{"id":"ghsa-ghsa-j586-36cw-2gc2","seq":1708815,"kind":"advisory","title":"MessagePack: Unbounded memory leak in msgpack C extension on strict_map_key validation failure","url":"https://github.com/advisories/GHSA-j586-36cw-2gc2","permalink":"https://vulnpulse.app/items/ghsa-ghsa-j586-36cw-2gc2","summary":"影響: pip:msgpack < 1.2.3 → 1.2.3\nThe 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. The report measured approximately 4 MiB retained pe…","severity":"high","techs":["python"],"cves":["CVE-2026-114613"],"tags":["GHSA-j586-36cw-2gc2","msgpack"],"source":{"id":"ghsa","name":"GitHub Advisory Database"},"published_at":"2026-10-27T15:04:07.000Z","fetched_at":"2026-10-27T21:03:52.214Z"}