CVE-2021-41106

{"id": "CVE-2021-41106", "cveTags": [], "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 2.1, "accessVector": "LOCAL", "vectorString": "AV:L/AC:L/Au:N/C:N/I:P/A:N", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "NONE", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "LOW", "obtainAllPrivilege": false, "exploitabilityScore": 3.9, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.4, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 2.5, "exploitabilityScore": 1.8}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.3, "attackVector": "LOCAL", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 1.8}]}, "published": "2021-09-28T21:15:07.370", "references": [{"url": "https://github.com/lcobucci/jwt/commit/8175de5b841fbe3fd97d2d49b3fc15c4ecb39a73", "tags": ["Patch", "Third Party Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/lcobucci/jwt/commit/c45bb8b961a8e742d8f6b88ef5ff1bd5cca5d01c", "tags": ["Patch", "Third Party Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/lcobucci/jwt/security/advisories/GHSA-7322-jrq4-x5hf", "tags": ["Patch", "Third Party Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/lcobucci/jwt/commit/8175de5b841fbe3fd97d2d49b3fc15c4ecb39a73", "tags": ["Patch", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://github.com/lcobucci/jwt/commit/c45bb8b961a8e742d8f6b88ef5ff1bd5cca5d01c", "tags": ["Patch", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://github.com/lcobucci/jwt/security/advisories/GHSA-7322-jrq4-x5hf", "tags": ["Patch", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-345"}]}, {"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-345"}]}], "descriptions": [{"lang": "en", "value": "JWT is a library to work with JSON Web Token and JSON Web Signature. Prior to versions 3.4.6, 4.0.4, and 4.1.5, users of HMAC-based algorithms (HS256, HS384, and HS512) combined with `Lcobucci\\JWT\\Signer\\Key\\LocalFileReference` as key are having their tokens issued/validated using the file path as hashing key - instead of the contents. The HMAC hashing functions take any string as input and, since users can issue and validate tokens, users are lead to believe that everything works properly. Versions 3.4.6, 4.0.4, and 4.1.5 have been patched to always load the file contents, deprecated the `Lcobucci\\JWT\\Signer\\Key\\LocalFileReference`, and suggest `Lcobucci\\JWT\\Signer\\Key\\InMemory` as the alternative. As a workaround, use `Lcobucci\\JWT\\Signer\\Key\\InMemory` instead of `Lcobucci\\JWT\\Signer\\Key\\LocalFileReference` to create the instances of one's keys."}, {"lang": "es", "value": "JWT es una biblioteca para trabajar con JSON Web Token y JSON Web Signature. Antes de las versiones 3.4.6, 4.0.4 y 4.1.5, los usuarios de los algoritmos basados en HMAC (HS256, HS384 y HS512) combinados con \"Lcobucci\\JWT\\Signer\\Key\\LocalFileReference\" como clave est\u00e1n emitiendo/validando sus tokens usando la ruta del archivo como clave de hashing - en lugar del contenido. Las funciones de hashing HMAC aceptan cualquier cadena como entrada y, dado que los usuarios pueden emitir y comprobar tokens, los usuarios son llevados a creer que todo funciona correctamente. Las versiones 3.4.6, 4.0.4 y 4.1.5 han sido parcheadas para cargar siempre el contenido del archivo, desaprobando la funci\u00f3n \"Lcobucci\\JWT\\Signer\\Key\\LocalFileReference\", y sugiriendo \"Lcobucci\\JWT\\Signer\\Key\\InMemory\" como alternativa. Como soluci\u00f3n, use \"Lcobucci\\JWT\\SignerKey\\InMemory\" en lugar de \"Lcobucci\\JWT\\SignerKey\\LocalFileReference\" para crear las instancias de las claves propias"}], "lastModified": "2025-11-18T14:00:59.213", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:lcobucci:jwt:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AF6933FC-B9E6-4498-A663-9618B7F5E158", "versionEndExcluding": "3.4.6", "versionStartIncluding": "3.4.0"}, {"criteria": "cpe:2.3:a:lcobucci:jwt:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5250E671-1C8D-4CCB-B1AD-CD5718CC414B", "versionEndExcluding": "4.0.4", "versionStartIncluding": "4.0.0"}, {"criteria": "cpe:2.3:a:lcobucci:jwt:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "42710912-3F0E-4E89-ADB3-AF983D3323A2", "versionEndExcluding": "4.1.5", "versionStartIncluding": "4.1.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}