# CVE-2021-21305: ruby-carrierwave: CarrierWave is an open-source RubyGem which provides a simple and flexible way to upload files from Ruby applications

CVE-2021-21305 is fixed in ruby-carrierwave on 1 platform, first by ruby-carrierwave 1.2.2-1ubuntu0.1~esm1, released November 29, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-21305
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.1321
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 8, 2021

## Description

CarrierWave is an open-source RubyGem which provides a simple and flexible way to upload files from Ruby applications. In CarrierWave before versions 1.3.2 and 2.1.1, there is a code injection vulnerability. The "#manipulate!" method inappropriately evals the content of mutation option(:read/:write), allowing attackers to craft a string that can be executed as a Ruby code. If an application developer supplies untrusted inputs to the option, it will lead to remote code execution(RCE). This is fixed in versions 1.3.2 and 2.1.1.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ruby-carrierwave Ubuntu 18.04.6 LTS (bionic) | 1.2.2-1ubuntu0.1~esm1 | [ruby-carrierwave 1.2.2-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ruby-carrierwave-1.2.2-1ubuntu0.1-esm1.md) | Nov 29, 2023 |
| Linux | ruby-carrierwave Ubuntu 20.04 LTS (focal) | 1.3.1-2ubuntu0.1~esm1 | [ruby-carrierwave 1.3.1-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ruby-carrierwave-1.3.1-2ubuntu0.1-esm1.md) | Nov 29, 2023 |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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