# CVE-2025-6021: Libxml2: integer overflow in xmlbuildqname() leads to stack buffer overflow in libxml2 CVE-2025-6021 is fixed in 11 products on 1 platform, first by RHSA-2025:10630, released June 12, 2025. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2025-6021 - Priority: High - CVSS: 9.1 (Moderate) - EPSS: 0.0147 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 12, 2025 - Weakness: Stack-based Buffer Overflow - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-6021 ## Description A flaw was found in libxml2's xmlBuildQName function, where integeroverflows in buffer size calculations can lead to a stack-based bufferoverflow. This issue can result in memory corruption or a denial of servicewhen processing crafted input. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libxml2 Debian 12.15 (bookworm) | 2.9.14+dfsg-1.3~deb12u3 | [DEBIAN-CVE-2025-6021](https://patchblox.com/security/data/fix/linux/debian-cve-2025-6021.md) | Jun 12, 2025 | | Linux | libxml2 Debian 13.5 (trixie) | 2.12.7+dfsg+really2.9.14-2 | [DEBIAN-CVE-2025-6021](https://patchblox.com/security/data/fix/linux/debian-cve-2025-6021.md) | Jun 12, 2025 | | Linux | libxml2 Debian 14 | 2.12.7+dfsg+really2.9.14-2 | [DEBIAN-CVE-2025-6021](https://patchblox.com/security/data/fix/linux/debian-cve-2025-6021.md) | Jun 12, 2025 | | Linux | libxml2 RHEL 10 | 2.12.5-7.el10_0 | [RHSA-2025:10630](https://patchblox.com/security/data/fix/linux/rhsa-2025-10630.md) | Jun 12, 2025 | | Linux | libxml2 RHEL 8 | 0:2.9.7-21.el8_10.1 | [RHSA-2025:10698](https://patchblox.com/security/data/fix/linux/rhsa-2025-10698.md) | Jul 9, 2025 | | Linux | libxml2 RHEL 9 | 0:2.9.13-10.el9_6 | [RHSA-2025:10699](https://patchblox.com/security/data/fix/linux/rhsa-2025-10699.md) | Jul 9, 2025 | | Linux | libxml2 Ubuntu 18.04.6 LTS (bionic) | 2.9.4+dfsg1-6.1ubuntu1.9+esm4 | [libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libxml2-2.9.4-dfsg1-6.1ubuntu1.9-esm4.md) | Jun 16, 2025 | | Linux | libxml2 Ubuntu 20.04 LTS (focal) | 2.9.10+dfsg-5ubuntu0.20.04.10+esm1 | [libxml2 2.9.10+dfsg-5ubuntu0.20.04.10+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libxml2-2.9.10-dfsg-5ubuntu0.20.04.10-esm1.md) | Jun 16, 2025 | | Linux | libxml2 Ubuntu 22.04.1 LTS (jammy) | 2.9.13+dfsg-1ubuntu0.8 | [libxml2 2.9.13+dfsg-1ubuntu0.8](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libxml2-2.9.13-dfsg-1ubuntu0.8.md) | Jun 16, 2025 | | Linux | libxml2 Ubuntu 24.04.5 LTS (noble) | 2.9.14+dfsg-1.3ubuntu3.4 | [libxml2 2.9.14+dfsg-1.3ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libxml2-2.9.14-dfsg-1.3ubuntu3.4.md) | Jun 16, 2025 | | Linux | libxml2 Ubuntu 25.04 (plucky) | 2.12.7+dfsg+really2.9.14-0.4ubuntu0.2 | [libxml2 2.12.7+dfsg+really2.9.14-0.4ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libxml2-2.12.7-dfsg-really2.9.14-0.4ubuntu0.2.md) | Jan 16, 2026 | | Linux | libxml2 almalinux 10 | 2.12.5-7.el10_0 | [ALSA-2025:10630](https://patchblox.com/security/data/fix/linux/alsa-2025-10630.md) | Jul 8, 2025 | | Linux | libxml2 almalinux 8 | 2.9.7-21.el8_10.1 | [ALSA-2025:10698](https://patchblox.com/security/data/fix/linux/alsa-2025-10698.md) | Jul 9, 2025 | | Linux | libxml2 almalinux 9 | 2.9.13-10.el9_6 | [ALSA-2025:10699](https://patchblox.com/security/data/fix/linux/alsa-2025-10699.md) | Jul 9, 2025 | | Linux | libxml2 amzn 2023 | 2.10.4-1.amzn2023.0.11 | [ALAS2023-2025-1019](https://patchblox.com/security/data/fix/linux/alas2023-2025-1019.md) | Jun 18, 2025 | | Linux | libxml2 ol 10 | 0:2.12.5-7.el10_0 | [ELSA-2025-10630](https://patchblox.com/security/data/fix/linux/elsa-2025-10630.md) | Jul 8, 2025 | | Linux | libxml2 ol 8 | 0:2.9.7-21.el8_10.1 | [ELSA-2025-10698](https://patchblox.com/security/data/fix/linux/elsa-2025-10698.md) | Jul 9, 2025 | | Linux | libxml2 ol 9 | 0:2.9.13-10.el9_6 | [ELSA-2025-10699](https://patchblox.com/security/data/fix/linux/elsa-2025-10699.md) | Jul 9, 2025 | | Linux | libxml2 opensuse-leap 15.6 | 2.10.3-150500.5.29.1 | [SUSE-SU-2025:02314-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02314-1.md) | Jul 15, 2025 | | Linux | libxml2 rocky 10 | 0:2.12.5-7.el10_0 | [RLSA-2025:10630](https://patchblox.com/security/data/fix/linux/rlsa-2025-10630.md) | Oct 3, 2025 | | Linux | libxml2 rocky 8 | 0:2.9.7-21.el8_10.1 | [RLSA-2025:10698](https://patchblox.com/security/data/fix/linux/rlsa-2025-10698.md) | Jul 29, 2025 | | Linux | libxml2 rocky 9 | 0:2.9.13-10.el9_6 | [RLSA-2025:10699](https://patchblox.com/security/data/fix/linux/rlsa-2025-10699.md) | Oct 4, 2025 | | Linux | libxml2 sles 15.6 | 2.10.3-150500.5.29.1 | [SUSE-SU-2025:02314-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02314-1.md) | Jul 15, 2025 | | Linux | libxml2 sles 15.7 | 2.12.10-150700.4.3.1 | [SUSE-SU-2025:02260-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02260-1.md) | Jul 9, 2025 | | Linux | libxml2-debuginfo amzn 2023 | 2.10.4-1.amzn2023.0.11 | [ALAS2023-2025-1019](https://patchblox.com/security/data/fix/linux/alas2023-2025-1019.md) | Jun 18, 2025 | | Linux | libxml2-debugsource amzn 2023 | 2.10.4-1.amzn2023.0.11 | [ALAS2023-2025-1019](https://patchblox.com/security/data/fix/linux/alas2023-2025-1019.md) | Jun 18, 2025 | | Linux | libxml2-devel RHEL 8 | 0:2.9.7-21.el8_10.1 | [RHSA-2025:10698](https://patchblox.com/security/data/fix/linux/rhsa-2025-10698.md) | Jul 9, 2025 | | Linux | libxml2-devel RHEL 9 | 0:2.9.13-10.el9_6 | [RHSA-2025:10699](https://patchblox.com/security/data/fix/linux/rhsa-2025-10699.md) | Jul 9, 2025 | | Linux | libxml2-devel almalinux 10 | 2.12.5-7.el10_0 | [ALSA-2025:10630](https://patchblox.com/security/data/fix/linux/alsa-2025-10630.md) | Jul 8, 2025 | | Linux | libxml2-devel almalinux 8 | 2.9.7-21.el8_10.1 | [ALSA-2025:10698](https://patchblox.com/security/data/fix/linux/alsa-2025-10698.md) | Jul 9, 2025 | | Linux | libxml2-devel almalinux 9 | 2.9.13-10.el9_6 | [ALSA-2025:10699](https://patchblox.com/security/data/fix/linux/alsa-2025-10699.md) | Jul 9, 2025 | | Linux | libxml2-devel amzn 2023 | 2.10.4-1.amzn2023.0.11 | [ALAS2023-2025-1019](https://patchblox.com/security/data/fix/linux/alas2023-2025-1019.md) | Jun 18, 2025 | | Linux | libxml2-devel ol 10 | 0:2.12.5-7.el10_0 | [ELSA-2025-10630](https://patchblox.com/security/data/fix/linux/elsa-2025-10630.md) | Jul 8, 2025 | | Linux | libxml2-devel ol 8 | 0:2.9.7-21.el8_10.1 | [ELSA-2025-10698](https://patchblox.com/security/data/fix/linux/elsa-2025-10698.md) | Jul 9, 2025 | | Linux | libxml2-devel ol 9 | 0:2.9.13-10.el9_6 | [ELSA-2025-10699](https://patchblox.com/security/data/fix/linux/elsa-2025-10699.md) | Jul 9, 2025 | | Linux | libxml2-python opensuse-leap 15.6 | 2.10.3-150500.5.29.1 | [SUSE-SU-2025:02314-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02314-1.md) | Jul 15, 2025 | | Linux | libxml2-python sles 15.6 | 2.10.3-150500.5.29.1 | [SUSE-SU-2025:02314-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02314-1.md) | Jul 15, 2025 | | Linux | libxml2-python sles 15.7 | 2.12.10-150700.4.3.1 | [SUSE-SU-2025:02260-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02260-1.md) | Jul 9, 2025 | | Linux | libxml2-static almalinux 10 | 2.12.5-7.el10_0 | [ALSA-2025:10630](https://patchblox.com/security/data/fix/linux/alsa-2025-10630.md) | Jul 8, 2025 | | Linux | libxml2-static amzn 2023 | 2.10.4-1.amzn2023.0.11 | [ALAS2023-2025-1019](https://patchblox.com/security/data/fix/linux/alas2023-2025-1019.md) | Jun 18, 2025 | | Linux | libxml2-static ol 10 | 0:2.12.5-7.el10_0 | [ELSA-2025-10630](https://patchblox.com/security/data/fix/linux/elsa-2025-10630.md) | Jul 8, 2025 | | Linux | libxml2-utils Ubuntu 18.04.6 LTS (bionic) | 2.9.4+dfsg1-6.1ubuntu1.9+esm4 | [libxml2-utils 2.9.4+dfsg1-6.1ubuntu1.9+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libxml2-utils-2.9.4-dfsg1-6.1ubuntu1.9-esm4.md) | Jun 16, 2025 | | Linux | libxml2-utils Ubuntu 20.04 LTS (focal) | 2.9.10+dfsg-5ubuntu0.20.04.10+esm1 | [libxml2-utils 2.9.10+dfsg-5ubuntu0.20.04.10+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libxml2-utils-2.9.10-dfsg-5ubuntu0.20.04.10-esm1.md) | Jun 16, 2025 | | Linux | libxml2-utils Ubuntu 22.04.1 LTS (jammy) | 2.9.13+dfsg-1ubuntu0.8 | [libxml2-utils 2.9.13+dfsg-1ubuntu0.8](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libxml2-utils-2.9.13-dfsg-1ubuntu0.8.md) | Jun 16, 2025 | | Linux | libxml2-utils Ubuntu 24.04.5 LTS (noble) | 2.9.14+dfsg-1.3ubuntu3.4 | [libxml2-utils 2.9.14+dfsg-1.3ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libxml2-utils-2.9.14-dfsg-1.3ubuntu3.4.md) | Jun 16, 2025 | | Linux | libxml2-utils Ubuntu 25.04 (plucky) | 2.12.7+dfsg+really2.9.14-0.4ubuntu0.2 | [libxml2-utils 2.12.7+dfsg+really2.9.14-0.4ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libxml2-utils-2.12.7-dfsg-really2.9.14-0.4ubuntu0.2.md) | Jan 16, 2026 | | Linux | python-libxml2 Ubuntu 18.04.6 LTS (bionic) | 2.9.4+dfsg1-6.1ubuntu1.9+esm4 | [python-libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-libxml2-2.9.4-dfsg1-6.1ubuntu1.9-esm4.md) | Jun 16, 2025 | | Linux | python-libxml2 Ubuntu 20.04 LTS (focal) | 2.9.10+dfsg-5ubuntu0.20.04.10+esm1 | [python-libxml2 2.9.10+dfsg-5ubuntu0.20.04.10+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python-libxml2-2.9.10-dfsg-5ubuntu0.20.04.10-esm1.md) | Jun 16, 2025 | | Linux | python-libxml2-python