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ALSA-2026:6301 — Important: squid security update

Affected: AlmaLinux:9: squid

Squid is a high-performance proxy caching server for web clients, supporting FTP, and HTTP data objects.

Security Fix(es):

* squid: Squid: Denial of Service via heap Use-After-Free vulnerability in ICP handling (CVE-2026-33526) * Squid: Squid: Denial of Service via crafted ICP traffic (CVE-2026-32748)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

bdu:2026-07191

certfr-2026-avi-0350 — De multiples vulnérabilités ont été découvertes dans Squid. Elles permettent à un attaquant de provoquer un déni de ser…

certfr-2026-avi-0350

EUVD-2026-337347

fkie_cve-2026-32748

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.

msrc_CVE-2026-32748 — Squid has Denial of Service in ICP Response handling

msrc_CVE-2026-32748

OESA-2026-1795 — squid security update

Affected: openEuler:24.03-LTS-SP1: squid

Squid is a high-performance proxy caching server. It handles all requests in a single, non-blocking, I/O-driven process and keeps meta data and implements negative caching of failed requests. Security Fix(es):

Squid is a widely used proxy caching server. Due to premature release of resources and heap Use-After-Free bugs during the handling of ICP (Internet Cache Protocol) traffic, Squid is vulnerable to Denial of Service. A remote attacker can cause the Squid service to crash by sending specially crafted ICP requests to a Squid instance with ICP support enabled, resulting in a reliable and repeatable Denial of Service attack. This vulnerability only affects Squid deployments that explicitly enable ICP support (i.e., configure a non-zero `icp_port`). It is important to note that this problem cannot be mitigated by denying ICP queries using `icp_access` rules.(CVE-2026-32748)

Squid is a caching proxy for the Web. Prior to version 7.5, due to improper input validation, Squid is vulnerable to out of bounds read when handling ICP traffic. This problem allows a remote attacker to receive small amounts of memory potentially containing sensitive information when responding with errors to invalid ICP requests. 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.(CVE-2026-33515)

Squid is a caching proxy fo…

RHSA-2026:10255 — Red Hat Security Advisory: squid security update

Squid: Squid: Denial of Service via crafted ICP traffic squid: Squid: Denial of Service via heap Use-After-Free vulnerability in ICP handling

RHSA-2026:6301 — Red Hat Security Advisory: squid security update

Squid: Squid: Denial of Service via crafted ICP traffic squid: Squid: Denial of Service via heap Use-After-Free vulnerability in ICP handling

UBUNTU-CVE-2026-32748

Affected: Ubuntu:Pro:16.04:LTS: squid3, Ubuntu:Pro:18.04:LTS: squid3, Ubuntu:Pro:20.04:LTS: squid, Ubuntu:22.04:LTS: squid, Ubuntu:24.04:LTS: squid, Ubuntu:25.10: squid

WID-SEC-W-2026-0854 — Squid: Mehrere Schwachstellen ermöglichen Denial of Service

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Squid ausnutzen, um einen Denial of Service Angriff durchzuführen.