ReDoS in fast-jwt when using RegExp in allowed* leading to CPU exhaustion during token verification

fast-jwt provides fast JSON Web Token (JWT) implementation. From 5.0.0 to 6.2.0, a denial-of-service condition exists in fast-jwt when the allowedAud verification option is configured using a regular expression. Because the aud claim is attacker-controlled and the library evaluates it against the supplied RegExp, a crafted JWT can trigger catastrophic backtracking in the JavaScript regex engine, resulting in significant CPU consumption during verification. This vulnerability is fixed in 6.2.1.

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H

CWE-1333

fast-jwt 安全漏洞

fast-jwt是Nearform开源的一个 JSON Web Token 实现。 fast-jwt 6.2.0及之前版本存在安全漏洞，该漏洞源于allowedAud验证选项使用正则表达式时，攻击者控制的aud声明可能触发灾难性回溯，导致验证期间CPU消耗过高。

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