node-path-to-regexp: Impact: A bad regular expression is generated any time you have multiple sequential optional groups (curly brace syn...
CVE-2026-4926 is fixed in node-path-to-regexp on 1 platform by DEBIAN-CVE-2026-4926 (version 8.4.0-1), released March 26, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| node-path-to-regexp · Debian 14 | 8.4.0-1 | DEBIAN-CVE-2026-4926 | Mar 26, 2026 |
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