Detections
Analytics
CVE-2026-6321
high
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.
References
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6321.json
https://github.com/fastify/fast-uri/security/advisories/GHSA-q3j6-qgpj-74h6
https://cna.openjsf.org/security-advisories.html
https://bugzilla.redhat.com/show_bug.cgi?id=2466582
https://access.redhat.com/security/cve/CVE-2026-6321
https://access.redhat.com/errata/RHSA-2026:34342
https://access.redhat.com/errata/RHSA-2026:26420
https://access.redhat.com/errata/RHSA-2026:26416
https://access.redhat.com/errata/RHSA-2026:26234
https://access.redhat.com/errata/RHSA-2026:26214
https://access.redhat.com/errata/RHSA-2026:25123
https://access.redhat.com/errata/RHSA-2026:25089
https://access.redhat.com/errata/RHSA-2026:24977
https://access.redhat.com/errata/RHSA-2026:24866
https://access.redhat.com/errata/RHSA-2026:24766
https://access.redhat.com/errata/RHSA-2026:24473
https://access.redhat.com/errata/RHSA-2026:21338