Unrated severityNVD Advisory· Published Mar 26, 2026· Updated Mar 26, 2026
Squid vulnerable to Denial of Service in ICP Request handling
CVE-2026-33526
Description
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.
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Affected products
5<7.5+ 1 more
- (no CPE)range: <7.5
- (no CPE)range: < 7.5
- osv-coords3 versions
< 1.0.1-2.module_el8.6.0+2741+01592ae8+ 2 more
- (no CPE)range: < 1.0.1-2.module_el8.6.0+2741+01592ae8
- (no CPE)range: < 1.0.1-2.module_el8.6.0+2741+01592ae8
- (no CPE)range: < 7:5.5-22.el9_7.4
Patches
Vulnerability mechanics
References
2- github.com/squid-cache/squid/commit/8a7d42f9d44befb8fcbbb619505587c8de6a1e91mitrex_refsource_MISC
- github.com/squid-cache/squid/security/advisories/GHSA-hpfx-h48q-gvwgmitrex_refsource_CONFIRM
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