CVE-2026-0994
HIGH7.5EPSS 0.01%protobuf affected by a JSON recursion depth bypass
Published: 1/23/2026Modified: 5/11/2026
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.
Affected packages (2)
- Debian/protobuffrom 0
- PyPI/protobuf>= 6.30.0rc1, < 6.33.5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References (7)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-0994
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-0994
- PATCHhttps://github.com/protocolbuffers/protobuf
- WEBhttps://github.com/protocolbuffers/protobuf/commit/5ebddcb1bcbe51d1fe323baa145e85f4f23128cf
- WEBhttps://github.com/protocolbuffers/protobuf/commit/d2b001626d137c62dfee6c88c87324102531868b
- WEBhttps://github.com/protocolbuffers/protobuf/issues/25070
- WEBhttps://github.com/protocolbuffers/protobuf/pull/25239