CVE-2026-6321 (GCVE-0-2026-6321)
Vulnerability from cvelistv5 – Published: 2026-05-04 19:31 – Updated: 2026-05-04 19:31
VLAI?
Title
fast-uri vulnerable to path traversal via percent-encoded dot segments
Summary
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.
Severity ?
7.5 (High)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
Credits
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"version": "0",
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"type": "reporter",
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"type": "remediation developer",
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{
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}
],
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}
],
"metrics": [
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"version": "3.1"
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"problemTypes": [
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"cweId": "CWE-22",
"description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
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"type": "CWE"
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"providerMetadata": {
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"orgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
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"references": [
{
"url": "https://github.com/fastify/fast-uri/security/advisories/GHSA-q3j6-qgpj-74h6"
},
{
"url": "https://cna.openjsf.org/security-advisories.html"
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"title": "fast-uri vulnerable to path traversal via percent-encoded dot segments",
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"datePublished": "2026-05-04T19:31:57.253Z",
"dateReserved": "2026-04-14T20:23:01.545Z",
"dateUpdated": "2026-05-04T19:31:57.253Z",
"state": "PUBLISHED"
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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