HIGH 7.5

PYSEC-2026-3625

Quick fix

PYSEC-2026-3625 — msgpack: upgrade to the fixed version with the command below.

pip install --upgrade 'msgpack>=1.2.1'

Details

MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.1, there is an Out-of-bounds read/crash on Unpacker reuse after a caught error, potentially leading to a DoS attack. If the Unpacker is used repeatedly after an error occurs, the process may crash with a SEGV. This issue has been fixed in version 1.2.1.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI / msgpack

Introduced in: 0 Fixed in: 1.2.1

Fix pip install --upgrade 'msgpack>=1.2.1'

References

https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-8964 [ADVISORY]
https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d [FIX]