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:
Whiteboard:
Depends On: 2451598 2451599
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-26 01:01 UTC by OSIDB Bzimport
Modified: 2026-04-29 20:22 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:10255 0 None None None 2026-04-24 01:03:00 UTC
Red Hat Product Errata RHSA-2026:10256 0 None None None 2026-04-23 23:08:10 UTC
Red Hat Product Errata RHSA-2026:10257 0 None None None 2026-04-23 23:04:39 UTC
Red Hat Product Errata RHSA-2026:11901 0 None None None 2026-04-29 20:22:49 UTC
Red Hat Product Errata RHSA-2026:6301 0 None None None 2026-03-31 20:03:42 UTC
Red Hat Product Errata RHSA-2026:8119 0 None None None 2026-04-14 15:05:10 UTC
Red Hat Product Errata RHSA-2026:8317 0 None None None 2026-04-15 14:29:48 UTC
Red Hat Product Errata RHSA-2026:8880 0 None None None 2026-04-20 03:38:24 UTC
Red Hat Product Errata RHSA-2026:9220 0 None None None 2026-04-21 06:04:07 UTC

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.
Comment 2 errata-xmlrpc 2026-03-31 20:03:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:6301 https://access.redhat.com/errata/RHSA-2026:6301
Comment 3 errata-xmlrpc 2026-04-14 15:05:09 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:8119 https://access.redhat.com/errata/RHSA-2026:8119
Comment 4 errata-xmlrpc 2026-04-15 14:29:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:8317 https://access.redhat.com/errata/RHSA-2026:8317
Comment 5 errata-xmlrpc 2026-04-20 03:38:24 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:8880 https://access.redhat.com/errata/RHSA-2026:8880
Comment 6 errata-xmlrpc 2026-04-21 06:04:06 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:9220 https://access.redhat.com/errata/RHSA-2026:9220
Comment 7 errata-xmlrpc 2026-04-23 23:04:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:10257 https://access.redhat.com/errata/RHSA-2026:10257
Comment 8 errata-xmlrpc 2026-04-23 23:08:09 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:10256 https://access.redhat.com/errata/RHSA-2026:10256
Comment 9 errata-xmlrpc 2026-04-24 01:02:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:10255 https://access.redhat.com/errata/RHSA-2026:10255
Comment 12 errata-xmlrpc 2026-04-29 20:22:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:11901 https://access.redhat.com/errata/RHSA-2026:11901
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