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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).
| Reporter | Title | Published | Views | Family All 68 |
|---|---|---|---|---|
 | CVE-2026-50219 | 4 Jun 202604:20 | – | attackerkb |
| CVE-2026-56131 | 19 Jun 202602:56 | – | attackerkb |
 | Amazon Linux 2 : thunderbird, --advisory ALAS2-2026-3795 (ALAS-2026-3795) | 8 Jul 202600:00 | – | nessus |
| Amazon Linux 2 : firefox, --advisory ALAS2FIREFOX-2026-062 (ALASFIREFOX-2026-062) | 8 Jul 202600:00 | – | nessus |
| Fedora 44 : mingw-expat (2026-3cb1034453) | 6 Jul 202600:00 | – | nessus |
| Fedora 43 : mingw-expat (2026-6666907a26) | 6 Jul 202600:00 | – | nessus |
| FreeBSD : Multiple vulnerability found in Expat (d06b1fa2-731f-11f1-a0d2-589cfc10a551) | 29 Jun 202600:00 | – | nessus |
| Linux Distros Unpatched Vulnerability : CVE-2026-50219 | 4 Jun 202600:00 | – | nessus |
| Linux Distros Unpatched Vulnerability : CVE-2026-56131 | 20 Jun 202600:00 | – | nessus |
 | Important: thunderbird | 8 Jul 202600:00 | – | amazon |
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03 Jul 2026 08:05Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.14.9 - 5.9
EPSS0.00218
SSVC