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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
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.
Metrics
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OR
*cpe:2.3:a:pillarjs:path-to-regexp:*:*:*:*:*:node.js:*:* versions from (including) 8.0.0 up to (excluding) 8.4.0
Added
Reference Type
openjs: https://cna.openjsf.org/security-advisories.html Types: Third Party Advisory
New CVE Received from openjs3/26/2026 3:17:08 PM
Action
Type
Old Value
New Value
Added
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.
Added
CVSS V3.1
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Added
CWE
CWE-400
Added
CWE
CWE-1333
Added
Reference
https://cna.openjsf.org/security-advisories.html
Quick Info
CVE Dictionary Entry: CVE-2026-4926 NVD
Published Date: 03/26/2026 NVD
Last Modified: 07/09/2026
Source: openjs
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