Detections
Analytics
SCA: security update for MessagePack (GHSA-382j-8mxh-c7x2)
high Tenable Self-Hosted Container Security Plugin ID 443930
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.ReadDateTime() can allocate stack memory based on an attacker-controlled MessagePack
extension length. In the slow path for timestamp extension parsing, the computed tokenSize includes the
extension body length from the wire and is used in a stackalloc operation before the extension length is
validated as one of the valid timestamp sizes. A very small payload can claim a large timestamp extension
body and cause a stack allocation large enough to trigger an uncatchable StackOverflowException,
terminating the host process. This vulnerability is fixed in 2.5.301 and 3.1.7. (CVE-2026-48502)
Solution
Update the MessagePack library and its related packages to version 3.1.7 or later.See Also
Plugin Details
Severity: High
ID: 443930
Version: Revision 1.2
Type: Local
Family: SCA Checks
Published: 6/25/2026
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-2026-48502
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: High
Base Score: 8.2
Threat Score: 4.6
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:H/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-2026-48502