CVE-2026-57585
HIGH
NVD
CVSS Score
7.5
Severity
HIGH
Published
Jun 30, 2026
Vendor
unknown
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.