CVE-2026-114613

Açıklama (NVD)

MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.3, the msgpack-python C extension (msgpack._cmsgpack) leaks a decoded map value when deserialization rejects a key with strict_map_key=True (the default). Repeated malformed inputs can cause unbounded process memory growth and denial of service in applications that deserialize attacker-controlled MessagePack data. Both unpackb() and the streaming Unpacker API are affected. The pure-Python fallback does not exhibit this leak in the reported tests. This issue is fixed in version 1.2.3.

Yayın: 22.10.2026 · Son değişiklik: 24.10.2026 · Zayıflık: CWE-401

CVSS 3.1 metrikleri

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

Hesaplanan temel puan: 7.5. CVSS hesaplayıcıda incele

Referanslar

• https://github.com/msgpack/msgpack-python/commit/620b0eb4c89cd72d4098564537624d9dbb2ce141
• https://github.com/msgpack/msgpack-python/releases/tag/v1.2.3
• https://github.com/msgpack/msgpack-python/security/advisories/GHSA-j586-36cw-2gc2