CVE-2026-33515CWE-125CWE-1289

Squid has issues in ICP message handling

Medium · published March 26, 2026

CVSS v4.0
6.9
EPSS
1%
Percentile
63.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
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
EPSS
0.01039 · 63.7th percentile
Weaknesses
CWE-125 · Out-of-bounds Read; CWE-1289 · Improper Validation of Unsafe Equivalence in Input
Published
2026-03-26T00:13Z
EPSS history
Timeline
  • 26 MAR 00:13Z
    Squid has issues in ICP message handling
    cvelistv5