CVE-2026-33515

MEDIUM EPSS 59.7%
Published Mar 26, 20263mo ago · Modified Jun 17, 20262w ago
6.9 CVSS 4.0
Medium
Find Similar
Published Mar 26, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
6.9
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
59.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-125 Out-of-bounds Read Memory Safety
CWE-1289

Affected Products 1

VendorProductVersionRange
squid-cachesquid* <7.5

References 5

  • openwall.com http://www.openwall.com/lists/oss-security/2026/03/25/4
    Mailing ListThird Party Advisory
  • github.com https://github.com/squid-cache/squid/commit/8138e909d2058d4401e0ad49b583afaec912b165
    Patch
  • github.com https://github.com/squid-cache/squid/pull/2220
    Issue Tracking
  • github.com https://github.com/squid-cache/squid/pull/2220#discussion_r2727683637
    Issue Tracking
  • github.com https://github.com/squid-cache/squid/security/advisories/GHSA-84p4-hcx7-jj7c
    Vendor Advisory

Remediation

  • github.com https://github.com/squid-cache/squid/commit/8138e909d2058d4401e0ad49b583afaec912b165
    Patch