CVE-2021-40900: Regexfn Project Regexfn

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

A Regular Expression Denial of Service (ReDOS) vulnerability was discovered in regexfn v1.0.5 when validating crafted invalid emails.

Affected products

• Regexfn Project Regexfn: version 1.0.5 only

Published 2022-06-27. Last modified 2026-06-17.