Use After Free Affecting expat package, versions <2.8.2-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-ALPINE323-EXPAT-17675118
- published29 Jun 2026
- disclosed19 Jun 2026
Introduced: 19 Jun 2026
NewCVE-2026-56131 (opens in a new tab)How to fix?
Upgrade Alpine:3.23 expat to version 2.8.2-r0 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 Alpine.
See How to fix? for Alpine:3.23 relevant fixed versions and status.
libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation).