# CVE-2026-0992: 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. - Web page: https://patchblox.com/security/cve/CVE-2026-0992 - Priority: Routine - CVSS: 2.9 (Low) - EPSS: 0.0046 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jan 15, 2026 - Weakness: Uncontrolled Resource Consumption - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-0992 ## Description A flaw was found in the libxml2 library. This uncontrolled resource consumption vulnerability occurs when processing XML catalogs that contain repeated 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 | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libxml2 Debian 12.15 (bookworm) | 2.9.14+dfsg-1.3~deb12u6 | [DEBIAN-CVE-2026-0992](https://patchblox.com/security/data/fix/linux/debian-cve-2026-0992.md) | Jan 15, 2026 | | Linux | libxml2 Debian 13.5 (trixie) | 2.12.7+dfsg+really2.9.14-2.1+deb13u3 | [DEBIAN-CVE-2026-0992](https://patchblox.com/security/data/fix/linux/debian-cve-2026-0992.md) | Jan 15, 2026 | | Linux | libxml2 Debian 14 | 2.15.2+dfsg-0.1 | [DEBIAN-CVE-2026-0992](https://patchblox.com/security/data/fix/linux/debian-cve-2026-0992.md) | Jan 15, 2026 | | Linux | libxml2 Ubuntu 18.04.6 LTS (bionic) | 2.9.4+dfsg1-6.1ubuntu1.9+esm7 | [libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm7](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libxml2-2.9.4-dfsg1-6.1ubuntu1.9-esm7.md) | Jan 15, 2026 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libxml2-2.9.10-dfsg-5ubuntu0.20.04.10-esm4.md) | Jan 15, 2026 | | Linux | libxml2 Ubuntu 22.04.1 LTS (jammy) | 2.9.13+dfsg-1ubuntu0.11 | [libxml2 2.9.13+dfsg-1ubuntu0.11](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libxml2-2.9.13-dfsg-1ubuntu0.11.md) | Jan 15, 2026 | | Linux | libxml2 Ubuntu 24.04.5 LTS (noble) | 2.9.14+dfsg-1.3ubuntu3.7 | [libxml2 2.9.14+dfsg-1.3ubuntu3.7](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libxml2-2.9.14-dfsg-1.3ubuntu3.7.md) | Jan 15, 2026 | | Linux | libxml2 amzn 2023 | 2.10.4-1.amzn2023.0.16 | [ALAS2023-2026-1396](https://patchblox.com/security/data/fix/linux/alas2023-2026-1396.md) | Feb 5, 2026 | | Linux | libxml2 opensuse-leap 15.6 | 2.10.3-150500.5.38.1 | [SUSE-SU-2026:0570-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0570-1.md) | Feb 17, 2026 | | Linux | libxml2 opensuse-leap 16.0 | 2.13.8-160000.4.1 | [OPENSUSE-SU-2026:20312-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20312-1.md) | Mar 4, 2026 | | Linux | libxml2 sles 15.7 | 2.12.10-150700.4.11.1 | [SUSE-SU-2026:0605-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0605-1.md) | Feb 24, 2026 | | Linux | libxml2 sles 16.0 | 2.13.8-160000.4.1 | [SUSE-SU-2026:20631-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20631-1.md) | Mar 4, 2026 | | Linux | libxml2-16 Ubuntu 25.10 (questing) | 2.14.5+dfsg-0.2ubuntu0.1 | [libxml2-16 2.14.5+dfsg-0.2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libxml2-16-2.14.5-dfsg-0.2ubuntu0.1.md) | Jan 15, 2026 | | Linux | libxml2-debuginfo amzn 2023 | 2.10.4-1.amzn2023.0.16 | [ALAS2023-2026-1396](https://patchblox.com/security/data/fix/linux/alas2023-2026-1396.md) | Feb 5, 2026 | | Linux | libxml2-debugsource amzn 2023 | 2.10.4-1.amzn2023.0.16 | [ALAS2023-2026-1396](https://patchblox.com/security/data/fix/linux/alas2023-2026-1396.md) | Feb 5, 2026 | | Linux | libxml2-devel amzn 2023 | 2.10.4-1.amzn2023.0.16 | [ALAS2023-2026-1396](https://patchblox.com/security/data/fix/linux/alas2023-2026-1396.md) | Feb 5, 2026 | | Linux | libxml2-python opensuse-leap 15.6 | 2.10.3-150500.5.38.1 | [SUSE-SU-2026:0570-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0570-1.md) | Feb 17, 2026 | | Linux | libxml2-python