Detections
Analytics

Echo: expat: security update to 2.8.4-1

high Tenable Self-Hosted Container Security Plugin ID 458247

Description

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

 - Expat through 2.8.3 contains an out-of-bounds read vulnerability that allows attackers to trigger memory
 corruption by processing XML with external entity parsers created via XML_ExternalEntityParserCreate. A
 struct size mismatch between ELEMENT_TYPE members causes storeAtts to read the attIndex member past
 allocated memory boundaries, resulting in failure to normalize whitespace in non-CDATA attributes or a
 wild pointer dereference causing a segfault. This vulnerability was introduced by the fix for
 CVE-2026-66046. (CVE-2026-76641)

Solution

Update the expat library and its related packages to version 2.8.4-1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-76641

Plugin Details

Severity: High

ID: 458247

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.76

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-2026-76641

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: 8.7

Threat Score: 6.6

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/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: 8/23/2026

Vulnerability Publication Date: 8/20/2026

Reference Information

CVE: CVE-2026-76641

IAVA: 2026-A-0925-S