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CVE-2026-114613

7.5 high SSVC exploitation: none Published
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 4

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-23 21:08
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-23 19:42
  3. StatusReceived → PublishedNVD modified 2026-10-22 18:22
  4. First seenCVSS 7.5NVD modified 2026-10-22 19:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 3