CVE-2026-32748 — Squid has Denial of Service in ICP Response handling

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
squid-cache / squid	affected < 7.5

CWE

CWE-413, CWE-416, CWE-826

References

ADP enrichment

CVE

No English description supplied.

http://www.openwall.com/lists/oss-security/2026/03/25/3

CISA-ADP

No English description supplied.

No references supplied.

redhat-SADP

A flaw was found in Squid. A remote attacker can exploit this vulnerability by sending specially crafted ICP (Internet Cache Protocol) traffic. This can lead to a Denial of Service (DoS) due to premature resource release and use-after-free vulnerabilities. This attack is possible in Squid deployments with explicitly enabled ICP support.