--- id: CVE-2026-8177 title: >- 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… summary: >- 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… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cwe: - CWE-125 vendor: Red Hat product: Red Hat Enterprise Linux AppStream (v. 10) affected: - enterprise_linux 6 - enterprise_linux 7 - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_e4s_v_9_2 - enterprise_linux_appstream_v_9 patched: - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_e4s_v_9_2 - enterprise_linux_appstream_v_9 published: '2026-05-10' updated: '2026-09-18' sourceUpdated: '2026-09-18T13:18:37.633' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-8177' references: - url: >- https://github.com/cpan-authors/XML-LibXML/commit/15652bd905a6c9dda59a81b14d4766adbbae2ea8.patch label: 9b29abf9-4ab0-4765-b253-1875cd9b441e - url: 'https://github.com/cpan-authors/XML-LibXML/issues/146' label: 9b29abf9-4ab0-4765-b253-1875cd9b441e - url: 'https://github.com/cpan-authors/XML-LibXML/pull/149' label: 9b29abf9-4ab0-4765-b253-1875cd9b441e - url: 'http://www.openwall.com/lists/oss-security/2026/05/10/8' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2026/05/11/2' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2026:39547' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:39553' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:39878' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:68632' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:68685' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:68688' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:68693' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/security/cve/CVE-2026-8177' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2468684' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8177.json label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://www.cve.org/CVERecord?id=CVE-2026-8177' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-8177' tags: - nvd - csaf - vex - red-hat - cve.org epss: 0.00882 epssPercentile: 0.57505 ssvc: exploitation: none automatable: 'yes' technicalImpact: partial timestamp: '2026-05-11T16:34:46.706997Z' ingestedAt: '2026-07-16T02:48:54.904Z' --- ## Overview 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. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:68632** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68632) - **RHSA-2026:39547** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-07-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:39547) - **RHSA-2026:39878** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-07-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:39878) - **RHSA-2026:68688** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68688) - **RHSA-2026:39553** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-07-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:39553) - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7 · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8177.json) - **RHSA-2026:68685** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68685) - **RHSA-2026:68693** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68693)