Detections
Analytics

SCA: security update for msgpack (GHSA-4mrv-5p47-p938)

low Tenable Cloud Security Plugin ID 445493

Description

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

 - MessagePack for Ruby is an implementation of the MessagePack binary serialization format. Prior to 1.8.2,
 MessagePack::Buffer#clear in ext/msgpack/buffer.c leaves rmem_last, rmem_end, and rmem_owner stale after
 _msgpack_buffer_shift_chunk returns an rmem page to the shared pool, allowing a subsequent Buffer#write
 and a second MessagePack::Buffer to alias the page and disclose or corrupt cross-buffer data. This issue
 is fixed in version 1.8.2. (CVE-2026-54522)

Solution

Update the msgpack library and its related packages to version 1.8.2 or later.

See Also

https://github.com/advisories/GHSA-4mrv-5p47-p938

Plugin Details

Severity: Low

ID: 445493

Version: Revision 1.2

Type: Local

Family: SCA Checks

Published: 7/30/2026

Updated: 7/31/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.13

Vendor

Vendor Severity: Low

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

CVSS Score Source: CVE-2026-54522

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

CVSS v4

Risk Factor: Low

Base Score: 2.1

Threat Score: 0.5

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 7/30/2026

Vulnerability Publication Date: 7/30/2026

Reference Information

CVE: CVE-2026-54522

cwe: CWE-416