CVE-2026-33515

Name	CVE-2026-33515
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
squid (PTS)	bullseye	4.13-10+deb11u3	vulnerable
	bullseye (security)	4.13-10+deb11u6	vulnerable
	bookworm	5.7-2+deb12u5	vulnerable
	bookworm (security)	5.7-2+deb12u4	vulnerable
	trixie, trixie (security)	6.13-2+deb13u1	vulnerable
	forky, sid	7.5-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
squid	source	(unstable)	7.5-1

Notes

[trixie] - squid <no-dsa> (Minor issue)
[bookworm] - squid <no-dsa> (Minor issue)
[bullseye] - squid <postponed> (Minor issue)
https://www.openwall.com/lists/oss-security/2026/03/25/4
Fxied by: https://github.com/squid-cache/squid/commit/8138e909d2058d4401e0ad49b583afaec912b165 (SQUID_7_5)