Squid is a caching proxy for the Web. Prior to version 7.5, due to improper input validation, Squid is vulnerable to out of bounds read when handling ICP traffic. This problem allows a remote attacker to receive small amounts of memory potentially containing sensitive information when responding with errors to invalid ICP requests. 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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Squid-cache
  • Squid

No data.

No data.

References
Link Providers
http://www.openwall.com/lists/oss-security/2026/03/25/4 cve-icon cve-icon
https://github.com/squid-cache/squid/commit/8138e909d2058d4401e0ad49b583afaec912b165 cve-icon cve-icon cve-icon
https://github.com/squid-cache/squid/pull/2220 cve-icon cve-icon cve-icon
https://github.com/squid-cache/squid/pull/2220#discussion_r2727683637 cve-icon cve-icon cve-icon
https://github.com/squid-cache/squid/security/advisories/GHSA-84p4-hcx7-jj7c cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-33515 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-33515 cve-icon
History

Thu, 26 Mar 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 26 Mar 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

threat_severity

Moderate

Thu, 26 Mar 2026 12:00:00 +0000

Type Values Removed Values Added
First Time appeared Squid-cache
Squid-cache squid
Vendors & Products Squid-cache
Squid-cache squid

Thu, 26 Mar 2026 01:30:00 +0000

Type Values Removed Values Added
References

Thu, 26 Mar 2026 01:00:00 +0000

Type Values Removed Values Added
Description Squid is a caching proxy for the Web. Prior to version 7.5, due to improper input validation, Squid is vulnerable to out of bounds read when handling ICP traffic. This problem allows a remote attacker to receive small amounts of memory potentially containing sensitive information when responding with errors to invalid ICP requests. 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.
Title Squid has issues in ICP message handling
Weaknesses CWE-125
CWE-1289
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-26T14:19:39.660Z

Reserved: 2026-03-20T16:59:08.891Z

Link: CVE-2026-33515

cve-icon Vulnrichment

Updated: 2026-03-26T00:24:56.505Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-26T01:16:27.690

Modified: 2026-03-26T15:13:15.790

Link: CVE-2026-33515

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-03-26T00:13:51Z

Links: CVE-2026-33515 - Bugzilla