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

Description (CNA)

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 (CNA)

Vendor / product	Versions
path-to-regexp / path-to-regexp	affected 8.0.0 before 8.4.0; unaffected 8.4.0

CWE

CWE-1333

References

https://cna.openjsf.org/security-advisories.html

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.