CVE-2022-23634: Debian Linux

Medium severity, CVSS 5.9. EPSS: 2.1% chance of exploitation in the next 30 days.

Puma is a Ruby/Rack web server built for parallelism. Prior to `puma` version `5.6.2`, `puma` may not always call `close` on the response body. Rails, prior to version `7.0.2.2`, depended on the response body being closed in order for its `CurrentAttributes` implementation to work correctly. The combination of these two behaviors (Puma not closing the body + Rails' Executor implementation) causes information leakage. This problem is fixed in Puma versions 5.6.2 and 4.3.11. This problem is fixed in Rails versions 7.02.2, 6.1.4.6, 6.0.4.6, and 5.2.6.2. Upgrading to a patched Rails _or_ Puma version fixes the vulnerability.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only; version 11.0 only
• Fedoraproject Fedora: version 35 only; version 36 only; version 37 only
• Puma Puma: before 4.3.11 (fixed in 4.3.11); from 5.0.0, before 5.6.2 (fixed in 5.6.2)
• Rubyonrails Rails: from 5.0.0, before 5.2.6.2 (fixed in 5.2.6.2); from 6.0.0, before 6.0.4.6 (fixed in 6.0.4.6); from 6.1.0, before 6.1.4.6 (fixed in 6.1.4.6); from 7.0.0, before 7.0.2.2 (fixed in 7.0.2.2)

Published 2022-02-11. Last modified 2026-06-17.