{"id":"DEBIAN-CVE-2026-4926","details":"Impact:  A bad regular expression is generated any time you have multiple sequential optional groups (curly brace syntax), such as `{a}{b}{c}:z`. The generated regex grows exponentially with the number of groups, causing denial of service.  Patches:  Fixed in version 8.4.0.  Workarounds:  Limit the number of sequential optional groups in route patterns. Avoid passing user-controlled input as route patterns.","modified":"2026-09-10T08:47:22.786111941Z","published":"2026-03-26T19:17:08.387Z","upstream":["CVE-2026-4926"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-4926"}],"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-2026-4926.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-2026-4926.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-2026-4926.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}