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).
CVSS Details
- CVSS 3.1 Base Score: 4.9
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade expat | Jun 29, 2026 | Jun 19, 2026 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade firefox | Jul 8, 2026 | Jul 8, 2026 |
| Amazon_linux_2023 | — | Upgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade firefox | Jul 8, 2026 | Jun 19, 2026 |
| Debian | — | Upgrade expat | Aug 2, 2026 | Aug 2, 2026 |
| Freebsd | — | Upgrade expatUpgrade linux-c7-expatUpgrade linux-rl9-expat | Jun 30, 2026 | Jun 28, 2026 |
| Ibm Aix | — | Apply the fix or workaround for python_advisory20 | Jul 15, 2026 | Jul 14, 2026 |
| Redhat_linux | — | No solution exists | Aug 4, 2026 | Jun 19, 2026 |
| Ubuntu | — | Upgrade expat (Ubuntu Pro)Upgrade expat | Sep 24, 2026 | Jun 19, 2026 |
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