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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| squid-cache | squid | < 7.5 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | squid | 7.5-1 | — |
| Debian 13 | squid | 6.13-2+deb13u2 | — |
| Debian 12 | squid | 5.7-2+deb12u6 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | squid | 6.14-0ubuntu0.25.10.2 | — |
| Ubuntu 24.04 LTS | squid | 6.14-0ubuntu0.24.04.2 | USN-8941-1 |
| Ubuntu 22.04 LTS | squid | 5.9-0ubuntu0.22.04.5 | USN-8941-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | squid | 4.10-1ubuntu1.13+esm3 | USN-8941-1 |
| Ubuntu Pro 18.04 LTS | squid3 | 3.5.27-1ubuntu1.14+esm6 | USN-8941-1 |
| Ubuntu Pro 16.04 LTS | squid3 | 3.5.12-1ubuntu7.16+esm7 | USN-8941-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | squid | 6.14-150600.3.20.1 | SUSE-SU-2026:4621-1 |
| SLES 15 SP6 | squid | 6.14-150600.3.20.1 | SUSE-SU-2026:4621-1 |
| SLES 15 SP5 | squid | 5.7-150400.3.41.1 | SUSE-SU-2026:4909-1 |
| SLES 15 SP4 | squid | 5.7-150400.3.41.1 | SUSE-SU-2026:4909-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | squid | 6.14-160000.1.1 | SUSE-SU-2026:24224-1 |
| SLES for SAP 15 SP6 | squid | 6.14-150600.3.20.1 | SUSE-SU-2026:4621-1 |
| SLES for SAP 15 SP5 | squid | 5.7-150400.3.41.1 | SUSE-SU-2026:4909-1 |
| SLES for SAP 15 SP4 | squid | 5.7-150400.3.41.1 | SUSE-SU-2026:4909-1 |
| SLES 16.0 | squid | 6.14-160000.1.1 | SUSE-SU-2026:24224-1 |
| SLE HPC 15 SP5 | squid | 5.7-150400.3.41.1 | SUSE-SU-2026:4909-1 |
| SLE HPC 15 SP4 | squid | 5.7-150400.3.41.1 | SUSE-SU-2026:4909-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | squid | 7.7-2.1 | openSUSE-SU-2026:11937-1 |
| openSUSE Leap 16.0 | squid | 6.14-160000.1.1 | openSUSE-SU-2026:22080-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | squid | 6.13-4 | — |
Advisories 7
- WID-SEC-2026-0854 Squid: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Nov 10, 2026
- SUSE-SU-2026:4909-1 Security update for squid SUSE / openSUSE Security Updates · Oct 26, 2026
- USN-8941-1 squid, squid3 vulnerabilities Ubuntu Security Notices (USN) · Oct 21, 2026
- SUSE-SU-2026:24224-1 Security update for squid SUSE / openSUSE Security Updates · Oct 21, 2026
- openSUSE-SU-2026:22080-1 Security update for squid SUSE / openSUSE Security Updates · Oct 19, 2026
- SUSE-SU-2026:4621-1 Security update for squid SUSE / openSUSE Security Updates · Oct 13, 2026
- openSUSE-SU-2026:11937-1 squid-7.7-2.1 on GA media SUSE / openSUSE Security Updates · Oct 1, 2026