# CVE-2022-23634: puma: Puma is a Ruby/Rack web server built for parallelism

CVE-2022-23634 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2022-23634, released February 11, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-23634
- Priority: Routine
- CVSS: 5.9 (medium)
- EPSS: 0.0211
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 11, 2022

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libdb rocky 8 | 0:5.3.28-42.el8_4 | [RLSA-2022:5498](https://patchblox.com/security/data/fix/linux/rlsa-2022-5498.md) | Jul 5, 2022 |
| Linux | puma Debian 12.15 (bookworm) | 5.6.4-1 | [DEBIAN-CVE-2022-23634](https://patchblox.com/security/data/fix/linux/debian-cve-2022-23634.md) | Feb 11, 2022 |
| Linux | puma Debian 13.5 (trixie) | 5.6.4-1 | [DEBIAN-CVE-2022-23634](https://patchblox.com/security/data/fix/linux/debian-cve-2022-23634.md) | Feb 11, 2022 |
| Linux | puma Debian 14 | 5.6.4-1 | [DEBIAN-CVE-2022-23634](https://patchblox.com/security/data/fix/linux/debian-cve-2022-23634.md) | Feb 11, 2022 |
| Linux | puma Ubuntu 20.04 LTS (focal) | 3.12.4-1ubuntu2+esm1 | [puma 3.12.4-1ubuntu2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-puma-3.12.4-1ubuntu2-esm1.md) | Jan 8, 2024 |
| Linux | puma Ubuntu 22.04.1 LTS (jammy) | 5.5.2-2ubuntu2+esm1 | [puma 5.5.2-2ubuntu2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-puma-5.5.2-2ubuntu2-esm1.md) | Jan 8, 2024 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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