CVE-2026-114613

Published: Ott 22, 2026 Last Modified: Ott 22, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,5
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high

Description

AI Translation Available

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.

401

Missing Release of Memory after Effective Lifetime

Draft
Abstraction: Variant Structure: Simple
Common Consequences
Security Scopes Affected:
Availability Other
Potential Impacts:
Dos: Crash, Exit, Or Restart Dos: Instability Dos: Resource Consumption (Cpu) Dos: Resource Consumption (Memory) Reduce Performance
Applicable Platforms
Languages: Not Language-Specific, C, C++
Likelihood of Exploit: Medium
View CWE Details
https://github.com/msgpack/msgpack-python/commit/620b0eb4c8…
https://github.com/msgpack/msgpack-python/commit/620b0eb4c89cd72d4098564537624d…
https://github.com/msgpack/msgpack-python/releases/tag/v1.2…
https://github.com/msgpack/msgpack-python/releases/tag/v1.2.3
https://github.com/msgpack/msgpack-python/security/advisori…
https://github.com/msgpack/msgpack-python/security/advisories/GHSA-j586-36cw-2g…