Complete end-of-life dates, support windows, and security status for all Squid versions. Data sourced from endoflife.date and official vendor documentation. Updated at every deploy.
| Version | Latest Release | Release Date | EOL Date | Days | Status |
|---|---|---|---|---|---|
| 2.4 | 2.4.7 | Mar 20, 2001 | Jul 2, 2002 | 8712 days past EOL | EOL |
| 2.5 | 2.5.14 | Sep 24, 2002 | May 20, 2006 | 7294 days past EOL | EOL |
| 2.6 | 2.6.24 | Jul 1, 2006 | Mar 26, 2010 | 5888 days past EOL | EOL |
| 3.0 | 3.0.26 | Dec 14, 2007 | Aug 27, 2011 | 5369 days past EOL | EOL |
| 2.7 | 2.7.9 | May 27, 2008 | Mar 14, 2010 | 5900 days past EOL | EOL |
| 3.1 | 3.1.23 | Mar 29, 2010 | Jan 8, 2013 | 4869 days past EOL | EOL |
| 3.2 | 3.2.14 | Aug 14, 2012 | May 1, 2015 | 4026 days past EOL | EOL |
| 3.3 | 3.3.14 | Feb 9, 2013 | May 1, 2015 | 4026 days past EOL | EOL |
| 3.4 | 3.4.14 | Dec 8, 2013 | Aug 1, 2015 | 3934 days past EOL | EOL |
| 3.5 | 3.5.28 | Jan 13, 2015 | Aug 7, 2018 | 2832 days past EOL | EOL |
| 4 | 4.17 | Jul 3, 2018 | Oct 4, 2021 | 1678 days past EOL | EOL |
| 5 | 5.9 | Jul 31, 2021 | Jul 6, 2023 | 1038 days past EOL | EOL |
| 6 | 6.14 | Jul 6, 2023 | Jul 10, 2025 | 303 days past EOL | EOL |
| 7 | 7.5 | Jul 10, 2025 | Already EOL | Supported | Active |
When a Squid version reaches end of life, the maintainers stop issuing security patches. Vulnerabilities discovered after this date are publicly disclosed on the National Vulnerability Database, exploit code appears on GitHub, and your systems remain permanently exposed.
The CVE blind spot: Most vulnerability scanners check for known CVEs but do not flag the accumulation of unpatched vulnerabilities in EOL software. With a zero-day, nobody knows about the vulnerability. With EOL software, the vulnerability is public — listed, rated, and often weaponized — but no patch will ever exist. This is the most dangerous gap in enterprise security posture.
Organizations running EOL Squid should treat it as a vulnerability class in their risk register, apply compensating controls (network segmentation, enhanced monitoring, access restriction), and prioritize migration to a supported version.
Upload requirements.txt, package.json, or Gemfile — full EOL report instantly.
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