cvedb.io
CVE-2026-4923
MEDIUM · CVSS 5.9
EPSS exploitation probability: 0%
Published 2026-03-26T19:17:08.187 · Last modified 2026-06-17T10:57:27.740

Summary

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.

Affected products

pillarjs — path-to-regexp

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.