CVE-2026-33515
Prior to version 7.5, due to improper input validation, Squid is vulnerable to out of bounds read when handling ICP traffic.
Does this matter?
Lower severity and a low EPSS score (1.04%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 4.0
- 6.9 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 1.04% probability · 62th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125, CWE-1289
- Affected
- squid-cache/squid
- Source
- security-advisories@github.com
References
- https://github.com/squid-cache/squid/commit/8138e909d2058d4401e0ad49b583afaec912b165Patch
- https://github.com/squid-cache/squid/pull/2220Issue Tracking
- https://github.com/squid-cache/squid/pull/2220#discussion_r2727683637Issue Tracking
- https://github.com/squid-cache/squid/security/advisories/GHSA-84p4-hcx7-jj7cVendor Advisory
- http://www.openwall.com/lists/oss-security/2026/03/25/4Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.