CVE-2024-2410: Use after free in C++ protobuf

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-03 · updated 2026-06-17
Weakness: CWE-416

Description

The JsonToBinaryStream() function is part of the protocol buffers C++ implementation and is used to parse JSON from a stream. If the input is broken up into separate chunks in a certain way, the parser will attempt to read bytes from a chunk that has already been freed.

Affected products

Python Protobuf: from 4.22.0 before 4.25.0 — fixed in 4.25.0

How to fix

Upgrade to a fixed version: Python Protobuf 4.25.0. Check the vendor advisory for mitigations.

References

https://github.com/protocolbuffers/protobuf/releases/tag/v25.0
https://github.com/protocolbuffers/protobuf/releases/tag/v25.0

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