Use After Free in Squid - CVE-2026-32748

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU124612

Use After Free in Squid - CVE-2026-32748

Published: March 25, 2026


Vulnerability identifier: #VU124612
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-32748
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to use-after-free in ICP request handling when processing ICP traffic. A remote attacker can send a specially crafted ICP request to cause a denial of service.

The vulnerability is only exploitable on Squid deployments that have ICP support enabled via a non-zero icp_port configuration.


Affected software

Squid
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64
Anolis OS
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Server Applications Module
openSUSE Leap
Ubuntu
openEuler
Fedora
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
libecap-devel
libecap
squid
squid (Red Hat package)
squid-debugsource
squid-debuginfo
squid (Ubuntu package)

How to mitigate CVE-2026-32748

Install security update from vendor's website.

Squid - update to 7.5
libecap-devel - update to 1.0.1-2.0.1
libecap - update to 1.0.1-2.0.1
squid - update to 4.15-13
squid (Red Hat package) - addressed in versions 5.2-1.el9_0.10, 5.5-5.el9_2.11, 5.5-19.el9_6.3, 5.5-22.el9_7.4, 6.10-5.el10_0.2
squid - update to 6.6-8
squid-debugsource - update to 6.6-8
squid-debuginfo - update to 6.6-8
squid-debuginfo - update to 6.14-150600.3.20.1
squid-debugsource - update to 6.14-150600.3.20.1
squid - update to 6.14-150600.3.20.1
squid - addressed in versions 7.5-1.fc43, 7.5-1.fc44
squid (Ubuntu package) - addressed in versions 5.9-0ubuntu0.22.04.5, 6.14-0ubuntu0.24.04.2, 6.14-0ubuntu0.25.10.2

External References

Related Security Bulletins