{"id":"CVE-2026-45186","title":"In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.","summary":"In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.","severity":"low","cvss":2.9,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-407"],"vendor":"libexpat_project","product":"libexpat","affected":["libexpat < 2.8.1"],"patched":["libexpat 2.8.1"],"published":"2026-05-10","updated":"2026-09-16","sourceUpdated":"2026-09-16T13:17:58.967","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-45186","references":[{"url":"https://github.com/libexpat/libexpat/pull/1216","label":"cve@mitre.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/05/11/16","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2026:22715","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:22721","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:23230","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:26319","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:27201","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:29197","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:58981","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-45186","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2468575","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45186.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-45186"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45186"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.0046,"epssPercentile":0.39161,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-05-11T15:01:28.359121Z"},"ingestedAt":"2026-09-16T12:55:21.869Z","scores":{"nvd":2.9,"vendor":7.5},"slug":"CVE-2026-45186","body":"## Overview\n\nIn libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.\n\n## Affected\n\n- `libexpat < 2.8.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `libexpat 2.8.1`\n\n## Vendor advisories\n\n- **RHSA-2026:22715** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-06-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:22715)\n- **RHSA-2026:23230** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9) · released 2026-06-04 · [advisory](https://access.redhat.com/errata/RHSA-2026:23230)\n- **RHSA-2026:22721** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8) · released 2026-06-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:22721)\n- **RHSA-2026:29197** · Red Hat · fixed in: Red Hat Discovery 2 · released 2026-06-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:29197)\n- **RHSA-2026:27201** · Red Hat · fixed in: Red Hat JBoss Core Services 2.4.62.SP4 · released 2026-06-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:27201)\n- **RHSA-2026:58981** · Red Hat · fixed in: Red Hat Update Infrastructure 5 · released 2026-08-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:58981)\n- **RHSA-2026:26319** · Red Hat · fixed in: Red Hat Update Infrastructure 5 · released 2026-06-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:26319)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45186.json)","depth":"sunlit","depthScore":16,"depthScoreParts":{"impact":16,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}