# CVE-2026-8177: XML::LibXML versions through 2.0210 for Perl read out-of-bounds heap memory when parsing XML node names containing truncated UTF-8 byte sequences CVE-2026-8177 is fixed in 5 products on 1 platform, first by RHSA-2026:68632, released May 10, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-8177 - Priority: High - CVSS: 7.5 (Moderate) - EPSS: 0.0065 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: May 10, 2026 - Weakness: Out-of-bounds Read - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-8177 ## Description XML::LibXML versions through 2.0210 for Perl read out-of-bounds heap memory when parsing XML node names containing truncated UTF-8 byte sequences. A node name ending in the middle of a multi byte UTF-8 sequence causes the parser to read past the end of the input string into adjacent heap memory. Any Perl process that passes attacker controlled strings to XML::LibXML's DOM node-name methods can reach this path on the default API. The likely consequence is a crash, causing denial of service. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libxml-libxml-perl Debian 12.15 (bookworm) | 2.0207+dfsg+really+2.0134-1+deb12u1 | [DEBIAN-CVE-2026-8177](https://patchblox.com/security/data/fix/linux/debian-cve-2026-8177.md) | May 10, 2026 | | Linux | libxml-libxml-perl Debian 13.5 (trixie) | 2.0207+dfsg+really+2.0134-5+deb13u1 | [DEBIAN-CVE-2026-8177](https://patchblox.com/security/data/fix/linux/debian-cve-2026-8177.md) | May 10, 2026 | | Linux | libxml-libxml-perl Debian 14 | 2.0207+dfsg+really+2.0134-8 | [DEBIAN-CVE-2026-8177](https://patchblox.com/security/data/fix/linux/debian-cve-2026-8177.md) | May 10, 2026 | | Linux | perl-XML-LibXML RHEL 10 | 2.0210-4.el10_0.1 | [RHSA-2026:68632](https://patchblox.com/security/data/fix/linux/rhsa-2026-68632.md) | May 10, 2026 | | Linux | perl-XML-LibXML RHEL 8 | 1:2.0132-3.el8_10 | [RHSA-2026:39878](https://patchblox.com/security/data/fix/linux/rhsa-2026-39878.md) | Jul 18, 2026 | | Linux | perl-XML-LibXML RHEL 9 | 1:2.0206-5.el9_8.1 | [RHSA-2026:39553](https://patchblox.com/security/data/fix/linux/rhsa-2026-39553.md) | Jul 18, 2026 | | Linux | perl-XML-LibXML almalinux 10 | 1:2.0210-4.el10_2.1 | [ALSA-2026:39547](https://patchblox.com/security/data/fix/linux/alsa-2026-39547.md) | Jul 14, 2026 | | Linux | perl-XML-LibXML almalinux 8 | 1:2.0132-3.el8_10 | [ALSA-2026:39878](https://patchblox.com/security/data/fix/linux/alsa-2026-39878.md) | Jul 15, 2026 | | Linux | perl-XML-LibXML almalinux 9 | 1:2.0206-5.el9_8.1 | [ALSA-2026:39553](https://patchblox.com/security/data/fix/linux/alsa-2026-39553.md) | Jul 14, 2026 | | Linux | perl-XML-LibXML amzn 2023 | 1:2.0210-7.amzn2023.0.3 | [ALAS2023-2026-1795](https://patchblox.com/security/data/fix/linux/alas2023-2026-1795.md) | Jun 8, 2026 | | Linux | perl-XML-LibXML ol 10 | 1:2.0210-4.el10_2.1 | [ELSA-2026-39547](https://patchblox.com/security/data/fix/linux/elsa-2026-39547.md) | Jul 16, 2026 | | Linux | perl-XML-LibXML ol 8 | 1:2.0132-3.el8_10 | [ELSA-2026-39878](https://patchblox.com/security/data/fix/linux/elsa-2026-39878.md) | Jul 15, 2026 | | Linux | perl-XML-LibXML ol 9 | 1:2.0206-5.el9_8.1 | [ELSA-2026-39553](https://patchblox.com/security/data/fix/linux/elsa-2026-39553.md) | Jul 14, 2026 | | Linux | perl-XML-LibXML opensuse-leap 16.0 | 2.0210-160000.3.1 | [OPENSUSE-SU-2026:20908-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20908-1.md) | Jun 5, 2026 | | Linux | perl-XML-LibXML rocky 10 | 1:2.0210-4.el10_2.1 | [RLSA-2026:39547](https://patchblox.com/security/data/fix/linux/rlsa-2026-39547.md) | Jul 15, 2026 | | Linux | perl-XML-LibXML rocky 8 | 1:2.0132-3.el8_10 | [RLSA-2026:39878](https://patchblox.com/security/data/fix/linux/rlsa-2026-39878.md) | Jul 16, 2026 | | Linux | perl-XML-LibXML rocky 9 | 1:2.0206-5.el9_8.1 | [RLSA-2026:39553](https://patchblox.com/security/data/fix/linux/rlsa-2026-39553.md) | Jul 15, 2026 | | Linux | perl-XML-LibXML sles 15.6 | 2.0132-150000.3.8.1 | [SUSE-SU-2026:2324-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2324-1.md) | Jun 9, 2026 | | Linux | perl-XML-LibXML sles 15.7 | 2.0132-150000.3.8.1 | [SUSE-SU-2026:2324-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2324-1.md) | Jun 9, 2026 | | Linux | perl-XML-LibXML sles 16.0 | 2.0210-160000.3.1 | [SUSE-SU-2026:22081-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22081-1.md) | Jun 5, 2026 | | Linux | perl-XML-LibXML-debuginfo amzn 2023 | 1:2.0210-7.amzn2023.0.3 | [ALAS2023-2026-1795](https://patchblox.com/security/data/fix/linux/alas2023-2026-1795.md) | Jun 8, 2026 | | Linux | perl-XML-LibXML-debugsource amzn 2023 | 1:2.0210-7.amzn2023.0.3 | [ALAS2023-2026-1795](https://patchblox.com/security/data/fix/linux/alas2023-2026-1795.md) | Jun 8, 2026 | | Linux | perl-XML-LibXML-tests amzn 2023 | 1:2.0210-7.amzn2023.0.3 | [ALAS2023-2026-1795](https://patchblox.com/security/data/fix/linux/alas2023-2026-1795.md) | Jun 8, 2026 | --- Data as of 2026-11-08T13:06:02Z UTC. 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