# aiohttp allows request smuggling due to incorrect parsing of chunk extensions

Advisory record · `GHSA-8495-4g3g-x7pr`

- **Identifiers:** `GHSA-8495-4g3g-x7pr` · `CVE-2024-52304` · `PYSEC-2026-1103`
- **State:** Confirmed
- **Severity:** CVSS 6.3 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:** 18 Nov 2024
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 18 Nov 2024, 21:02 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `aiohttp` (PyPI): affected `<3.10.11`; fixed in `3.10.11`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> aiohttp versions before 3.10.11 parse newlines in chunk extensions incorrectly. When aiohttp runs without its C extensions, either because they are not installed or because AIOHTTP_NO_EXTENSIONS is set, an attacker can send crafted chunked requests to smuggle requests past firewalls or proxy protections. Upgrade to aiohttp 3.10.11 or later.

Written 5 Nov 2026.

## 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

- 6.3 Medium, 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`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0056, the 47th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:35 UTC: First seen by agentprime
- 31 Oct 2026, 14:35 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-8495-4g3g-x7pr)

## Sources

- [GitHub Advisory Database: GHSA-8495-4g3g-x7pr](https://github.com/advisories/GHSA-8495-4g3g-x7pr)
- [OSV: GHSA-8495-4g3g-x7pr](https://osv.dev/vulnerability/GHSA-8495-4g3g-x7pr)
- <https://github.com/aio-libs/aiohttp/security/advisories/GHSA-8495-4g3g-x7pr>
- <https://nvd.nist.gov/vuln/detail/CVE-2024-52304>
- <https://github.com/aio-libs/aiohttp/commit/259edc369075de63e6f3a4eaade058c62af0df71>
- <https://github.com/aio-libs/aiohttp>
- <https://lists.debian.org/debian-lts-announce/2025/02/msg00002.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-8495-4g3g-x7pr>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-8495-4g3g-x7pr/>. Everything for agents: <https://agentprime.io/llms.txt>.