Detections
Analytics

SCA: security update for MessagePack (GHSA-w567-gjr2-hm5j)

medium Tenable Self-Hosted Container Security Plugin ID 443958

Description

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

 - MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.301 and 3.1.7,
 UnsafeBlitFormatterBase<T>.Deserialize reads an attacker-controlled byteLength from an extension payload
 and allocates an array based on that value before validating it against the extension header length or
 remaining payload bytes. The outer extension header is bounded by available input, but that bound is not
 used to constrain the inner byteLength before allocation. A very small payload can therefore request a
 very large T[] allocation. This vulnerability is fixed in 2.5.301 and 3.1.7. (CVE-2026-48514)

Solution

Update the MessagePack library and its related packages to version 2.5.301 or later.

See Also

https://github.com/advisories/GHSA-w567-gjr2-hm5j

Plugin Details

Severity: Medium

ID: 443958

Version: Revision 1.2

Type: Local

Family: SCA Checks

Published: 6/26/2026

Updated: 7/6/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.73

Vendor

Vendor Severity: Medium

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-2026-48514

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

CVSS v4

Risk Factor: Medium

Base Score: 6.3

Threat Score: 1.7

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/25/2026

Vulnerability Publication Date: 6/22/2026

Reference Information

CVE: CVE-2026-48514

cwe: CWE-770