CVE-2025-4565
Medium
Description
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
SeverityMedium
CVSS5.3
Exploit probability—
Product
Protobuf
PublishedJun 16, 2025
First seenJun 16, 2025
Weakness typeCWE-674CWE-674
How to fix
Update
- protobuf4.25.8, 5.29.5, 6.31.1 or later
- google protobuf-python4.25.8, 5.29.5, 6.31.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| protobufPyPI | v < 4.25.8, 5.26.0rc1 ≤ v < 5.29.5, 6.30.0rc1 ≤ v < 6.31.1 | 4.25.8, 5.29.5, 6.31.1 |
| google protobuf-python | v < 4.25.8, 5.26.0 ≤ v < 5.29.5, 6.30.0 ≤ v < 6.31.1 | 4.25.8, 5.29.5, 6.31.1 |
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