CVE-2026-114613

7.5 Élevée

Publiée le 22/10/2026 à 21:17 · Modifiée le 22/10/2026 à 21:17 · Reçue · Source : security-advisories@github.com

Description

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.

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Produits concernés

msgpack-python

Scores CVSS

Version	Score	Source	Vecteur
3.1	7.5 Élevée	security-advisories@github.com	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

Faiblesses (CWE)

CWE-401

Références

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

Ailleurs

NVD
CVE.org
CIRCL Vulnerability-Lookup
CERT-FR
GitHub Advisories