CVE-2025-4565

Unbounded recursion in Python Protobuf

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

Category

8.2
CVSS
Severity: High
CVSS 4.0 •
EPSS 0.04%
Affected: protocolbuffers Python-Protobuf
Affected: protocolbuffers Python-Protobuf
Published at:
Updated at:

References

Link Tags
https://github.com/protocolbuffers/protobuf/commit/17838beda2943d08b8a9d4df5b68f5f04f26d901

Frequently Asked Questions

What is the severity of CVE-2025-4565?
CVE-2025-4565 has been scored as a high severity vulnerability.
How to fix CVE-2025-4565?
To fix CVE-2025-4565, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-4565 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-4565 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-4565?
CVE-2025-4565 affects protocolbuffers Python-Protobuf, protocolbuffers Python-Protobuf.
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