CVEvulnerability

CVE-2026-57585

7.5 HIGH Published 2026-06-30 Modified 2026-10-25 Official page ↗

Status: Analyzed
Published: 2026-06-30
Last modified: 2026-10-25
Assigner: [email protected]
CVSS 3.1 ([email protected]): 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses: CWE-416

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.

Affected configurations

• msgpack messagepack (< 1.2.1)

Weakness · CWE (1)

CWE-416 Use After Free weakness

References

https://github.com/msgpack/msgpack-python/commit/2c56ddb5d0025ed481d962c0f5d62d19dec7476d Patch
https://github.com/msgpack/msgpack-python/security/advisories/GHSA-6v7p-g79w-8964 Mitigation, Vendor Advisory

CVE-2026-57585

Description

Affected configurations

Related

Weakness · CWE (1)

References