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5.9 Medium

CVE-2026-4923 Impact: When using multiple wildcards, combined with at least one parameter, a regular expression can be generated…

Description

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 and versions

Product Affected versions Fixed in
path-to-regexp 8.4 earliest → < 8.4.0 8.4.0
path-to-regexp 8.0 8.0.0 → < 8.4.0 8.4.0

References

Timeline

  1. Published
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Other CVEs of path-to-regexp

The 3 CVEs of path-to-regexp →
CVE-2026-4926 Impact: A bad regular expression is generated any time you have multiple sequential optional groups (curly brace… 7.5 High CVE-2026-4867 Impact: A bad regular expression is generated any time you have three or more parameters within a single segment,… 7.5 High
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