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Squid is a caching proxy for the Web. Due to an Uncontrolled Recursion bug in versions 2.6 through 2.7.STABLE9, versions 3.1 through 5.9, and versions 6.0.1 through 6.5, Squid may be vulnerable to a Denial of Service attack against HTTP Request parsing. This problem allows a remote client to perform Denial of Service attack by sending a large X-Forwarded-For header when the follow_x_forwarded_for feature is configured. This bug is fixed by Squid version 6.6. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade libecapUpgrade libecap-develUpgrade squid | Apr 15, 2024 | Dec 14, 2023 |
| Alpine Linux | — | Upgrade squid | Mar 26, 2024 | Dec 14, 2023 |
| Amazon Linux Ami 2 | — | Upgrade squid-sysvinitUpgrade squid-migration-scriptUpgrade squidUpgrade squid-debuginfo | Feb 8, 2024 | Dec 14, 2023 |
| Amazon_linux | — | Upgrade squid | Feb 6, 2024 | Dec 14, 2023 |
| Amazon_linux_2023 | — | Upgrade squid-debugsourceUpgrade squidUpgrade squid-debuginfo | Feb 17, 2025 | Dec 14, 2023 |
| Centos_linux | — | Upgrade squid-debuginfoUpgrade squid-migration-scriptUpgrade squidUpgrade squid-sysvinit | Apr 12, 2024 | Dec 14, 2023 |
| Debian | — | Upgrade squid | Jan 15, 2024 | Dec 14, 2023 |
| Huawei Euleros 2_0_sp8 | — | Upgrade squid | Mar 13, 2024 | Dec 14, 2023 |
| Oracle_linux | — | Upgrade squid-migration-scriptUpgrade squidUpgrade libecap-develUpgrade libecapUpgrade squid-sysvinit | Mar 21, 2024 | Dec 14, 2023 |
| Redhat_linux | — | No solution existsUpgrade squid-debugsourceUpgrade libecap-debugsourceUpgrade squidUpgrade squid-migration-scriptUpgrade libecap-develUpgrade libecapUpgrade libecap-debuginfoUpgrade squid-debuginfoUpgrade squid-sysvinit | Jan 26, 2024 | Dec 14, 2023 |
| Rocky_linux | — | Upgrade libecap-develUpgrade libecap-debugsourceUpgrade libecap-debuginfoUpgrade libecap | May 8, 2025 | Dec 14, 2023 |
| Suse | — | Upgrade squid | Feb 2, 2024 | Dec 14, 2023 |
| Ubuntu | — | Upgrade squidUpgrade squid (Ubuntu Pro)Upgrade squid3 (Ubuntu Pro) | Jan 24, 2024 | Dec 14, 2023 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Dec 14, 2023 |
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