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Vulnerabilities CVE-2026-33526

CVE-2026-33526

Critical
Open
TLP:CLEAR

Squid vulnerable to Denial of Service in ICP Request handling

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Description

Squid is a caching proxy for the Web. Prior to version 7.5, due to heap Use-After-Free, 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. Version 7.5 contains a patch.

Details

CVSS Score
9.2
EPSS Score
8.94%

94.8th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
Confidence
90%
Published
Mar 26, 2026
Last Modified
Jul 15, 2026
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