# CVE-2024-45614: puma: Puma is a Ruby/Rack web server built for parallelism

CVE-2024-45614 is fixed in 2 products on 1 platform, first by puma 3.12.4-1ubuntu2+esm2, released September 19, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-45614
- Priority: Routine
- CVSS: 5.4 (Medium)
- EPSS: 0.0064
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 19, 2024

## Description

Puma is a Ruby/Rack web server built for parallelism. In affected versionsclients could clobber values set by intermediate proxies (such asX-Forwarded-For) by providing a underscore version of the same header(X-Forwarded_For). Any users relying on proxy set variables is affected.v6.4.3/v5.6.9 now discards any headers using underscores if thenon-underscore version also exists. Effectively, allowing the proxy definedheaders to always win. Users are advised to upgrade. Nginx has aunderscores_in_headers configuration variable to discard these headers atthe proxy level as a mitigation. Any users that are implicitly trusting theproxy defined headers for security should immediately cease doing so untilupgraded to the fixed versions.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | puma Debian 12.15 (bookworm) | 5.6.5-3+deb12u1 | [DEBIAN-CVE-2024-45614](https://patchblox.com/security/data/fix/linux/debian-cve-2024-45614.md) | Sep 19, 2024 |
| Linux | puma Debian 13.5 (trixie) | 6.4.3-1 | [DEBIAN-CVE-2024-45614](https://patchblox.com/security/data/fix/linux/debian-cve-2024-45614.md) | Sep 19, 2024 |
| Linux | puma Debian 14 | 6.4.3-1 | [DEBIAN-CVE-2024-45614](https://patchblox.com/security/data/fix/linux/debian-cve-2024-45614.md) | Sep 19, 2024 |
| Linux | puma Ubuntu 20.04 LTS (focal) | 3.12.4-1ubuntu2+esm2 | [puma 3.12.4-1ubuntu2+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-puma-3.12.4-1ubuntu2-esm2.md) | Sep 19, 2024 |
| Linux | puma Ubuntu 22.04.1 LTS (jammy) | 5.5.2-2ubuntu2+esm2 | [puma 5.5.2-2ubuntu2+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-puma-5.5.2-2ubuntu2-esm2.md) | Sep 19, 2024 |
| Linux | puma Ubuntu 24.04.5 LTS (noble) | 6.4.2-4ubuntu4.3 | [puma 6.4.2-4ubuntu4.3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-puma-6.4.2-4ubuntu4.3.md) | Sep 19, 2024 |
| Linux | puma Ubuntu 24.10 (oracular) | 6.4.2-5ubuntu4 | [puma 6.4.2-5ubuntu4](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-puma-6.4.2-5ubuntu4.md) | Sep 20, 2024 |
| Linux | puma Ubuntu 25.04 (plucky) | 6.4.2-5ubuntu4 | [puma 6.4.2-5ubuntu4](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-puma-6.4.2-5ubuntu4.md) | Sep 20, 2024 |
| Linux | rubygem-puma opensuse-leap 15.6 | 5.6.9-150600.18.3.1 | [SUSE-SU-2025:03467-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03467-1.md) | Oct 7, 2025 |
| Linux | rubygem-puma sles 15.6 | 5.6.9-150600.18.3.1 | [SUSE-SU-2025:03467-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03467-1.md) | Oct 7, 2025 |
| Linux | rubygem-puma sles 15.7 | 5.6.9-150600.18.3.1 | [SUSE-SU-2025:03467-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03467-1.md) | Oct 7, 2025 |

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Data as of 2026-11-09T19:38:12Z 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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