#VU124610 Use After Free in Squid - CVE-2026-33526

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Main Vulnerability Database Vulnerabilities #VU124610

#VU124610 Use After Free in Squid - CVE-2026-33526

Published: March 25, 2026


Vulnerability identifier: #VU124610
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-33526
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Squid
Software vendor:
Squid-cache.org

Description

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to heap use-after-free in ICP request handling when processing ICP traffic. A remote attacker can send a specially crafted ICP request to cause a denial of service.

The attack is limited to Squid deployments that have ICP support enabled via a non-zero icp_port configuration.


Remediation

Install security update from vendor's website.

External links