# CVE-2022-24790: puma: Puma is a simple, fast, multi-threaded, parallel HTTP 1.1 server for Ruby/Rack applications

CVE-2022-24790 is fixed in puma on 1 platform, first by DEBIAN-CVE-2022-24790, released March 30, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-24790
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0219
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 30, 2022

## Description

Puma is a simple, fast, multi-threaded, parallel HTTP 1.1 server for Ruby/Rack applications. When using Puma behind a proxy that does not properly validate that the incoming HTTP request matches the RFC7230 standard, Puma and the frontend proxy may disagree on where a request starts and ends. This would allow requests to be smuggled via the front-end proxy to Puma. The vulnerability has been fixed in 5.6.4 and 4.3.12. Users are advised to upgrade as soon as possible. Workaround: when deploying a proxy in front of Puma, turning on any and all functionality to make sure that the request matches the RFC7230 standard.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | puma Debian 12.15 (bookworm) | 5.6.4-1 | [DEBIAN-CVE-2022-24790](https://patchblox.com/security/data/fix/linux/debian-cve-2022-24790.md) | Mar 30, 2022 |
| Linux | puma Debian 13.5 (trixie) | 5.6.4-1 | [DEBIAN-CVE-2022-24790](https://patchblox.com/security/data/fix/linux/debian-cve-2022-24790.md) | Mar 30, 2022 |
| Linux | puma Debian 14 | 5.6.4-1 | [DEBIAN-CVE-2022-24790](https://patchblox.com/security/data/fix/linux/debian-cve-2022-24790.md) | Mar 30, 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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