CVE-2025-66578

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{"affected": [{"affectedData": [{"product": "xmlseclibs", "vendor": "robrichards", "versions": [{"status": "affected", "version": "< 3.1.4"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:xmlseclibs_project:xmlseclibs:*:*:*:*:*:*:*:*", "matchCriteriaId": "F6F18E09-4040-42AD-8BAD-E9186E79B968", "versionEndExcluding": "3.1.4", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "xmlseclibs is a library written in PHP for working with XML Encryption and Signatures. Versions 3.1.3 contain an authentication bypass vulnerability due to a flaw in the libxml2 canonicalization process during document transformation. When libxml2\u2019s canonicalization is invoked on an invalid XML input, it may return an empty string rather than a canonicalized node. xmlseclibs then proceeds to compute the DigestValue over this empty string, treating it as if canonicalization succeeded. This issue is fixed in version 3.1.4. Workarounds include treating canonicalization failures (exceptions or nil/empty outputs) as fatal and aborting validation, and/or adding explicit checks to reject when canonicalize returns nil/empty or raises errors."}, {"lang": "es", "value": "xmlseclibs es una biblioteca escrita en PHP para trabajar con Cifrado y Firmas XML. Las versiones 3.1.3 contienen una vulnerabilidad de omisi\u00f3n de autenticaci\u00f3n debido a un fallo en el proceso de canonicalizaci\u00f3n de libxml2 durante la transformaci\u00f3n de documentos. Cuando la canonicalizaci\u00f3n de libxml2 es invocada en una entrada XML inv\u00e1lida, puede devolver una cadena vac\u00eda en lugar de un nodo canonicalizado. xmlseclibs entonces procede a calcular el DigestValue sobre esta cadena vac\u00eda, trat\u00e1ndola como si la canonicalizaci\u00f3n hubiera tenido \u00e9xito. Este problema est\u00e1 solucionado en la versi\u00f3n 3.1.4. Las soluciones provisionales incluyen tratar los fallos de canonicalizaci\u00f3n (excepciones o salidas nulas/vac\u00edas) como fatales y abortar la validaci\u00f3n, y/o a\u00f1adir comprobaciones expl\u00edcitas para rechazar cuando canonicalize devuelve nulo/vac\u00edo o genera errores."}], "id": "CVE-2025-66578", "lastModified": "2026-10-07T20:10:01.970", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.0, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 4.7, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-66578", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-12-09T15:24:31.684932Z", "version": "2.0.3"}}]}, "published": "2025-12-09T16:18:21.580", "references": [{"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://github.com/robrichards/xmlseclibs/blob/f4131320c6dcd460f1b0c67f16f8bf24ce4b5c3e/src/XMLSecurityDSig.php#L296"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/robrichards/xmlseclibs/commit/69fd63080bc47a8d51bc101c30b7cb756862d1d6"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/robrichards/xmlseclibs/security/advisories/GHSA-c4cc-x928-vjw9"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-248"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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