CVE-2026-57585

HighCVSS 7.5/10Last modified Oct 25, 2026

Description

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-416

Affected software

Vendor	Product	Versions
msgpack	msgpack-python	< 1.2.1

References

https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476dPatch
https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-8964Mitigation, Vendor Advisory

Timeline

Published: Jun 30, 2026
Last modified: Oct 25, 2026
NVD status: Analyzed

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