Detections
Analytics

Echo: expat: security update to 2.8.4-1

high Tenable Self-Hosted Container Security Plugin ID 462786

Description

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

 - Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity
 in the storeAtts() function in xmlparse.c, where processing N specified attributes with non-normalized
 values triggers an O(N^2) linear scan of elementType->defaultAtts to determine CDATA status. A remote
 unauthenticated attacker can supply a single well-formed XML document of a few megabytes to an application
 parsing untrusted XML to cause excessive CPU consumption, resulting in denial of service without requiring
 authentication, external entity resolution, or non-default parser options. (CVE-2026-66046)

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-2026-66046

Plugin Details

Severity: High

ID: 462786

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.62

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-66046

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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:P/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 6.6

Threat Vector: CVSS:4.0/E:P

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 Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/20/2026

Vulnerability Publication Date: 8/18/2026

Reference Information

CVE: CVE-2026-66046

IAVA: 2026-A-0925-S