Use After Free Affecting expat package, versions <2.5.0-1+deb12u3


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.11% (2nd percentile)

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  • Snyk IDSNYK-ECHOLATEST-EXPAT-19012635
  • published20 Aug 2026
  • disclosed20 Aug 2026

Introduced: 20 Aug 2026

CVE-2026-76957  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade Echo:latest expat to version 2.5.0-1+deb12u3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream expat package and not the expat package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.

CVSS Base Scores

version 3.1