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Vulnerability DatabaseCVE-2026-4926
CVE-2026-4926:
JavaScript vulnerability analysis and mitigation
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.
Source: NVD
Related JavaScript vulnerabilities:
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