Is HAProxy 3.3.17 patched?
Current stable (3.4.7): 100/100
3.3.17 has 2 open critical-or-high vulnerabilities. Run 3.4.1 or later to clear them. See what 3.4.1 fixes →
Upgrade impact: Minor upgrade. Minor releases are usually backwards-compatible, but can add or change behaviour — test in staging before production.
Summary iPlain-English security status for HAProxy 3.3.17, built from its CVEs, active-exploitation data, end-of-life date and latest release.
HAProxy 3.3.17 is part of the 3.3 release line. 2 known vulnerabilities affect it. The minimum safe version is 3.4.1 — upgrade to it or later to clear the open critical/high issues. The 3.3 line is supported until 2027-01-01. The latest supported HAProxy release is 3.4.7.
Known issues affecting 3.3.17
Exploited first, then by exploitation probability.
CVE-2026-55204 HIGH EPSS 0% → fixed in 3.4.1 CVE-2026-55203 HIGH EPSS 0% → fixed in 3.4.1Other HAProxy versions
Check another release line of HAProxy.
Frequently asked
Is HAProxy 3.3.17 patched?
HAProxy 3.3.17 has 2 open critical-or-high vulnerabilities. The minimum safe version is 3.4.1 — upgrade to 3.4.1 or later to clear them.
What version should I upgrade HAProxy 3.3.17 to?
Upgrade HAProxy 3.3.17 to at least 3.4.1 to clear its 2 open critical-or-high vulnerabilities.
When does HAProxy 3.3 reach end-of-life?
HAProxy 3.3 is supported until 2027-01-01.
What is the latest version of HAProxy?
The latest supported HAProxy release is 3.4.7.
Is HAProxy 3.3.17 still receiving security updates?
Yes — the 3.3 line is still supported until 2027-01-01 and receiving security updates. The latest release is 3.4.7.
Informational only, from public data (NVD · CISA KEV · EPSS · endoflife.date), and can lag or miss vendor-specific fixes. Always confirm against HAProxy's official advisory before you patch or upgrade — HAProxy official site ↗