GHSA-27v5-c462-wpq7

ghsaUSosv

path-to-regexp vulnerable to Regular Expression Denial of Service via multiple wildcards

view advisory published 2026-03-27Licence: CC-BY-4.0

### 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 developers are using multiple wildcard parameters, they can check the regex output with a tool such as https://makenowjust-labs.github.io/recheck/playground/ to confirm whether a path is vulnerable.

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describes (1)

Related CVEs.

IDseverity exploitable
CVE-2026-4923US——
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 req…
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references

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