GHSA-q3j6-qgpj-74h6

Suggest an improvement
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
Related
Published
2026-05-08T17:15:09Z
Modified
2026-05-09T16:44:22.524341929Z
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.

Workarounds

None. Upgrade to the patched version.

Database specific 
{
    "github_reviewed_at": "2026-05-08T17:15:09Z",
    "cwe_ids": [
        "CWE-22"
    ],
    "severity": "HIGH",
    "github_reviewed": true,
    "nvd_published_at": "2026-05-04T20:16:20Z"
}
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
0Unknown introduced version / All previous versions are affected
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"