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.

PUBLISHED Reserved 2026-04-14 | Published 2026-05-04 | Updated 2026-05-05 | Assigner openjs

Problem types

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Product status

Credits

Jvr reporter

Matteo Collina remediation developer

Ulises Gascón remediation reviewer

KaKa remediation reviewer

References

github.com/...st-uri/security/advisories/GHSA-q3j6-qgpj-74h6

cna.openjsf.org/security-advisories.html

cve.org (CVE-2026-6321)

nvd.nist.gov (CVE-2026-6321)

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