VULNERABILITY INTELLIGENCE

CVE-2026-57585

CVSS score7.5 HIGH
EPSS probability0.49%
CISA KEVNot currently listed
Published2026-06-30
Last modified2026-10-25
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Weakness classification

  • CWE-416: Use After Free

Primary references