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.
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
Impacted products
Vendor Product Version
fast-uri fast-uri Affected: 0 , < 3.1.1 (semver)
Unaffected: 3.1.1 (semver)
Create a notification for this product.
Credits
Jvr Matteo Collina Ulises Gascón KaKa
Show details on NVD website

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        },
        {
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          "type": "remediation reviewer",
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        },
        {
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          "type": "remediation reviewer",
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        }
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        }
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          "url": "https://github.com/fastify/fast-uri/security/advisories/GHSA-q3j6-qgpj-74h6"
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    "cveId": "CVE-2026-6321",
    "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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}


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