB]
- https://github.com/protocolbuffers/protobuf/commit/5ebddcb1bcbe51d1fe323baa145e85f4f23128cf[WEB]
- https://github.com/protocolbuffers/protobuf/commit/d2b001626d137c62dfee6c88c87324102531868b[WEB]
- https://github.com/protocolbuffers/protobuf[PACKAGE]
- https://pypi.org/project/protobuf[PACKAGE]
- https://github.com/advisories/GHSA-7gcm-g887-7qv7[ADVISORY]