libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_GetBuffer, XML_Parse, XML_ParseBuffer, XML_ParserFree, or XML_ParserReset from within handlers in cases of a policy violation. Thus, a use-after-free can occur,
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade expatUpgrade expat-devel | Oct 11, 2026 | Sep 8, 2026 |
| Alpine Linux | — | Upgrade expat | Jun 29, 2026 | Jun 4, 2026 |
| Amazon Linux Ami 2 | — | Upgrade firefoxUpgrade thunderbird | Jul 8, 2026 | Jul 8, 2026 |
| Amazon_linux_2023 | — | Upgrade expat-develUpgrade firefoxUpgrade firefox-debuginfoUpgrade expatUpgrade expat-staticUpgrade expat-debuginfoUpgrade firefox-debugsourceUpgrade expat-debugsource | Jul 8, 2026 | Jun 4, 2026 |
| Debian | — | Upgrade expat | Aug 2, 2026 | Aug 2, 2026 |
| Freebsd | — | Upgrade linux-rl9-expatUpgrade expatUpgrade linux-c7-expat | Jun 30, 2026 | Jun 28, 2026 |
| Ibm Aix | — | Apply the fix or workaround for python_advisory21Apply the fix or workaround for python_advisory20 | Jul 15, 2026 | Jul 14, 2026 |
| Redhat_linux | — | Upgrade expat-debuginfoUpgrade expatNo solution existsUpgrade expat-debugsourceUpgrade expat-devel | Jul 17, 2026 | Jun 4, 2026 |
| Rocky_linux | — | Upgrade expatUpgrade expat-debugsourceUpgrade expat-develUpgrade expat-debuginfo | Sep 10, 2026 | Sep 9, 2026 |
| Ubuntu | — | Upgrade libexpat1-dev (Ubuntu Pro)Upgrade expat (Ubuntu Pro)Upgrade libexpat1-devUpgrade lib64expat1 (Ubuntu Pro)Upgrade libexpat1 (Ubuntu Pro)Upgrade libexpat1Upgrade lib64expat1-dev (Ubuntu Pro)Upgrade expat | Sep 22, 2026 | Sep 21, 2026 |
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