libxml2: A flaw was found in libxml2
CVE-2026-76781 is fixed in 11 products on 1 platform, first by libxml2-16 2.15.2+dfsg-0.1ubuntu0.3, released September 17, 2026. It is not reported as exploited. Patch Radar priority: Routine.
A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can trigger a NULL pointer dereference during XML catalog parsing. This occurs when a `nextCatalog` element lacks its mandatory `catalog` attribute, leading to the application crashing and causing a Denial of Service (DoS).
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libxml2 · Debian 14 | 2.15.4+dfsg-1 | DEBIAN-CVE-2026-76781 | Sep 20, 2026 |
| libxml2 · Ubuntu 18.04.6 LTS (bionic) | 2.9.4+dfsg1-6.1ubuntu1.9+esm9 | libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm9 | Oct 9, 2026 |
| libxml2 · Ubuntu 20.04 LTS (focal) | 2.9.10+dfsg-5ubuntu0.20.04.10+esm6 | libxml2 2.9.10+dfsg-5ubuntu0.20.04.10+esm6 | Oct 9, 2026 |
| libxml2 · Ubuntu 22.04.1 LTS (jammy) | 2.9.13+dfsg-1ubuntu0.14 | libxml2 2.9.13+dfsg-1ubuntu0.14 | Oct 9, 2026 |
| libxml2 · Ubuntu 24.04.5 LTS (noble) | 2.9.14+dfsg-1.3ubuntu3.10 | libxml2 2.9.14+dfsg-1.3ubuntu3.10 | Oct 9, 2026 |
| libxml2 · amzn 2023 | 2.10.4-1.amzn2023.0.22 | ALAS2023-2026-3341 | Nov 7, 2026 |
| libxml2-16 · Ubuntu 26.04.1 LTS (resolute) | 2.15.2+dfsg-0.1ubuntu0.3 | libxml2-16 2.15.2+dfsg-0.1ubuntu0.3 | Sep 17, 2026 |
| libxml2-debuginfo · amzn 2023 | 2.10.4-1.amzn2023.0.22 | ALAS2023-2026-3341 | Nov 7, 2026 |
| libxml2-debugsource · amzn 2023 | 2.10.4-1.amzn2023.0.22 | ALAS2023-2026-3341 | Nov 7, 2026 |
| libxml2-devel · amzn 2023 | 2.10.4-1.amzn2023.0.22 | ALAS2023-2026-3341 | Nov 7, 2026 |
| libxml2-source · Ubuntu 26.04.1 LTS (resolute) | 2.15.2+dfsg-0.1ubuntu0.3 | libxml2-source 2.15.2+dfsg-0.1ubuntu0.3 | Sep 17, 2026 |
| libxml2-static · amzn 2023 | 2.10.4-1.amzn2023.0.22 | ALAS2023-2026-3341 | Nov 7, 2026 |
| libxml2-utils · Ubuntu 18.04.6 LTS (bionic) | 2.9.4+dfsg1-6.1ubuntu1.9+esm9 | libxml2-utils 2.9.4+dfsg1-6.1ubuntu1.9+esm9 | Oct 9, 2026 |
| libxml2-utils · Ubuntu 20.04 LTS (focal) | 2.9.10+dfsg-5ubuntu0.20.04.10+esm6 | libxml2-utils 2.9.10+dfsg-5ubuntu0.20.04.10+esm6 | Oct 9, 2026 |
| libxml2-utils · Ubuntu 22.04.1 LTS (jammy) | 2.9.13+dfsg-1ubuntu0.14 | libxml2-utils 2.9.13+dfsg-1ubuntu0.14 | Oct 9, 2026 |
| libxml2-utils · Ubuntu 24.04.5 LTS (noble) | 2.9.14+dfsg-1.3ubuntu3.10 | libxml2-utils 2.9.14+dfsg-1.3ubuntu3.10 | Oct 9, 2026 |
| libxml2-utils · Ubuntu 26.04.1 LTS (resolute) | 2.15.2+dfsg-0.1ubuntu0.3 | libxml2-utils 2.15.2+dfsg-0.1ubuntu0.3 | Sep 17, 2026 |
| python-libxml2 · Ubuntu 18.04.6 LTS (bionic) | 2.9.4+dfsg1-6.1ubuntu1.9+esm9 | python-libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm9 | Oct 9, 2026 |
| python-libxml2 · Ubuntu 20.04 LTS (focal) | 2.9.10+dfsg-5ubuntu0.20.04.10+esm6 | python-libxml2 2.9.10+dfsg-5ubuntu0.20.04.10+esm6 | Oct 9, 2026 |
| python3-libxml2 · Ubuntu 18.04.6 LTS (bionic) | 2.9.4+dfsg1-6.1ubuntu1.9+esm9 | python3-libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm9 | Oct 9, 2026 |
| python3-libxml2 · Ubuntu 20.04 LTS (focal) | 2.9.10+dfsg-5ubuntu0.20.04.10+esm6 | python3-libxml2 2.9.10+dfsg-5ubuntu0.20.04.10+esm6 | Oct 9, 2026 |
| python3-libxml2 · Ubuntu 22.04.1 LTS (jammy) | 2.9.13+dfsg-1ubuntu0.14 | python3-libxml2 2.9.13+dfsg-1ubuntu0.14 | Oct 9, 2026 |
| python3-libxml2 · Ubuntu 24.04.5 LTS (noble) | 2.9.14+dfsg-1.3ubuntu3.10 | python3-libxml2 2.9.14+dfsg-1.3ubuntu3.10 | Oct 9, 2026 |
| python3-libxml2 · Ubuntu 26.04.1 LTS (resolute) | 2.15.2+dfsg-0.1ubuntu0.3 | python3-libxml2 2.15.2+dfsg-0.1ubuntu0.3 | Sep 17, 2026 |
| python3-libxml2 · amzn 2023 | 2.10.4-1.amzn2023.0.22 | ALAS2023-2026-3341 | Nov 7, 2026 |
| python3-libxml2-debuginfo · amzn 2023 | 2.10.4-1.amzn2023.0.22 | ALAS2023-2026-3341 | Nov 7, 2026 |
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