CVE-2026-33526
HIGHSquid vulnerable to Denial of Service in ICP Request handling
Title source: cnaDescription
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.
References (3)
Scores
CVSS v3
7.5
EPSS
0.0214
EPSS Percentile
84.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-416
CWE-826
Status
published
Products (1)
squid-cache/squid
< 7.5 (2 CPE variants)
Published
Mar 26, 2026
Tracked Since
Mar 26, 2026