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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "libxml2", "vendor": "xmlsoft", "versions": [{"lessThan": "2.15.4", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "cve@mitre.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In libxml2 before 2.15.4, there is a heap-based buffer overflow in xmlXPtrEvalXPtrPart because of xmlXPtrEval xpointer length saturation."}], "id": "CVE-2026-86142", "lastModified": "2026-09-08T21:14:09.040", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L", "version": "3.1"}, "exploitabilityScore": 1.4, "impactScore": 5.5, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-09-05T05:17:13.133", "references": [{"source": "cve@mitre.org", "url": "https://github.com/GNOME/libxml2/commit/6b3a736c0edc74ceec3d82f5252499d7911b3a58"}, {"source": "cve@mitre.org", "url": "https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4"}, {"source": "cve@mitre.org", "url": "https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1113"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "cve@mitre.org", "type": "Primary"}]}

{"bugzilla": {"description": "libxml2: libxml2: Heap-based buffer overflow in xmlXPtrEval due to xpointer length saturation", "id": "2528990", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2528990"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.9", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L", "status": "draft"}, "cwe": "CWE-805", "details": ["A flaw was found in libxml2. A local attacker could exploit a heap-based buffer overflow in the `xmlXPtrEvalXPtrPart` function. This vulnerability occurs due to an integer overflow when processing an oversized `xpointer()` expression, leading to incorrect memory allocation and an out-of-bounds write. Successful exploitation could result in information disclosure, data corruption, or a denial of service."], "name": "CVE-2026-86142", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "libxml2", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "swift-lang", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-09-05T04:29:33Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-86142\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-86142\nhttps://github.com/GNOME/libxml2/commit/6b3a736c0edc74ceec3d82f5252499d7911b3a58\nhttps://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4\nhttps://gitlab.gnome.org/GNOME/libxml2/-/work_items/1113"], "threat_severity": "Moderate"}