Squid has issues in ICP message handling
CVE-2026-33515 is fixed in 7 products on 1 platform, first by DEBIAN-CVE-2026-33515, released March 26, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| squid · Debian 12.15 (bookworm) | 5.7-2+deb12u6 | DEBIAN-CVE-2026-33515 | Mar 26, 2026 |
| squid · Debian 13.5 (trixie) | 6.13-2+deb13u2 | DEBIAN-CVE-2026-33515 | Mar 26, 2026 |
| squid · Debian 14 | 7.5-1 | DEBIAN-CVE-2026-33515 | Mar 26, 2026 |
| squid · Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.14+esm6 | squid 3.5.27-1ubuntu1.14+esm6 | Oct 24, 2026 |
| squid · Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.13+esm3 | squid 4.10-1ubuntu1.13+esm3 | Oct 24, 2026 |
| squid · Ubuntu 22.04.1 LTS (jammy) | 5.9-0ubuntu0.22.04.5 | squid 5.9-0ubuntu0.22.04.5 | Apr 15, 2026 |
| squid · Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.2 | squid 6.14-0ubuntu0.24.04.2 | Apr 15, 2026 |
| squid · Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.2 | squid 6.14-0ubuntu0.25.10.2 | Apr 15, 2026 |
| squid · opensuse-leap 16.0 | 6.14-160000.1.1 | OPENSUSE-SU-2026:22080-1 | Nov 7, 2026 |
| squid · sles 15.6 | 6.14-150600.3.20.1 | SUSE-SU-2026:4621-1 | Nov 7, 2026 |
| squid · sles 15.7 | 6.14-150600.3.20.1 | SUSE-SU-2026:4621-1 | Nov 7, 2026 |
| squid · sles 16.0 | 6.14-160000.1.1 | SUSE-SU-2026:24224-1 | Nov 7, 2026 |
| squid-cgi · Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.14+esm6 | squid-cgi 3.5.27-1ubuntu1.14+esm6 | Oct 24, 2026 |
| squid-cgi · Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.13+esm3 | squid-cgi 4.10-1ubuntu1.13+esm3 | Oct 24, 2026 |
| squid-cgi · Ubuntu 22.04.1 LTS (jammy) | 5.9-0ubuntu0.22.04.5 | squid-cgi 5.9-0ubuntu0.22.04.5 | Apr 15, 2026 |
| squid-cgi · Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.2 | squid-cgi 6.14-0ubuntu0.24.04.2 | Apr 15, 2026 |
| squid-cgi · Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.2 | squid-cgi 6.14-0ubuntu0.25.10.2 | Apr 15, 2026 |
| squid-common · Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.14+esm6 | squid-common 3.5.27-1ubuntu1.14+esm6 | Oct 24, 2026 |
| squid-common · Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.13+esm3 | squid-common 4.10-1ubuntu1.13+esm3 | Oct 24, 2026 |
| squid-common · Ubuntu 22.04.1 LTS (jammy) | 5.9-0ubuntu0.22.04.5 | squid-common 5.9-0ubuntu0.22.04.5 | Apr 15, 2026 |
| squid-common · Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.2 | squid-common 6.14-0ubuntu0.24.04.2 | Apr 15, 2026 |
| squid-common · Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.2 | squid-common 6.14-0ubuntu0.25.10.2 | Apr 15, 2026 |
| squid-openssl · Ubuntu 22.04.1 LTS (jammy) | 5.9-0ubuntu0.22.04.5 | squid-openssl 5.9-0ubuntu0.22.04.5 | Apr 15, 2026 |
| squid-openssl · Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.2 | squid-openssl 6.14-0ubuntu0.24.04.2 | Apr 15, 2026 |
| squid-openssl · Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.2 | squid-openssl 6.14-0ubuntu0.25.10.2 | Apr 15, 2026 |
| squid-purge · Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.14+esm6 | squid-purge 3.5.27-1ubuntu1.14+esm6 | Oct 24, 2026 |
| squid-purge · Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.13+esm3 | squid-purge 4.10-1ubuntu1.13+esm3 | Oct 24, 2026 |
| squid-purge · Ubuntu 22.04.1 LTS (jammy) | 5.9-0ubuntu0.22.04.5 | squid-purge 5.9-0ubuntu0.22.04.5 | Apr 15, 2026 |
| squid-purge · Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.2 | squid-purge 6.14-0ubuntu0.24.04.2 | Apr 15, 2026 |
| squid-purge · Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.2 | squid-purge 6.14-0ubuntu0.25.10.2 | Apr 15, 2026 |
| squid3 · Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.14+esm6 | squid3 3.5.27-1ubuntu1.14+esm6 | Oct 24, 2026 |
| squidclient · Ubuntu 18.04.6 LTS (bionic) | 3.5.27-1ubuntu1.14+esm6 | squidclient 3.5.27-1ubuntu1.14+esm6 | Oct 24, 2026 |
| squidclient · Ubuntu 20.04 LTS (focal) | 4.10-1ubuntu1.13+esm3 | squidclient 4.10-1ubuntu1.13+esm3 | Oct 24, 2026 |
| squidclient · Ubuntu 22.04.1 LTS (jammy) | 5.9-0ubuntu0.22.04.5 | squidclient 5.9-0ubuntu0.22.04.5 | Apr 15, 2026 |
| squidclient · Ubuntu 24.04.5 LTS (noble) | 6.14-0ubuntu0.24.04.2 | squidclient 6.14-0ubuntu0.24.04.2 | Apr 15, 2026 |
| squidclient · Ubuntu 25.10 (questing) | 6.14-0ubuntu0.25.10.2 | squidclient 6.14-0ubuntu0.25.10.2 | Apr 15, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.