Squid Improper Resource Locking Vulnerability - CVE-2026-32748

Squid is a caching proxy for the Web. Prior to version 7.5 due to premature release of resource during expected lifetime and heap Use-After-Free bugs Squid is vulnerable to Denial of Service when handling ICP traffic. This problem allows a remote attacker to perform a reliable and repeatable Denial of Service attack against the Squid service using ICP protocol. This attack is limited to Squid deployments that explicitly enable ICP support (i.e. configure non-zero icp_port). This problem _cannot_ be mitigated by denying ICP queries using icp_access rules. This bug is fixed in Squid version 7.5.