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CVE-2026-114613

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.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Msgpack
Products
Msgpack-python
CVE-2026-57585

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.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Msgpack
Products
Messagepack Msgpack-python