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In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade expat-develUpgrade expat | Oct 11, 2026 | Sep 8, 2026 |
| Alpine Linux | — | Upgrade expat | Jun 29, 2026 | Jun 19, 2026 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade firefoxUpgrade expat-develUpgrade expatUpgrade expat-staticUpgrade expat-debuginfo | Jul 8, 2026 | Jul 8, 2026 |
| Amazon_linux_2023 | — | Upgrade firefox-debugsourceUpgrade expatUpgrade expat-staticUpgrade expat-develUpgrade expat-debugsourceUpgrade firefoxUpgrade firefox-debuginfoUpgrade expat-debuginfo | Jul 8, 2026 | Jun 19, 2026 |
| Debian | — | Upgrade expat | Aug 2, 2026 | Aug 2, 2026 |
| Freebsd | — | Upgrade linux-c7-expatUpgrade linux-rl9-expatUpgrade expat | Jun 30, 2026 | Jun 28, 2026 |
| Ibm Aix | — | Apply the fix or workaround for python_advisory20 | Jul 15, 2026 | Jul 14, 2026 |
| Oracle_linux | — | Upgrade expatUpgrade expat-devel | Oct 22, 2026 | Jun 19, 2026 |
| Redhat_linux | — | Upgrade expatUpgrade expat-debugsourceUpgrade expat-debuginfoNo solution existsUpgrade expat-devel | Jul 17, 2026 | Jun 19, 2026 |
| Rocky_linux | — | Upgrade expat-develUpgrade expat-debuginfoUpgrade expat-debugsourceUpgrade expat | Sep 10, 2026 | Sep 9, 2026 |
| Ubuntu | — | Upgrade libexpat1Upgrade lib64expat1-dev (Ubuntu Pro)Upgrade lib64expat1 (Ubuntu Pro)Upgrade expatUpgrade libexpat1 (Ubuntu Pro)Upgrade expat (Ubuntu Pro)Upgrade libexpat1-devUpgrade libexpat1-dev (Ubuntu Pro) | Sep 24, 2026 | Jun 19, 2026 |
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