GHSA-q3j6-qgpj-74h6

Source

https://github.com/advisories/GHSA-q3j6-qgpj-74h6

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-q3j6-qgpj-74h6/GHSA-q3j6-qgpj-74h6.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-q3j6-qgpj-74h6

Aliases

CVE-2026-6321

Downstream

CGA (211)

MINI (30)

Published

2026-05-08T17:15:09Z

Modified

2026-09-10T03:51:06Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator

Summary

fast-uri vulnerable to path traversal via percent-encoded dot segments

Details

Impact

fast-uri v3.1.0 and earlier decodes percent-encoded path separators (%2F) and dot segments (%2E) before applying dot-segment removal in normalize() and equal(). This makes encoded path data behave like real / and .., so distinct URIs collapse onto the same normalized path.

For example, http://example.com/public/%2e%2e/admin normalizes to http://example.com/admin, and equal() considers them the same URI.

Applications that normalize or compare attacker-controlled URLs to enforce path-based policy can be bypassed. A path that looks confined under an allowed prefix can normalize to a different location.

Patches

Upgrade to fast-uri >= 3.1.1, or if you are in the v2.x release line, v2.4.1

Workarounds

None. Upgrade to the patched version.

Database specific

{
    "cwe_ids":  [
        "CWE-22"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-05-08T17:15:09Z",
    "nvd_published_at":  "2026-05-04T20:16:20Z",
    "severity":  "HIGH"
}

References

Affected packages

npm / fast-uri

Package

Name: fast-uri; View open source insights on deps.dev
Purl: pkg:npm/fast-uri

Affected ranges

Type: SEMVER
Events: Introduced

3.0.0

Fixed

3.1.1

Database specific

last_known_affected_version_range

"<= 3.1.0"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-q3j6-qgpj-74h6/GHSA-q3j6-qgpj-74h6.json"