CVE-2026-33526

7.5 HIGH
Published: March 26, 2026 Modified: March 31, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/squid-cache/squid/security/advisories/GHSA-hpfx-h48q-gvwg
Source: security-advisories@github.com
Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/03/25/2
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory

3 reference(s) from NVD

Quick Stats

CVSS v3 Score
7.5 / 10.0
EPSS (Exploit Probability)
1.7%
82th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

squid-cache