ALAS2023-2026-1569

References: CVE-2026-32748  CVE-2026-33526 
FAQs regarding Amazon Linux ALAS/CVE Severity

Issue Overview:

Squid is a caching proxy for the Web. Prior to version 7.5, due to premature release of resource during expected lifetime and heap Use-After-Free bugs, 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. This bug is fixed in Squid version 7.5.

NOTE: https://www.openwall.com/lists/oss-security/2026/03/25/3
NOTE: Fixed by: https://github.com/squid-cache/squid/commit/703e07d25ca6fa11f52d20bf0bb879e22ab7481b (SQUID_7_5) (CVE-2026-32748)

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.

NOTE: https://www.openwall.com/lists/oss-security/2026/03/25/2
NOTE: Fixed by: https://github.com/squid-cache/squid/commit/8a7d42f9d44befb8fcbbb619505587c8de6a1e91 (SQUID_7_5) (CVE-2026-33526)

Issue Correction:
Run dnf update squid --releasever 2023.11.20260413 or dnf update --advisory ALAS2023-2026-1569 --releasever 2023.11.20260413 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation

New Packages:

aarch64:
    squid-debuginfo-6.13-1.amzn2023.0.4.aarch64
    squid-debugsource-6.13-1.amzn2023.0.4.aarch64
    squid-6.13-1.amzn2023.0.4.aarch64

src:
    squid-6.13-1.amzn2023.0.4.src

x86_64:
    squid-debuginfo-6.13-1.amzn2023.0.4.x86_64
    squid-debugsource-6.13-1.amzn2023.0.4.x86_64
    squid-6.13-1.amzn2023.0.4.x86_64