CVE-2026-33526
Squid vulnerable to Denial of Service in ICP Request handling
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-416 CWE-826 |
| Vendor | squid-cache |
| Product | squid |
| Published | Mar 26, 2026 |
| Last Updated | Jul 15, 2026 |
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Affected Versions
squid-cache / squid
< 7.5
References
github.com: https://github.com/squid-cache/squid/security/advisories/GHSA-hpfx-h48q-gvwg github.com: https://github.com/squid-cache/squid/commit/8a7d42f9d44befb8fcbbb619505587c8de6a1e91 openwall.com: http://www.openwall.com/lists/oss-security/2026/03/25/2 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-33526 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2451574 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33526.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:8880 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:11901 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:8119 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:8317 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:20564 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:20565 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:20580 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:10256 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:10257 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:10255 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:9220 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:6301