Libxml2: libxml2: denial of service via crafted xml catalogs
CVE-2026-0992 is fixed in 13 products on 1 platform, first by libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm7, released January 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.
A flaw was found in the libxml2 library. This uncontrolled resource consumption vulnerability occurs when processing XML catalogs that contain repeated <nextCatalog> elements pointing to the same downstream catalog. A remote attacker can exploit this by supplying crafted catalogs, causing the parser to redundantly traverse catalog chains. This leads to excessive CPU consumption and degrades application availability, resulting in a denial-of-service condition.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libxml2 · Debian 12.15 (bookworm) | 2.9.14+dfsg-1.3~deb12u6 | DEBIAN-CVE-2026-0992 | Jan 15, 2026 |
| libxml2 · Debian 13.5 (trixie) | 2.12.7+dfsg+really2.9.14-2.1+deb13u3 | DEBIAN-CVE-2026-0992 | Jan 15, 2026 |
| libxml2 · Debian 14 | 2.15.2+dfsg-0.1 | DEBIAN-CVE-2026-0992 | Jan 15, 2026 |
| libxml2 · Ubuntu 18.04.6 LTS (bionic) | 2.9.4+dfsg1-6.1ubuntu1.9+esm7 | libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm7 | Jan 15, 2026 |
| libxml2 · Ubuntu 20.04 LTS (focal) | 2.9.10+dfsg-5ubuntu0.20.04.10+esm4 | libxml2 2.9.10+dfsg-5ubuntu0.20.04.10+esm4 | Jan 15, 2026 |
| libxml2 · Ubuntu 22.04.1 LTS (jammy) | 2.9.13+dfsg-1ubuntu0.11 | libxml2 2.9.13+dfsg-1ubuntu0.11 | Jan 15, 2026 |
| libxml2 · Ubuntu 24.04.5 LTS (noble) | 2.9.14+dfsg-1.3ubuntu3.7 | libxml2 2.9.14+dfsg-1.3ubuntu3.7 | Jan 15, 2026 |
| libxml2 · amzn 2023 | 2.10.4-1.amzn2023.0.16 | ALAS2023-2026-1396 | Feb 5, 2026 |
| libxml2 · opensuse-leap 15.6 | 2.10.3-150500.5.38.1 | SUSE-SU-2026:0570-1 | Feb 17, 2026 |
| libxml2 · opensuse-leap 16.0 | 2.13.8-160000.4.1 | OPENSUSE-SU-2026:20312-1 | Mar 4, 2026 |
| libxml2 · sles 15.7 | 2.12.10-150700.4.11.1 | SUSE-SU-2026:0605-1 | Feb 24, 2026 |
| libxml2 · sles 16.0 | 2.13.8-160000.4.1 | SUSE-SU-2026:20631-1 | Mar 4, 2026 |
| libxml2-16 · Ubuntu 25.10 (questing) | 2.14.5+dfsg-0.2ubuntu0.1 | libxml2-16 2.14.5+dfsg-0.2ubuntu0.1 | Jan 15, 2026 |
| libxml2-debuginfo · amzn 2023 | 2.10.4-1.amzn2023.0.16 | ALAS2023-2026-1396 | Feb 5, 2026 |
| libxml2-debugsource · amzn 2023 | 2.10.4-1.amzn2023.0.16 | ALAS2023-2026-1396 | Feb 5, 2026 |
| libxml2-devel · amzn 2023 | 2.10.4-1.amzn2023.0.16 | ALAS2023-2026-1396 | Feb 5, 2026 |
| libxml2-python · opensuse-leap 15.6 | 2.10.3-150500.5.38.1 | SUSE-SU-2026:0570-1 | Feb 17, 2026 |
