CVE-2026-33515 | THREATINT

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.

PUBLISHED Reserved 2026-03-20 | Published 2026-03-26 | Updated 2026-03-26 | Assigner GitHub_M

MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N

Problem types

CWE-125: Out-of-bounds Read

CWE-1289: Improper Validation of Unsafe Equivalence in Input

Product status

< 7.5

affected

References

www.openwall.com/lists/oss-security/2026/03/25/4

github.com/.../squid/security/advisories/GHSA-84p4-hcx7-jj7c

github.com/squid-cache/squid/pull/2220

github.com/...ommit/8138e909d2058d4401e0ad49b583afaec912b165

cve.org (CVE-2026-33515)

nvd.nist.gov (CVE-2026-33515)

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