Detections
Analytics

Echo: expat: security update to 2.8.4-1

high Tenable Cloud Security Plugin ID 459021

Description

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

 - In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to
 insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of
 service via crafted XML content. (CVE-2026-76956)

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-2026-76956

Plugin Details

Severity: High

ID: 459021

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-2026-76956

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: 8/20/2026

Vulnerability Publication Date: 8/20/2026

Reference Information

CVE: CVE-2026-76956

IAVA: 2026-A-0925-S