Detections
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SCA: security update for msgpack (GHSA-j586-36cw-2gc2)

high Tenable Cloud Security Plugin ID 477645

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2026-114613)

Solution

Update the msgpack library and its related packages to version 1.2.3 or later.

See Also

https://github.com/advisories/GHSA-j586-36cw-2gc2

Plugin Details

Severity: High

ID: 477645

Version: Revision 1.1

Type: Local

Family: SCA Checks

Published: 10/27/2026

Updated: 10/27/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.72

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-114613

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 10/27/2026

Vulnerability Publication Date: 10/22/2026

Reference Information

CVE: CVE-2026-114613