# actionpack is vulnerable to denial of service via a crafted HTTP Accept header

Advisory record · `GHSA-ffpv-c4hm-3x6v`

- **Identifiers:** `GHSA-ffpv-c4hm-3x6v` · `CVE-2016-0751`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **Published:** 24 Oct 2017
- **Updated:** 29 Nov 2024
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 24 Oct 2017, 18:33 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `actionpack` (RubyGems): affected `>=4.2.0, <4.2.5.1 || <3.2.22.1 || >=4.0.0, <4.1.14.1`; fixed in `4.2.5.1`, `3.2.22.1`, `4.1.14.1`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 7.5 High, CVSS 3.0: `CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.097, the 95th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 24 Oct 2017. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-ffpv-c4hm-3x6v](https://github.com/advisories/GHSA-ffpv-c4hm-3x6v)
- [OSV: GHSA-ffpv-c4hm-3x6v](https://osv.dev/vulnerability/GHSA-ffpv-c4hm-3x6v)
- <https://nvd.nist.gov/vuln/detail/CVE-2016-0751>
- <https://github.com/rails/rails/commit/127967b735813cd4f263df7a50426d74e7e9cc17>
- <https://github.com/rails/rails/commit/221937c8ba1d291430ceddebbd4bdef7d3cb47d6>
- <https://github.com/rails/rails/commit/37047b779a177b911c7161052cfc34a30e1db0af>
- <https://github.com/rails/rails>
- <https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2016-0751.yml>
- <https://groups.google.com/forum/#!topic/rubyonrails-security/9oLY_FCzvoc>
- <https://groups.google.com/forum/message/raw?msg=ruby-security-ann/9oLY_FCzvoc/5CDXbvpYEgAJ>
- <https://web.archive.org/web/20160128201702/http://www.securitytracker.com/id/1034816>
- <https://web.archive.org/web/20200227181647/http://www.securityfocus.com/bid/81800>
- <http://lists.fedoraproject.org/pipermail/package-announce/2016-February/178043.html>
- <http://lists.fedoraproject.org/pipermail/package-announce/2016-February/178067.html>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-ffpv-c4hm-3x6v>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-ffpv-c4hm-3x6v/>. Everything for agents: <https://agentprime.io/llms.txt>.