| libxml2-python · opensuse-leap 16.0 | 2.13.8-160000.4.1 | OPENSUSE-SU-2026:20312-1 | Mar 4, 2026 |
| libxml2-python · sles 15.7 | 2.12.10-150700.4.11.1 | SUSE-SU-2026:0605-1 | Feb 24, 2026 |
| libxml2-python · sles 16.0 | 2.13.8-160000.4.1 | SUSE-SU-2026:20631-1 | Mar 4, 2026 |
| libxml2-static · amzn 2023 | 2.10.4-1.amzn2023.0.16 | ALAS2023-2026-1396 | Feb 5, 2026 |
| libxml2-utils · Ubuntu 18.04.6 LTS (bionic) | 2.9.4+dfsg1-6.1ubuntu1.9+esm7 | libxml2-utils 2.9.4+dfsg1-6.1ubuntu1.9+esm7 | Jan 15, 2026 |
| libxml2-utils · Ubuntu 20.04 LTS (focal) | 2.9.10+dfsg-5ubuntu0.20.04.10+esm4 | libxml2-utils 2.9.10+dfsg-5ubuntu0.20.04.10+esm4 | Jan 15, 2026 |
| libxml2-utils · Ubuntu 22.04.1 LTS (jammy) | 2.9.13+dfsg-1ubuntu0.11 | libxml2-utils 2.9.13+dfsg-1ubuntu0.11 | Jan 15, 2026 |
| libxml2-utils · Ubuntu 24.04.5 LTS (noble) | 2.9.14+dfsg-1.3ubuntu3.7 | libxml2-utils 2.9.14+dfsg-1.3ubuntu3.7 | Jan 15, 2026 |
| libxml2-utils · Ubuntu 25.10 (questing) | 2.14.5+dfsg-0.2ubuntu0.1 | libxml2-utils 2.14.5+dfsg-0.2ubuntu0.1 | Jan 15, 2026 |
| libxslt · opensuse-leap 16.0 | 1.1.43-160000.4.1 | OPENSUSE-SU-2026:20312-1 | Mar 4, 2026 |
| libxslt · sles 16.0 | 1.1.43-160000.4.1 | SUSE-SU-2026:20631-1 | Mar 4, 2026 |
| python-libxml2 · Ubuntu 18.04.6 LTS (bionic) | 2.9.4+dfsg1-6.1ubuntu1.9+esm7 | python-libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm7 | Jan 15, 2026 |
| python-libxml2 · Ubuntu 20.04 LTS (focal) | 2.9.10+dfsg-5ubuntu0.20.04.10+esm4 | python-libxml2 2.9.10+dfsg-5ubuntu0.20.04.10+esm4 | Jan 15, 2026 |
| python-libxml2-python · opensuse-leap 15.6 | 2.9.7-150000.3.94.1 | SUSE-SU-2026:0568-1 | Feb 17, 2026 |
| python3-libxml2 · Ubuntu 18.04.6 LTS (bionic) | 2.9.4+dfsg1-6.1ubuntu1.9+esm7 | python3-libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm7 | Jan 15, 2026 |
| python3-libxml2 · Ubuntu 20.04 LTS (focal) | 2.9.10+dfsg-5ubuntu0.20.04.10+esm4 | python3-libxml2 2.9.10+dfsg-5ubuntu0.20.04.10+esm4 | Jan 15, 2026 |
| python3-libxml2 · Ubuntu 22.04.1 LTS (jammy) | 2.9.13+dfsg-1ubuntu0.11 | python3-libxml2 2.9.13+dfsg-1ubuntu0.11 | Jan 15, 2026 |
| python3-libxml2 · Ubuntu 24.04.5 LTS (noble) | 2.9.14+dfsg-1.3ubuntu3.7 | python3-libxml2 2.9.14+dfsg-1.3ubuntu3.7 | Jan 15, 2026 |
| python3-libxml2 · Ubuntu 25.10 (questing) | 2.14.5+dfsg-0.2ubuntu0.1 | python3-libxml2 2.14.5+dfsg-0.2ubuntu0.1 | Jan 15, 2026 |
| python3-libxml2 · amzn 2023 | 2.10.4-1.amzn2023.0.16 | ALAS2023-2026-1396 | Feb 5, 2026 |
| python3-libxml2-debuginfo · amzn 2023 | 2.10.4-1.amzn2023.0.16 | ALAS2023-2026-1396 | Feb 5, 2026 |
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