CVE-2025-59936

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{"affected": [{"affectedData": [{"product": "get-jwks", "vendor": "nearform", "versions": [{"status": "affected", "version": "< 11.0.2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "get-jwks contains fetch utils for JWKS keys. In versions prior to 11.0.2, a vulnerability in get-jwks can lead to cache poisoning in the JWKS key-fetching mechanism. When the iss (issuer) claim is validated only after keys are retrieved from the cache, it is possible for cached keys from an unexpected issuer to be reused, resulting in a bypass of issuer validation. This design flaw enables a potential attack where a malicious actor crafts a pair of JWTs, the first one ensuring that a chosen public key is fetched and stored in the shared JWKS cache, and the second one leveraging that cached key to pass signature validation for a targeted iss value. The vulnerability will work only if the iss validation is done after the use of get-jwks for keys retrieval. This issue has been patched in version 11.0.2."}, {"lang": "es", "value": "get-jwks contiene utilidades de obtenci\u00f3n para claves JWKS. En versiones anteriores a la 11.0.2, una vulnerabilidad en get-jwks puede conducir al envenenamiento de cach\u00e9 en el mecanismo de obtenci\u00f3n de claves JWKS. Cuando la declaraci\u00f3n 'iss' (emisor) se valida solo despu\u00e9s de que las claves se recuperan de la cach\u00e9, es posible que claves almacenadas en cach\u00e9 de un emisor inesperado sean reutilizadas, lo que resulta en una omisi\u00f3n de la validaci\u00f3n del emisor. Este fallo de dise\u00f1o permite un ataque potencial donde un actor malicioso crea un par de JWTs, el primero asegurando que una clave p\u00fablica elegida sea obtenida y almacenada en la cach\u00e9 JWKS compartida, y el segundo aprovechando esa clave almacenada en cach\u00e9 para pasar la validaci\u00f3n de firma para un valor 'iss' objetivo. La vulnerabilidad funcionar\u00e1 solo si la validaci\u00f3n de 'iss' se realiza despu\u00e9s del uso de get-jwks para la recuperaci\u00f3n de claves. Este problema ha sido parcheado en la versi\u00f3n 11.0.2."}], "id": "CVE-2025-59936", "lastModified": "2026-10-09T10:10:00.193", "metrics": {"cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 9.4, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L", "version": "3.0"}, "exploitabilityScore": 3.9, "impactScore": 5.5, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-59936", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-09-29T14:54:57.310485Z", "version": "2.0.3"}}]}, "published": "2025-09-27T01:15:43.590", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/nearform/get-jwks/commit/1706a177a80a1759fe68e3339dc5a219ce03ddb9"}, {"source": "security-advisories@github.com", "url": "https://github.com/nearform/get-jwks/security/advisories/GHSA-qc2q-qhf3-235m"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-116"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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{"created": "2025-09-29T09:29:51.401952+00:00", "updated": "2025-09-29T09:29:51.402010+00:00", "vendors": ["nearform", "nearform$PRODUCT$get-jwks"]}