Bug 2451574 (CVE-2026-33526) - CVE-2026-33526 squid: Squid: Denial of Service via heap Use-After-Free vulnerability in ICP handling
Summary: CVE-2026-33526 squid: Squid: Denial of Service via heap Use-After-Free vulner...
Keywords:
Status: NEW
Alias: CVE-2026-33526
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
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Depends On: 2451598 2451599
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-26 01:01 UTC by OSIDB Bzimport
Modified: 2026-03-26 05:14 UTC (History)
0 users

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Description OSIDB Bzimport 2026-03-26 01:01:40 UTC 
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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