CVE-2026-33526

Name
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.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
security-advisories@github.com https://github.com/squid-cache/squid/commit/8a7d42f9d44befb8fcbbb619505587c8de6a1e91
security-advisories@github.com https://github.com/squid-cache/squid/security/advisories/GHSA-hpfx-h48q-gvwg
af854a3a-2127-422b-91ae-364da2661108 http://www.openwall.com/lists/oss-security/2026/03/25/2

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* squid >= None < 7.5

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
squid edge-main 7.4-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid edge-main 7.3-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid edge-main 6.12-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid edge-main 6.12-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid edge-main 6.6-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid edge-main 6.5-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid edge-main 6.4-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid edge-main 6.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid edge-main 5.7-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid edge-main 5.2-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid edge-main 5.0.6-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid edge-main 5.0.5-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid edge-main 4.13.0-r0 None possibly vulnerable
squid edge-main 4.12.0-r0 None possibly vulnerable
squid edge-main 4.10-r0 None possibly vulnerable
squid edge-main 4.9-r0 None possibly vulnerable
squid edge-main 4.8-r0 None possibly vulnerable
squid edge-main 3.5.27-r2 None possibly vulnerable
squid 3.23-main 7.3-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid 3.22-main 6.12-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid 3.22-main 6.6-r0 None possibly vulnerable
squid 3.22-main 6.5-r0 None possibly vulnerable
squid 3.22-main 6.4-r0 None possibly vulnerable
squid 3.22-main 6.1-r0 None possibly vulnerable
squid 3.22-main 5.7-r0 None possibly vulnerable
squid 3.22-main 5.2-r0 None possibly vulnerable
squid 3.22-main 5.0.6-r0 None possibly vulnerable
squid 3.22-main 5.0.5-r0 None possibly vulnerable
squid 3.22-main 4.13.0-r0 None possibly vulnerable
squid 3.22-main 4.12.0-r0 None possibly vulnerable
squid 3.22-main 4.10-r0 None possibly vulnerable
squid 3.22-main 4.9-r0 None possibly vulnerable
squid 3.22-main 4.8-r0 None possibly vulnerable
squid 3.22-main 3.5.27-r2 None possibly vulnerable
squid 3.21-main 6.12-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid 3.21-main 6.6-r0 None possibly vulnerable
squid 3.21-main 6.5-r0 None possibly vulnerable
squid 3.21-main 6.4-r0 None possibly vulnerable
squid 3.21-main 6.1-r0 None possibly vulnerable
squid 3.21-main 5.7-r0 None possibly vulnerable
squid 3.21-main 5.2-r0 None possibly vulnerable
squid 3.21-main 5.0.6-r0 None possibly vulnerable
squid 3.21-main 5.0.5-r0 None possibly vulnerable
squid 3.21-main 4.13.0-r0 None possibly vulnerable
squid 3.21-main 4.12.0-r0 None possibly vulnerable
squid 3.21-main 4.10-r0 None possibly vulnerable
squid 3.21-main 4.9-r0 None possibly vulnerable
squid 3.21-main 4.8-r0 None possibly vulnerable
squid 3.21-main 3.5.27-r2 None possibly vulnerable
squid 3.20-main 6.9-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid 3.20-main 6.6-r0 None possibly vulnerable
squid 3.20-main 6.5-r0 None possibly vulnerable
squid 3.20-main 6.4-r0 None possibly vulnerable
squid 3.20-main 6.1-r0 None possibly vulnerable
squid 3.20-main 5.7-r0 None possibly vulnerable
squid 3.20-main 5.2-r0 None possibly vulnerable
squid 3.20-main 5.0.6-r0 None possibly vulnerable
squid 3.20-main 5.0.5-r0 None possibly vulnerable
squid 3.20-main 4.13.0-r0 None possibly vulnerable
squid 3.20-main 4.12.0-r0 None possibly vulnerable
squid 3.20-main 4.10-r0 None possibly vulnerable
squid 3.20-main 4.9-r0 None possibly vulnerable
squid 3.20-main 4.8-r0 None possibly vulnerable
squid 3.20-main 3.5.27-r2 None possibly vulnerable
squid 3.19-main 6.6-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid 3.19-main 6.5-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
squid 3.19-main 6.4-r0 None possibly vulnerable
squid 3.19-main 6.1-r0 None possibly vulnerable
squid 3.19-main 5.7-r0 None possibly vulnerable
squid 3.19-main 5.2-r0 None possibly vulnerable
squid 3.19-main 5.0.6-r0 None possibly vulnerable
squid 3.19-main 5.0.5-r0 None possibly vulnerable
squid 3.19-main 4.13.0-r0 None possibly vulnerable
squid 3.19-main 4.12.0-r0 None possibly vulnerable
squid 3.19-main 4.10-r0 None possibly vulnerable
squid 3.19-main 4.9-r0 None possibly vulnerable
squid 3.19-main 4.8-r0 None possibly vulnerable
squid 3.19-main 3.5.27-r2 None possibly vulnerable