EUVD-2026-16056
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4Description
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.
Analysis
Squid proxy versions prior to 7.5 contain use-after-free and premature resource release vulnerabilities in ICP (Internet Cache Protocol) traffic handling that enable reliable, repeatable denial of service attacks. Remote attackers can exploit these memory safety bugs to crash the Squid service by sending specially crafted ICP packets, affecting deployments that have explicitly enabled ICP support via non-zero icp_port configuration. …
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Remediation
Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.
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Priority Score
Vendor Status
Ubuntu
Priority: Medium| Release | Status | Version |
|---|---|---|
| focal | needs-triage | - |
| jammy | needs-triage | - |
| noble | needs-triage | - |
| questing | needs-triage | - |
| upstream | needs-triage | - |
| Release | Status | Version |
|---|---|---|
| xenial | needs-triage | - |
| bionic | needs-triage | - |
| jammy | DNE | - |
| noble | DNE | - |
| questing | DNE | - |
| upstream | needs-triage | - |
Debian
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| bullseye | vulnerable | 4.13-10+deb11u3 | - |
| bullseye (security) | vulnerable | 4.13-10+deb11u6 | - |
| bookworm | vulnerable | 5.7-2+deb12u5 | - |
| bookworm (security) | vulnerable | 5.7-2+deb12u4 | - |
| trixie, trixie (security) | vulnerable | 6.13-2+deb13u1 | - |
| forky | vulnerable | 7.4-1 | - |
| sid | fixed | 7.5-1 | - |
| (unstable) | fixed | 7.5-1 | - |
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External POC / Exploit Code
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