{"id":"CVE-2026-113351","title":"libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset","summary":"libexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the …","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-909","CWE-459"],"vendor":"libexpat","product":"libexpat","affected":["libexpat >= 2.7.2 <= 2.9.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-20T15:10:35.530839Z"},"published":"2026-10-20","updated":"2026-10-20","sourceUpdated":"2026-10-20T16:06:48.218Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-113351","references":[{"url":"https://github.com/libexpat/libexpat/pull/1431"},{"url":"https://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L860-L884"},{"url":"https://github.com/libexpat/libexpat/blob/a76b1174c1ea52abb639a4c69d52b630a8a106a2/expat/lib/xmlparse.c#L1560"},{"url":"https://github.com/libexpat/libexpat"},{"url":"https://www.vulncheck.com/advisories/libexpat-2.7.2-through-2.9.0-denial-of-service-via-xml-parserreset","label":"VulnCheck Advisory: libexpat 2.7.2 through 2.9.0 Denial of Service via XML_ParserReset"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-113351.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-113351"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2556110"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-113351"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-113351"}],"tags":["cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-10-20T12:05:07.320Z","epss":0.00474,"epssPercentile":0.40787,"slug":"CVE-2026-113351","body":"## Overview\n\nlibexpat 2.7.2 through 2.9.0 contains a denial of service vulnerability because XML_ParserReset zeroes the direct byte count but never offsets tracked heap allocations. Attackers can submit a large XML document so later documents on the same reset parser fail with XML_ERROR_NO_MEMORY until it is recreated.\n\n## Affected\n\n- `libexpat >= 2.7.2 <= 2.9.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · 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, Red Hat Hardened Images, … · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-113351.json)","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}