CVE-2026-6321— fast-uri vulnerable to path traversal via percent-encoded dot segments

fast-uri vulnerable to path traversal via percent-encoded dot segments

fast-uri decoded percent-encoded path separators and dot segments before applying dot-segment removal in its normalize() and equal() functions. Encoded path data was treated like real slashes and parent-directory references, so distinct URIs could collapse onto the same normalized path. Applications that normalize or compare attacker-controlled URLs to enforce path-based policy can be bypassed, with a path that appears confined under an allowed prefix normalizing to a different location. Versions <= 3.1.0 are affected. Update to 3.1.1 or later.

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

对路径名的限制不恰当(路径遍历)

fast-uri 路径遍历漏洞

fast-uri是Fastify开源的一个无依赖的RFC 3986 URI解析与工具箱。 fast-uri 3.1.0及之前版本存在路径遍历漏洞，该漏洞源于normalize()和equal()函数在应用点段移除之前解码百分比编码的路径分隔符和点段，编码的路径数据被视为真实斜杠和父目录引用，导致不同URI可能折叠到相同规范化路径，可能绕过基于路径的策略。

N/A

N/A