Squid Denial of Service via crafted ICP traffic
CVE-2026-32748 is a denial-of-service vulnerability in Squid's handling of ICP (Internet Cache Protocol) traffic. In Squid versions prior to 7.5, premature release of a resource during its expected lifetime leads to heap use-after-free conditions while processing ICP requests. A remote attacker can send crafted ICP traffic to trigger the flaw and reliably, repeatedly crash or otherwise disrupt the Squid service. The issue is limited to deployments that explicitly enable ICP support via a non-zero icp_port. Advisory material notes that affected release lines include Squid 3.x through 7.4.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
icp_port 0 as a workaround. icp_access rules are not an effective mitigation for this issue; denying ICP queries with icp_access does not prevent exploitation. Administrators can verify whether ICP is enabled by checking for a non-zero ICP-related port in the active configuration.Remediation
Patch, then assume compromise.
703e07d25ca6fa11f52d20bf0bb879e22ab7481b for the Squid 7 branch.Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.