GitHub Advisoryadvisory · PyPI
GHSA-7gcm-g887-7qv7 protobuf affected by a JSON recursion depth bypass
HIGH
Official page ↗
- Aliases
- CVE-2026-0994
- Ecosystem
- PyPI
- Packages
- protobuf
- Severity
- High
- CVSS vector
- 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
- Weaknesses
- CWE-674
- Reviewed
- 2026-01-23
Affected packages
• PyPI protobuf: >= 6.30.0rc1, < 6.33.5 → fixed in 6.33.5
• PyPI protobuf: < 5.29.6 → fixed in 5.29.6
Description
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.
Related
Alias · CVE (1)
- CVE-2026-0994 A denial-of-service (DoS) vulnerability exists in google.protobuf.json_format.ParseDict() in Python, where the max_recursion_depth limit… vulnerability
Weakness · CWE (1)
- CWE-674 Uncontrolled Recursion weakness
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