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python-msgpack vulnerabilities

Vulnerabilities published for python-msgpack in the last 30 days: 1. Listed in the KEV catalogue: 0.

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Vulnerabilities: 2

  1. CVE-2026-114613

    High · CVSS 7.5EPSS 0.34%No fix published

    MessagePack: Unbounded memory leak in msgpack C extension on strict_map_key validation failure

    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.

    python-msgpackOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

  2. CVE-2026-57585

    High · CVSS 7.5EPSS 0.49%No fix published

    MessagePack: Out-of-bounds read/crash on Unpacker reuse after caught error

    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.

    python-msgpackOperating systems
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

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