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SCA: security update for MessagePack (GHSA-vh6j-jc39-fggf)

high Tenable Self-Hosted Container Security Plugin ID 443971

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,
 MessagePackReader.TrySkip() recursively descends into nested arrays and maps without incrementing the
 reader depth or calling the configured depth checks. This bypasses
 MessagePackSecurity.MaximumObjectGraphDepth, the library's documented protection against deeply nested
 object graphs. Many generated and dynamic formatters call reader.Skip() when they encounter unknown map
 keys, unknown array members, ignored fields, or data that should be skipped for forward compatibility. A
 deeply nested value in one of these skipped positions can therefore cause unbounded recursion and an
 uncatchable StackOverflowException. This vulnerability is fixed in 2.5.301 and 3.1.7. (CVE-2026-48506)

Solution

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

See Also

https://github.com/advisories/GHSA-vh6j-jc39-fggf

Plugin Details

Severity: High

ID: 443971

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: 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-2026-48506

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: 6/25/2026

Vulnerability Publication Date: 6/22/2026

Reference Information

CVE: CVE-2026-48506

cwe: CWE-674