{"id":"DEBIAN-CVE-2026-4923","details":"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.","modified":"2026-09-01T16:06:48.037315465Z","published":"2026-03-26T19:17:08.187Z","upstream":["CVE-2026-4923"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-4923"}],"affected":[{"package":{"name":"node-path-to-regexp","ecosystem":"Debian:12","purl":"pkg:deb/debian/node-path-to-regexp?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-4923.json"}},{"package":{"name":"node-path-to-regexp","ecosystem":"Debian:13","purl":"pkg:deb/debian/node-path-to-regexp?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.3.0-1","8.3.0-1","8.4.0-1","8.4.1-1","8.4.2-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-4923.json"}},{"package":{"name":"node-path-to-regexp","ecosystem":"Debian:14","purl":"pkg:deb/debian/node-path-to-regexp?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.4.0-1"}]}],"versions":["6.3.0-1","8.3.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-4923.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}