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CVE-2026-6321

CVE-2026-6321 · fast-uri vulnerable to path traversal via percent-encoded dot segments

This page contains facts from public vulnerability sources. Check the original advisory before updating.

This page shows selected source facts. See the linked advisories for the complete description and affected versions.

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.

CVSS 7.5 · High · EPSS 0.8% · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • fast-uri

    Versions
    • ≥ 0, < 3.1.1: Affected (semver)
    • 3.1.1: Not affected (semver)

    Update to 3.1.1

  • node-ajv Debian:12

    Versions
    • 6.12.6-3
    • 8.11.2~ds+~2.1.1-1
    • 8.12.0~ds+~2.1.1-1
    • 8.12.0~ds+~2.1.1-2
    • 8.12.0~ds+~2.1.1-3
    • 8.12.0~ds+~2.1.1-4
    • 8.12.0~ds+~2.1.1-5
    • 8.17.1~ds+~3.0.1+~3.1.0-1
    • 8.17.1~ds+~3.0.1+~3.1.0-2
    • 8.17.1~ds+~3.0.1+~3.1.0-3
    • 8.17.1~ds+~3.0.1+~3.1.0-4
    • 8.18.0~ds+~cs6.1.1-1
    • 8.18.0~ds+~cs6.1.1-2
    • 8.20.0~ds+~cs6.1.3-1
    • 8.20.0~ds+~cs7.1.2-1
    • 8.20.0~ds+~cs7.1.3-1
    • 8.20.0~ds+~cs7.1.3-2
    • 8.20.0~ds+~cs7.1.3-3
    • 8.20.0~ds+~cs7.1.4-1
    • 8.20.0~ds+~cs7.1.5-1
    • 8.20.0~ds+~cs7.1.6-1
    • 8.8.2~ds+~2.1.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-ajv Debian:13

    Versions
    • 8.12.0~ds+~2.1.1-5
    • 8.17.1~ds+~3.0.1+~3.1.0-1
    • 8.17.1~ds+~3.0.1+~3.1.0-2
    • 8.17.1~ds+~3.0.1+~3.1.0-3
    • 8.17.1~ds+~3.0.1+~3.1.0-4
    • 8.18.0~ds+~cs6.1.1-1
    • 8.18.0~ds+~cs6.1.1-2
    • 8.20.0~ds+~cs6.1.3-1
    • 8.20.0~ds+~cs7.1.2-1
    • 8.20.0~ds+~cs7.1.3-1
    • 8.20.0~ds+~cs7.1.3-2
    • 8.20.0~ds+~cs7.1.3-3
    • 8.20.0~ds+~cs7.1.4-1
    • 8.20.0~ds+~cs7.1.5-1
    • 8.20.0~ds+~cs7.1.6-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-ajv Debian:14

    Versions
    • 8.12.0~ds+~2.1.1-5
    • 8.17.1~ds+~3.0.1+~3.1.0-1
    • 8.17.1~ds+~3.0.1+~3.1.0-2
    • 8.17.1~ds+~3.0.1+~3.1.0-3
    • 8.17.1~ds+~3.0.1+~3.1.0-4
    • 8.18.0~ds+~cs6.1.1-1
    • 8.18.0~ds+~cs6.1.1-2
    Affected ranges
    • ECOSYSTEM: < 8.20.0~ds+~cs6.1.3-1

    Update to 8.20.0~ds+~cs6.1.3-1

  • fast-uri npm

    Affected ranges
    • SEMVER: ≥ 3.0.0, < 3.1.1

    Update to 3.1.1

  • fast-uri npm

    Affected ranges
    • SEMVER: < 2.4.1

    Update to 2.4.1

  • node-ajv Ubuntu:18.04:LTS

    Versions
    • 5.0.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-ajv Ubuntu:20.04:LTS

    Versions
    • 6.10.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-ajv Ubuntu:22.04:LTS

    Versions
    • 6.12.6-2
    • 6.12.6-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-ajv Ubuntu:24.04:LTS

    Versions
    • 6.12.6-3
    • 8.12.0~ds+~2.1.1-4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-ajv Ubuntu:25.10

    Versions
    • 8.12.0~ds+~2.1.1-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-ajv Ubuntu:26.10

    Versions
    • 8.17.1~ds+~3.0.1+~3.1.0-4build1
    • 8.20.0~ds+~cs6.1.3-1
    • 8.20.0~ds+~cs7.1.2-1
    • 8.20.0~ds+~cs7.1.3-1
    • 8.20.0~ds+~cs7.1.3-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-ajv Ubuntu:26.04:LTS

    Versions
    • 8.12.0~ds+~2.1.1-5
    • 8.17.1~ds+~3.0.1+~3.1.0-2
    • 8.17.1~ds+~3.0.1+~3.1.0-4build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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