Detections
Analytics

SCA: security update for MessagePack (GHSA-v72x-2h86-7f8m)

medium Tenable Cloud Security Plugin ID 443986

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, when MessagePack-CSharp
 decompresses Lz4Block or Lz4BlockArray payloads, it reads declared uncompressed lengths from the wire and
 allocates output buffers based on those lengths before validating that the compressed data is valid or
 that the declared expansion is reasonable. A small payload can claim a very large uncompressed length and
 force a large allocation before LZ4 decoding begins. This vulnerability is fixed in 2.5.301 and 3.1.7.
 (CVE-2026-48510)

Solution

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

See Also

https://github.com/advisories/GHSA-v72x-2h86-7f8m

Plugin Details

Severity: Medium

ID: 443986

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-2026-48510

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-2026-48510