CVSS 4.0
9.2 criticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:HCVE-2026-33526
Critical (9.2) in squid-cache squid. EPSS 9.1% chance of exploitation in the next 30 days.
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.
Severity
CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- EPSS
- 9.1% chance of exploitation in the next 30 days; higher than 95% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-416, CWE-826, CWE-825
- Published
- Modified
- Record from
- the NVD, synced
Affected
- squid-cache:squid
References
- https://github.com/squid-cache/squid/commit/8a7d42f9d44befb8fcbbb619505587c8de6a1e91
- https://github.com/squid-cache/squid/security/advisories/GHSA-hpfx-h48q-gvwg
- http://www.openwall.com/lists/oss-security/2026/03/25/2
- https://access.redhat.com/errata/RHSA-2026:10255
- https://access.redhat.com/errata/RHSA-2026:10256