In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade expatUpgrade expat-devel | Jun 3, 2026 | Jun 3, 2026 |
| Alpine Linux | — | Upgrade expat | Jun 18, 2026 | May 10, 2026 |
| Amazon Linux Ami 2 | — | Upgrade firefoxUpgrade thunderbird | Jun 8, 2026 | Jun 8, 2026 |
| Amazon_linux_2023 | — | Upgrade firefox-debuginfoUpgrade firefox-debugsourceUpgrade firefox | May 28, 2026 | May 10, 2026 |
| Debian | — | Upgrade expat | Aug 2, 2026 | May 10, 2026 |
| Freebsd | — | Upgrade linux-rl9-expatUpgrade linux-c7-expatUpgrade expat | May 13, 2026 | May 11, 2026 |
| Ibm Aix | — | Apply the fix or workaround for python_advisory20 | Jul 15, 2026 | Jul 14, 2026 |
| Ibm Http_server | — | Apply IBM HTTP Server version 9.0.5.29 or laterApply IBM HTTP Server version 8.5.5.30 or laterApply IBM HTTP Server Interim Fix PH71265 | May 28, 2026 | May 26, 2026 |
| Oracle_linux | — | Upgrade expat-develUpgrade expat | Jun 4, 2026 | May 10, 2026 |
| Redhat_linux | — | Upgrade expat-develUpgrade expat-debuginfoUpgrade expatNo solution existsUpgrade expat-debugsource | Jun 5, 2026 | May 10, 2026 |
| Rocky_linux | — | Upgrade expat-debugsourceUpgrade expat-develUpgrade expat-debuginfoUpgrade expat | Jun 8, 2026 | Jun 5, 2026 |
| Ubuntu | — | Upgrade libexpat1 (Ubuntu Pro)Upgrade libexpat1-dev (Ubuntu Pro)Upgrade lib64expat1 (Ubuntu Pro)Upgrade lib64expat1-dev (Ubuntu Pro)Upgrade expat (Ubuntu Pro)Upgrade expatUpgrade libexpat1-devUpgrade libexpat1 | Sep 22, 2026 | Sep 21, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | May 10, 2026 |
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