CVE-2021-23406: Pac-Resolver Project Pac-Resolver

Critical severity, CVSS 9.8. EPSS: 2.9% chance of exploitation in the next 30 days.

This affects the package pac-resolver before 5.0.0. This can occur when used with untrusted input, due to unsafe PAC file handling. **NOTE:** The fix for this vulnerability is applied in the node-degenerator library, a dependency written by the same maintainer.

Affected products

• Pac-Resolver Project Pac-Resolver: before 5.0.0 (fixed in 5.0.0)

Published 2021-08-24. Last modified 2026-06-17.