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CVE Vendors Products Updated CVSS v3.1
CVE-2026-4926 2 Path-to-regexp, Pillarjs 2 Path-to-regexp, Path-to-regexp 2026-04-16 7.5 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.