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CVE-2026-4923

CVE-2026-4923 · path-to-regexp vulnerable to Regular Expression Denial of Service via multiple wildcards

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

Impact: When using multiple wildcards, combined with at least one parameter, a regular expression can be generated that is vulnerable to ReDoS. This backtracking vulnerability requires the second wildcard to be somewhere other than the end of the path. Unsafe examples: /*foo-*bar-:baz /*a-:b-*c-:d /x/*a-:b/*c/y Safe examples: /*foo-:bar /*foo-:bar-*baz Patches: Upgrade to version 8.4.0. Workarounds: If you are using multiple wildcard parameters, you can check the regex output with a tool such as https://makenowjust-labs.github.io/recheck/playground/ to confirm whether a path is vulnerable.

CVSS 5.9 · Medium · EPSS 0.4% · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • path-to-regexp

    Versions
    • ≥ 8.0.0, < 8.4.0: Affected (semver)
    • 8.4.0: Not affected (semver)

    Update to 8.4.0

  • node-path-to-regexp Debian:12

    Versions
    • 6.2.1-1
    • 6.3.0-1
    • 8.3.0-1
    • 8.4.0-1
    • 8.4.1-1
    • 8.4.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-path-to-regexp Debian:13

    Versions
    • 6.3.0-1
    • 8.3.0-1
    • 8.4.0-1
    • 8.4.1-1
    • 8.4.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-path-to-regexp Debian:14

    Versions
    • 6.3.0-1
    • 8.3.0-1
    Affected ranges
    • ECOSYSTEM: < 8.4.0-1

    Update to 8.4.0-1

  • path-to-regexp npm

    Affected ranges
    • SEMVER: ≥ 8.0.0, < 8.4.0

    Update to 8.4.0

Original sources

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