CVE-2025-4565 - CVE House
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Status published High CVE-2025-4565

Unbounded recursion in Python Protobuf

Vulnerability 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

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Alexis Challande - Trail of Bits Ecosystem Security Team

References

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CVE-2024-2410
Use after free in C++ protobuf
High 7.6

Affected Vendor

protocolbuffers

View all reports →

Affected Software

Python-Protobuf
Vulnerable Versions:
0

Timeline

Official Publish: June 16th, 2025
Last Modified: June 16th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

Weaknesses (CWE)

CWE-674

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.