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high7.5

CVE-2026-6321

fast-uri decoded percent-encoded path separators and dot segments before applying dot-segment removal in its normalize() and equal() functions.

Impact

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.

Affected packages

EcosystemPackageAffectedFixed in
npmfast-uri>= 3.0.0, <= 3.1.03.1.1

Affected products

VendorProductAffected versions
OpenjsfFast-Uri
before 3.1.1

Weakness classification

CWE-22

References