CVE-2026-32748

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/squid-cache/squid/commit/703e07d25ca6fa11f52d20bf0bb879e22ab7481b	Patch
https://github.com/squid-cache/squid/security/advisories/GHSA-f9p7-3jqg-hhvq	Mitigation Patch Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/03/25/3	Mailing List Patch Third Party Advisory Mitigation

Configurations

Configuration 1 (hide)

cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-03-26 01:16

Updated : 2026-03-26 20:43

NVD link : CVE-2026-32748

Mitre link : CVE-2026-32748

CVE.ORG link : CVE-2026-32748

JSON object : View

Products Affected

squid-cache

squid

CWE

CWE-413

Improper Resource Locking

CWE-416

Use After Free

CWE-826

Premature Release of Resource During Expected Lifetime

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