What is CVE-2026-6321?

CVE-2026-6321 is a high-severity vulnerability in Fast-uri, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-05-04.

How severe is CVE-2026-6321?

High severity. CVSS v3 base score is 7.5 out of 10.

Path Traversal in Fast-uri

CVE-2026-6321

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 UR…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.000 (15.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Fast-uri — versions 0, 3.1.1
Openjsf Fast-uri

Weakness classification (CWE)

CWE-22 — Path Traversal

References

ce714d77-add3-4f53-aff5-83d477b104bb (Vendor Advisory)
ce714d77-add3-4f53-aff5-83d477b104bb (Vendor Advisory)

Frequently asked questions

What is CVE-2026-6321?: CVE-2026-6321 is a high-severity vulnerability in Fast-uri, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-05-04.
How severe is CVE-2026-6321?: High severity. CVSS v3 base score is 7.5 out of 10.