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High severity7.5NVD Advisory· Published May 4, 2026· Updated May 12, 2026

CVE-2026-6321

CVE-2026-6321

Description

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.

AI Insight

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
fast-urinpm
< 3.1.13.1.1

Affected products

58

Patches

Vulnerability mechanics

References

4

News mentions

0

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