Which OpenSSL version should a payment platform run in 2026?

A supported one. According to the OpenSSL project, OpenSSL 3.5 is the long-term support release, maintained until April 8, 2030, while 3.0 reached end of life in September 2026. Operating system vendors may also backport fixes to their own packages, so the vendor's support policy matters as much as the version number.

Supported versions

According to the OpenSSL project, OpenSSL 3.5 is the current long-term support release, maintained until April 8, 2030. The 3.0 series, also a long-term release, reached end of life in September 2026. Versions between them have shorter support windows. A payment platform should run a version that still receives security fixes, which in practice means 3.5 or a later supported release.

What the version number does not tell you

• Operating system vendors often ship their own OpenSSL packages and backport security fixes without changing the upstream version number.
• A distribution's package may be supported longer than upstream, or shorter.
• Applications may bundle their own copy of OpenSSL, separate from the system's.

What to check

The vendor's support policy for each package in use, the list of bundled copies in applications and containers, and the date of the last security update applied. An inventory that records all three, per system, is what makes the next vulnerability announcement a short exercise. Operators building on a managed platform should ask the provider the same questions and keep the answer on file.