Description

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.

INFO

Published Date :

2026-03-26T18:59:38.000Z

Last Modified :

2026-03-27T19:44:53.294Z

Source :

openjs
AFFECTED PRODUCTS

The following products are affected by CVE-2026-4926 vulnerability.

Vendors Products
Path-to-regexp
  • Path-to-regexp
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-4926.

URL Resource
https://cna.openjsf.org/security-advisories.html cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-4926 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-4926 cve-icon
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