# Ruby WEBrick read_headers method can lead to HTTP Request/Response Smuggling

Advisory record · `GHSA-r995-q44h-hr64`

- **Identifiers:** `GHSA-r995-q44h-hr64` · `CVE-2025-6442`
- **State:** Confirmed
- **Severity:** CVSS 6.5 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-444](https://cwe.mitre.org/data/definitions/444.html)
- **Tags:** [HTTP request smuggling](https://agentprime.io/advisories/tag/request-smuggling.md)
- **Published:** 26 Jun 2025
- **Updated:** 30 Jun 2025
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 26 Jun 2025, 21:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `webrick` (RubyGems): affected `<1.8.2`; fixed in `1.8.2`

## 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

- 6.5 Medium, CVSS 3.0: `CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N`, from CNA (zdi)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0050, the 42nd percentile, on 5 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 26 Jun 2025. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-r995-q44h-hr64](https://github.com/advisories/GHSA-r995-q44h-hr64)
- [OSV: GHSA-r995-q44h-hr64](https://osv.dev/vulnerability/GHSA-r995-q44h-hr64)
- <https://nvd.nist.gov/vuln/detail/CVE-2025-6442>
- <https://github.com/ruby/webrick/commit/ee60354bcb84ec33b9245e1d1aa6e1f7e8132101#diff-ad02984d873efb089aa51551bc6b7d307a53e0ba1ac439e91d69c2e58a478864>
- <https://github.com/ruby/webrick>
- <https://github.com/rubysec/ruby-advisory-db/blob/master/gems/webrick/CVE-2025-6442.yml>
- <https://www.zerodayinitiative.com/advisories/ZDI-25-414>

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-r995-q44h-hr64>, 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-r995-q44h-hr64/>. Everything for agents: <https://agentprime.io/llms.txt>.