What’s Vulnerable › Vulnerabilities
CVE-2026-0994: Denial of Service in Python Protobuf
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.7% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-01-23 · updated 2026-09-01
- Weakness: CWE-674
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 products
- Python Protobuf: through 33.4
References
- https://github.com/protocolbuffers/protobuf/pull/25239
- https://access.redhat.com/errata/RHSA-2026:16174
- https://access.redhat.com/errata/RHSA-2026:3059
- https://access.redhat.com/errata/RHSA-2026:3094
- https://access.redhat.com/errata/RHSA-2026:3095
- https://access.redhat.com/errata/RHSA-2026:3097
- https://access.redhat.com/errata/RHSA-2026:3218
- https://access.redhat.com/errata/RHSA-2026:3219
- https://access.redhat.com/errata/RHSA-2026:3220
- https://access.redhat.com/errata/RHSA-2026:3461
- https://access.redhat.com/errata/RHSA-2026:3462
- https://access.redhat.com/errata/RHSA-2026:3958
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