# Netty vulnerable to request smuggling due to incorrect parsing of chunk extensions

Advisory record · `GHSA-fghv-69vj-qj49`

- **Identifiers:** `GHSA-fghv-69vj-qj49` · `CVE-2025-58056`
- **State:** Confirmed
- **Severity:** CVSS 2.9 Low
- **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:** 4 Sept 2025
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 4 Sept 2025, 17:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `io.netty:netty-codec-http` (Maven): affected `<4.1.125.Final || >=4.2.0.Alpha1, <4.2.5.Final`; fixed in `4.1.125.Final`, `4.2.5.Final`

## 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

- 2.9 Low, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0071, the 53rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:17 UTC: First seen by agentprime
- 31 Oct 2026, 14:17 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-fghv-69vj-qj49)

## Sources

- [GitHub Advisory Database: GHSA-fghv-69vj-qj49](https://github.com/advisories/GHSA-fghv-69vj-qj49)
- [OSV: GHSA-fghv-69vj-qj49](https://osv.dev/vulnerability/GHSA-fghv-69vj-qj49)
- <https://github.com/netty/netty/security/advisories/GHSA-fghv-69vj-qj49>
- <https://nvd.nist.gov/vuln/detail/CVE-2025-58056>
- <https://github.com/JLLeitschuh/unCVEed/issues/1>
- <https://github.com/netty/netty/issues/15522>
- <https://github.com/github/advisory-database/pull/6092>
- <https://github.com/netty/netty/pull/15611>
- <https://github.com/netty/netty/commit/edb55fd8e0a3bcbd85881e423464f585183d1284>
- <https://datatracker.ietf.org/doc/html/rfc9112#name-chunked-transfer-coding>
- <https://github.com/netty/netty>
- <https://w4ke.info/2025/06/18/funky-chunks.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-fghv-69vj-qj49>, 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-fghv-69vj-qj49/>. Everything for agents: <https://agentprime.io/llms.txt>.