CVE-2023-49288: Squid-Cache Squid

High severity, CVSS 7.5. EPSS: 4.8% chance of exploitation in the next 30 days.

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Affected versions of squid are subject to a a Use-After-Free bug which can lead to a Denial of Service attack via collapsed forwarding. All versions of Squid from 3.5 up to and including 5.9 configured with "collapsed_forwarding on" are vulnerable. Configurations with "collapsed_forwarding off" or without a "collapsed_forwarding" directive are not vulnerable. This bug is fixed by Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade should remove all collapsed_forwarding lines from their squid.conf.

Affected products

• Squid-Cache Squid: from 3.5, up to and including 5.9

Published 2023-12-04. Last modified 2026-06-17.