{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-107724", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-08T17:21:52.976Z", "datePublished": "2026-10-08T21:53:01.909Z", "dateUpdated": "2026-10-08T21:53:01.909Z"}, "containers": {"cna": {"title": "fast-jwt treats raw public JWK JSON as an HMAC secret, enabling HS256 token forgery", "problemTypes": [{"descriptions": [{"cweId": "CWE-347", "lang": "en", "description": "CWE-347: Improper Verification of Cryptographic Signature", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/nearform/fast-jwt/security/advisories/GHSA-g3jj-5cmm-3hxx", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/nearform/fast-jwt/security/advisories/GHSA-g3jj-5cmm-3hxx"}, {"name": "https://github.com/nearform/fast-jwt/pull/636", "tags": ["x_refsource_MISC"], "url": "https://github.com/nearform/fast-jwt/pull/636"}, {"name": "https://github.com/nearform/fast-jwt/commit/10f9591349199ed2ab9fa1748ce92cdca697f6cf", "tags": ["x_refsource_MISC"], "url": "https://github.com/nearform/fast-jwt/commit/10f9591349199ed2ab9fa1748ce92cdca697f6cf"}, {"name": "https://github.com/nearform/fast-jwt/releases/tag/v6.3.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/nearform/fast-jwt/releases/tag/v6.3.0"}], "affected": [{"vendor": "nearform", "product": "fast-jwt", "versions": [{"version": ">= 6.2.4, < 6.3.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-08T21:53:01.909Z"}, "descriptions": [{"lang": "en", "value": "fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.2.4, fast-jwt can classify raw serialized public JWK or JWKS JSON as an HMAC secret because src/crypto.js performDetectPublicKeyAlgorithms treats non-PEM strings as symmetric key material. If HS256 is explicitly allowed or inferred, an attacker who knows the exact serialized public-key bytes can use those bytes as an HMAC key and create a token containing arbitrary claims that createVerifier accepts. Serialization ordering or whitespace differences can prevent exploitation, and applications using supported PEM keys with an asymmetric-only algorithm allowlist are not affected. This issue is fixed in version 6.3.0."}], "source": {"advisory": "GHSA-g3jj-5cmm-3hxx", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "fast-jwt", "vendor": "nearform", "versions": [{"status": "affected", "version": ">= 6.2.4, < 6.3.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.2.4, fast-jwt can classify raw serialized public JWK or JWKS JSON as an HMAC secret because src/crypto.js performDetectPublicKeyAlgorithms treats non-PEM strings as symmetric key material. If HS256 is explicitly allowed or inferred, an attacker who knows the exact serialized public-key bytes can use those bytes as an HMAC key and create a token containing arbitrary claims that createVerifier accepts. Serialization ordering or whitespace differences can prevent exploitation, and applications using supported PEM keys with an asymmetric-only algorithm allowlist are not affected. This issue is fixed in version 6.3.0."}], "id": "CVE-2026-107724", "lastModified": "2026-10-08T22:17:28.930", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-10-08T22:17:28.800", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/nearform/fast-jwt/commit/10f9591349199ed2ab9fa1748ce92cdca697f6cf"}, {"source": "security-advisories@github.com", "url": "https://github.com/nearform/fast-jwt/pull/636"}, {"source": "security-advisories@github.com", "url": "https://github.com/nearform/fast-jwt/releases/tag/v6.3.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/nearform/fast-jwt/security/advisories/GHSA-g3jj-5cmm-3hxx"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-347"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}