# CVE-2026-25500: ruby-rack: Rack is a modular Ruby web server interface

CVE-2026-25500 is fixed in ruby-rack on 1 platform, first by ruby-rack 3.2.4-1ubuntu1, released February 18, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-25500
- Priority: Routine
- CVSS: 5.4 (Medium)
- EPSS: 0.0027
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 18, 2026

## Description

Rack is a modular Ruby web server interface. Prior to versions 2.2.22, 3.1.20, and 3.2.5, `Rack::Directory` generates an HTML directory index where each file entry is rendered as a clickable link. If a file exists on disk whose basename starts with the `javascript:` scheme (e.g. `javascript:alert(1)`), the generated index contains an anchor whose `href` is exactly `javascript:alert(1)`. Clicking the entry executes JavaScript in the browser (demonstrated with `alert(1)`). Versions 2.2.22, 3.1.20, and 3.2.5 fix the issue.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ruby-rack Debian 12.15 (bookworm) | 2.2.22-0+deb12u1 | [DEBIAN-CVE-2026-25500](https://patchblox.com/security/data/fix/linux/debian-cve-2026-25500.md) | Feb 18, 2026 |
| Linux | ruby-rack Debian 13.5 (trixie) | 3.1.20-0+deb13u1 | [DEBIAN-CVE-2026-25500](https://patchblox.com/security/data/fix/linux/debian-cve-2026-25500.md) | Feb 18, 2026 |
| Linux | ruby-rack Debian 14 | 3.2.5-1 | [DEBIAN-CVE-2026-25500](https://patchblox.com/security/data/fix/linux/debian-cve-2026-25500.md) | Feb 18, 2026 |
| Linux | ruby-rack Ubuntu 20.04 LTS (focal) | 2.0.7-2ubuntu0.1+esm9 | [ruby-rack 2.0.7-2ubuntu0.1+esm9](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ruby-rack-2.0.7-2ubuntu0.1-esm9.md) | Mar 12, 2026 |
| Linux | ruby-rack Ubuntu 22.04.1 LTS (jammy) | 2.1.4-5ubuntu1.2+esm2 | [ruby-rack 2.1.4-5ubuntu1.2+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ruby-rack-2.1.4-5ubuntu1.2-esm2.md) | Mar 12, 2026 |
| Linux | ruby-rack Ubuntu 24.04.5 LTS (noble) | 2.2.7-1ubuntu0.6 | [ruby-rack 2.2.7-1ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-ruby-rack-2.2.7-1ubuntu0.6.md) | Mar 12, 2026 |
| Linux | ruby-rack Ubuntu 25.10 (questing) | 3.1.16-0.1ubuntu0.2 | [ruby-rack 3.1.16-0.1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-ruby-rack-3.1.16-0.1ubuntu0.2.md) | Mar 12, 2026 |
| Linux | ruby-rack Ubuntu 26.04.1 LTS (resolute) | 3.2.4-1ubuntu1 | [ruby-rack 3.2.4-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-ruby-rack-3.2.4-1ubuntu1.md) | Feb 18, 2026 |

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Data as of 2026-11-09T01:18:40Z 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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