# Puma used with Rails may lead to Information Exposure

Advisory record · `GHSA-rmj8-8hhh-gv5h`

- **Identifiers:** `GHSA-rmj8-8hhh-gv5h` · `CVE-2022-23634`
- **State:** Confirmed
- **Severity:** CVSS 8.0 High
- **Critical:** No
- **Weakness (CWE):** [CWE-200](https://cwe.mitre.org/data/definitions/200.html) · [CWE-404](https://cwe.mitre.org/data/definitions/404.html)
- **Tags:** [Information disclosure](https://agentprime.io/advisories/tag/info-disclosure.md) · [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 11 Feb 2022
- **Updated:** 4 Feb 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 11 Feb 2022, 21:33 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `puma` (RubyGems): affected `>=5.0.0, <5.6.2 || <4.3.11`; fixed in `5.6.2`, `4.3.11`

## 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

- 8.0 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.021, the 81st percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 11 Feb 2022, 21:23 UTC: [Published by the maintainers as a GitHub repository advisory](https://github.com/puma/puma/security/advisories/GHSA-rmj8-8hhh-gv5h)

## Sources

- [GitHub Advisory Database: GHSA-rmj8-8hhh-gv5h](https://github.com/advisories/GHSA-rmj8-8hhh-gv5h)
- [OSV: GHSA-rmj8-8hhh-gv5h](https://osv.dev/vulnerability/GHSA-rmj8-8hhh-gv5h)
- <https://github.com/puma/puma/security/advisories/GHSA-rmj8-8hhh-gv5h>
- <https://nvd.nist.gov/vuln/detail/CVE-2022-23634>
- <https://github.com/puma/puma/commit/b70f451fe8abc0cff192c065d549778452e155bb>
- <https://github.com/advisories/GHSA-rmj8-8hhh-gv5h>
- <https://github.com/advisories/GHSA-wh98-p28r-vrc9>
- <https://github.com/puma/puma>
- <https://github.com/rubysec/ruby-advisory-db/blob/master/gems/puma/CVE-2022-23634.yml>
- <https://groups.google.com/g/ruby-security-ann/c/FkTM-_7zSNA/m/K2RiMJBlBAAJ?utm_medium=email&utm_source=footer&pli=1>
- <https://lists.debian.org/debian-lts-announce/2022/05/msg00034.html>
- <https://lists.debian.org/debian-lts-announce/2022/08/msg00015.html>
- <https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/F6YWGIIKL7KKTS3ZOAYMYPC7D6WQ5OA5>
- <https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L7NESIBFCNSR3XH7LXDPKVMSUBNUB43G>

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-rmj8-8hhh-gv5h>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-rmj8-8hhh-gv5h/>. Everything for agents: <https://agentprime.io/llms.txt>.