GHSA-q3j6-qgpj-74h6 · Severity: high · Ecosystem: npm — fast-uri vulnerable to path traversal via percent-encoded dot segments
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.
Conclusion & alert: CVE-2026-6321 is rated Low Risk (32.9/100): CVSS High severity, with low exploitation likelihood (EPSS 0.03%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-05-05 | — | 0.03% | — |
Full EPSS history (1 record total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | ce714d77-add3-4f53-aff5-83d477b104bb |
GHSA-q3j6-qgpj-74h6 · Severity: high · Ecosystem: npm — fast-uri vulnerable to path traversal via percent-encoded dot segments
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
unimportant | CVE-2026-6321 unimportant priority: Debian including 1 source packages (node-ajv), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. | https://security-tracker.debian.org/tracker/CVE-2026-6321 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2026-6321 |
suse
|
high | — | https://www.suse.com/security/cve/CVE-2026-6321/ |
ubuntu
|
medium | CVE-2026-6321 medium priority: Ubuntu including 1 source packages (node-ajv), 7 status rows across 7 suites (bionic, focal, jammy, noble, questing, resolute, upstream): needs-triage 7. | https://ubuntu.com/security/CVE-2026-6321 |
| URL | Tags |
|---|---|
| https://cna.openjsf.org/security-advisories.html | Vendor Advisory |
| https://github.com/fastify/fast-uri/security/advisories/GHSA-q3j6-qgpj-74h6 | Vendor Advisory |