opensuse-leap 16.0 | 2.13.8-160000.4.1 | [OPENSUSE-SU-2026:20312-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20312-1.md) | Mar 4, 2026 | | Linux | libxml2-python sles 15.7 | 2.12.10-150700.4.11.1 | [SUSE-SU-2026:0605-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0605-1.md) | Feb 24, 2026 | | Linux | libxml2-python sles 16.0 | 2.13.8-160000.4.1 | [SUSE-SU-2026:20631-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20631-1.md) | Mar 4, 2026 | | Linux | libxml2-static amzn 2023 | 2.10.4-1.amzn2023.0.16 | [ALAS2023-2026-1396](https://patchblox.com/security/data/fix/linux/alas2023-2026-1396.md) | Feb 5, 2026 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libxml2-utils-2.9.4-dfsg1-6.1ubuntu1.9-esm7.md) | Jan 15, 2026 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libxml2-utils-2.9.10-dfsg-5ubuntu0.20.04.10-esm4.md) | Jan 15, 2026 | | Linux | libxml2-utils Ubuntu 22.04.1 LTS (jammy) | 2.9.13+dfsg-1ubuntu0.11 | [libxml2-utils 2.9.13+dfsg-1ubuntu0.11](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libxml2-utils-2.9.13-dfsg-1ubuntu0.11.md) | Jan 15, 2026 | | Linux | libxml2-utils Ubuntu 24.04.5 LTS (noble) | 2.9.14+dfsg-1.3ubuntu3.7 | [libxml2-utils 2.9.14+dfsg-1.3ubuntu3.7](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libxml2-utils-2.9.14-dfsg-1.3ubuntu3.7.md) | Jan 15, 2026 | | Linux | libxml2-utils Ubuntu 25.10 (questing) | 2.14.5+dfsg-0.2ubuntu0.1 | [libxml2-utils 2.14.5+dfsg-0.2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libxml2-utils-2.14.5-dfsg-0.2ubuntu0.1.md) | Jan 15, 2026 | | Linux | libxslt opensuse-leap 16.0 | 1.1.43-160000.4.1 | [OPENSUSE-SU-2026:20312-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20312-1.md) | Mar 4, 2026 | | Linux | libxslt sles 16.0 | 1.1.43-160000.4.1 | [SUSE-SU-2026:20631-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20631-1.md) | Mar 4, 2026 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-libxml2-2.9.4-dfsg1-6.1ubuntu1.9-esm7.md) | Jan 15, 2026 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-libxml2-2.9.10-dfsg-5ubuntu0.20.04.10-esm4.md) | Jan 15, 2026 | | Linux | python-libxml2-python opensuse-leap 15.6 | 2.9.7-150000.3.94.1 | [SUSE-SU-2026:0568-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0568-1.md) | Feb 17, 2026 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python3-libxml2-2.9.4-dfsg1-6.1ubuntu1.9-esm7.md) | Jan 15, 2026 | | Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-libxml2-2.9.10-dfsg-5ubuntu0.20.04.10-esm4.md) | Jan 15, 2026 | | Linux | python3-libxml2 Ubuntu 22.04.1 LTS (jammy) | 2.9.13+dfsg-1ubuntu0.11 | [python3-libxml2 2.9.13+dfsg-1ubuntu0.11](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-libxml2-2.9.13-dfsg-1ubuntu0.11.md) | Jan 15, 2026 | | Linux | python3-libxml2 Ubuntu 24.04.5 LTS (noble) | 2.9.14+dfsg-1.3ubuntu3.7 | [python3-libxml2 2.9.14+dfsg-1.3ubuntu3.7](https://patchblox.com/security/data/fix/linux/ubuntu-noble-python3-libxml2-2.9.14-dfsg-1.3ubuntu3.7.md) | Jan 15, 2026 | | Linux | python3-libxml2 Ubuntu 25.10 (questing) | 2.14.5+dfsg-0.2ubuntu0.1 | [python3-libxml2 2.14.5+dfsg-0.2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-python3-libxml2-2.14.5-dfsg-0.2ubuntu0.1.md) | Jan 15, 2026 | | Linux | python3-libxml2 amzn 2023 | 2.10.4-1.amzn2023.0.16 | [ALAS2023-2026-1396](https://patchblox.com/security/data/fix/linux/alas2023-2026-1396.md) | Feb 5, 2026 | | Linux | python3-libxml2-debuginfo amzn 2023 | 2.10.4-1.amzn2023.0.16 | [ALAS2023-2026-1396](https://patchblox.com/security/data/fix/linux/alas2023-2026-1396.md) | Feb 5, 2026 | --- Data as of 2026-11-08T00:53:09Z UTC. 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