CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се по мрежата, при специфични условия, без вход и без действие от потребителя.
- Експлоатация: има публичен пример за експлоатация
- Атаката не може да се автоматизира
Описание
Оригинално описание
fast-jwt provides fast JSON Web Token (JWT) implementation. Prior to 6.3.1, fast-jwt createVerifier accepts an unsigned JWT when key is an empty string or null and algorithms is a non-empty allowlist. Falsy synchronous keys bypass prepareKeyOrSecret, allowedAlgorithms remains active, hasKey is false, and the empty signature avoids the verifySignature gate. An attacker can therefore submit a token containing arbitrary claims without possessing a signing key, resulting in authentication or authorization bypass. Claim validators still run, and non-empty keys, an empty key without algorithms, and the async key resolver path do not have this behavior. This issue is fixed in version 6.3.1.
Засегнати продукти
- nearform fast-jwt: < 6.3.1
Вид слабост
История
- 8 октомври 2026 Публикувано
Други уязвимости в nearform fast-jwt
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-107720
- https://nvd.nist.gov/vuln/detail/CVE-2026-107720
- https://github.com/nearform/fast-jwt/security/advisories/GHSA-8wpc-h4q6-8fxv
- https://github.com/nearform/fast-jwt/pull/649
- https://github.com/nearform/fast-jwt/commit/e22a151e83bf6d5e54e281216982d204d5665534
- https://github.com/nearform/fast-jwt/releases/tag/v6.3.1