Detections
Analytics
SCA: security update for MessagePack (GHSA-cxmj-83gh-fp49)
medium Tenable Cloud Security Plugin ID 443956
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, MessagePack-CSharp's
multi-dimensional array formatters read dimension lengths directly from the payload and allocate T[,],
T[,,], or T[,,,] before validating that the dimension product matches the encoded element count. The
formatter reads a guarded element array header, but allocation of the target multi-dimensional array
happens before the dimensions are checked against that element count. A small payload can therefore
declare large dimensions, provide an empty or tiny inner array, and cause a large heap allocation before
element data is validated. This vulnerability is fixed in 2.5.301 and 3.1.7. (CVE-2026-48515)
Solution
Update the MessagePack library and its related packages to version 2.5.301 or later.See Also
Plugin Details
Severity: Medium
ID: 443956
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-2026-48515
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-2026-48515
cwe: CWE-770