CVSS 4.0
8.2 highCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NCVE-2025-4565
High (8.2) in google protobuf-python. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in protobuf 4.25.8, 5.29.5, 6.31.1.
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. This can result in a Denial of service by crashing the application with a RecursionError. We recommend upgrading to version =>6.31.1 or beyond commit 17838beda2943d08b8a9d4df5b68f5f04f26d901
Severity
CVSS 3.1
5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 17% of CVEs (scores of 2026-10-31)
- CWE
- CWE-674
- Published
- Modified
- Record from
- the NVD, synced
Affected
- google:protobuf-python
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-8qvm-5x2c-j2w7 | PyPI | protobuf | <4.25.8 | 4.25.8 |
| GHSA-8qvm-5x2c-j2w7 | PyPI | protobuf | >=5.26.0rc1 <5.29.5 | 5.29.5 |
| GHSA-8qvm-5x2c-j2w7 | PyPI | protobuf | >=6.30.0rc1 <6.31.1 | 6.31.1 |
| PYSEC-2026-1806 | PyPI | protobuf | <4.25.8 >=5.26.0rc1 <5.29.5 >=6.30.0rc1 <6.31.1 | 4.25.8, 5.29.5, 6.31.1 |