opensuse-leap 15.6 | 2.9.7-150000.3.82.1 | [SUSE-SU-2025:02275-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02275-1.md) | Jul 10, 2025 | | Linux | python3-libxml2 RHEL 8 | 0:2.9.7-21.el8_10.1 | [RHSA-2025:10698](https://patchblox.com/security/data/fix/linux/rhsa-2025-10698.md) | Jul 9, 2025 | | Linux | python3-libxml2 RHEL 9 | 0:2.9.13-10.el9_6 | [RHSA-2025:10699](https://patchblox.com/security/data/fix/linux/rhsa-2025-10699.md) | Jul 9, 2025 | | Linux | python3-libxml2 Ubuntu 18.04.6 LTS (bionic) | 2.9.4+dfsg1-6.1ubuntu1.9+esm4 | [python3-libxml2 2.9.4+dfsg1-6.1ubuntu1.9+esm4](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python3-libxml2-2.9.4-dfsg1-6.1ubuntu1.9-esm4.md) | Jun 16, 2025 | | Linux | python3-libxml2 Ubuntu 20.04 LTS (focal) | 2.9.10+dfsg-5ubuntu0.20.04.10+esm1 | [python3-libxml2 2.9.10+dfsg-5ubuntu0.20.04.10+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-libxml2-2.9.10-dfsg-5ubuntu0.20.04.10-esm1.md) | Jun 16, 2025 | | Linux | python3-libxml2 Ubuntu 22.04.1 LTS (jammy) | 2.9.13+dfsg-1ubuntu0.8 | [python3-libxml2 2.9.13+dfsg-1ubuntu0.8](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-libxml2-2.9.13-dfsg-1ubuntu0.8.md) | Jun 16, 2025 | | Linux | python3-libxml2 Ubuntu 24.04.5 LTS (noble) | 2.9.14+dfsg-1.3ubuntu3.4 | [python3-libxml2 2.9.14+dfsg-1.3ubuntu3.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-python3-libxml2-2.9.14-dfsg-1.3ubuntu3.4.md) | Jun 16, 2025 | | Linux | python3-libxml2 Ubuntu 25.04 (plucky) | 2.12.7+dfsg+really2.9.14-0.4ubuntu0.2 | [python3-libxml2 2.12.7+dfsg+really2.9.14-0.4ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-python3-libxml2-2.12.7-dfsg-really2.9.14-0.4ubuntu0.2.md) | Jan 16, 2026 | | Linux | python3-libxml2 almalinux 10 | 2.12.5-7.el10_0 | [ALSA-2025:10630](https://patchblox.com/security/data/fix/linux/alsa-2025-10630.md) | Jul 8, 2025 | | Linux | python3-libxml2 almalinux 8 | 2.9.7-21.el8_10.1 | [ALSA-2025:10698](https://patchblox.com/security/data/fix/linux/alsa-2025-10698.md) | Jul 9, 2025 | | Linux | python3-libxml2 almalinux 9 | 2.9.13-10.el9_6 | [ALSA-2025:10699](https://patchblox.com/security/data/fix/linux/alsa-2025-10699.md) | Jul 9, 2025 | | Linux | python3-libxml2 amzn 2023 | 2.10.4-1.amzn2023.0.11 | [ALAS2023-2025-1019](https://patchblox.com/security/data/fix/linux/alas2023-2025-1019.md) | Jun 18, 2025 | | Linux | python3-libxml2 ol 10 | 0:2.12.5-7.el10_0 | [ELSA-2025-10630](https://patchblox.com/security/data/fix/linux/elsa-2025-10630.md) | Jul 8, 2025 | | Linux | python3-libxml2 ol 8 | 0:2.9.7-21.el8_10.1 | [ELSA-2025-10698](https://patchblox.com/security/data/fix/linux/elsa-2025-10698.md) | Jul 9, 2025 | | Linux | python3-libxml2 ol 9 | 0:2.9.13-10.el9_6 | [ELSA-2025-10699](https://patchblox.com/security/data/fix/linux/elsa-2025-10699.md) | Jul 9, 2025 | | Linux | python3-libxml2-debuginfo amzn 2023 | 2.10.4-1.amzn2023.0.11 | [ALAS2023-2025-1019](https://patchblox.com/security/data/fix/linux/alas2023-2025-1019.md) | Jun 18, 2025 | --- Data as of 2026-11-09T01:18:40Z UTC. 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