SB2026052603 - Red Hat Enterprise Linux 8 update for the squid:4 module

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Main Vulnerability Database SB2026052603

SB2026052603 - Red Hat Enterprise Linux 8 update for the squid:4 module

Published: May 26, 2026

Security Bulletin ID SB2026052603
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Use After Free (CVE-ID: CVE-2026-33526)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 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/E:U/U:Green


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

The vulnerability exists due to heap 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 attack is limited to Squid deployments that have ICP support enabled via a non-zero icp_port configuration.


2) Use After Free (CVE-ID: CVE-2026-32748)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 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/E:U/U:Green


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.


Remediation

Install update from vendor's website.

References