CVE-2026-114613

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Source
https://cve.org/CVERecord?id=CVE-2026-114613
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-114613.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-114613
Aliases
  • GHSA-j586-36cw-2gc2
Published
2026-10-22T18:22:40Z
Modified
2026-10-23T10:45:21Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
MessagePack: Unbounded memory leak in msgpack C extension on strict_map_key validation failure
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-401"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114613.json"
}
References

Affected packages

Git / github.com/msgpack/msgpack-python

Affected ranges

Type
GIT
Repo
https://github.com/msgpack/msgpack-python
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
742cb6d7ad141343edcccc829b5b06d0c6f8fcb5
Fixed
620b0eb4c89cd72d4098564537624d9dbb2ce141
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.2.3"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "620b0eb4c89cd72d4098564537624d9dbb2ce141"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v1.2.3",
            "range":  [
                {
                    "fixed":  "742cb6d7ad141343edcccc829b5b06d0c6f8fcb5"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

0.*
0.1.10
0.1.11
0.1.12
0.1.13
0.2.0
0.2.1
0.2.2
0.3.0
0.4.0
0.4.1
0.4.2
0.4.3
0.4.4
0.4.6
0.4.7
0.5.0
0.5.1
0.5.2
0.5.4
0.5.5
0.5.6
v0.*
v0.6.0
v0.6.1
v0.6.2
v1.*
v1.0.0
v1.0.0rc1
v1.0.1
v1.0.2
v1.0.3
v1.0.3rc1
v1.0.4
v1.0.4rc1
v1.0.5
v1.0.5rc1
v1.0.6
v1.0.6rc1
v1.0.7
v1.0.8
v1.1.0
v1.1.0rc1
v1.1.0rc2
v1.1.1
v1.1.1rc1
v1.1.2
v1.2.0
v1.2.0rc1
v1.2.1
v1.2.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-114613.json"