GHSA-8qpw-xqxj-h4r2: aiohttp (CVE-2024-23829)

Package	Ecosystem	Affected	Fixed in
aiohttp	PyPI	<3.9.2	3.9.2

Machine-written summary

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

aiohttp versions before 3.9.2 have an overly lenient Python HTTP parser (used when llhttp is not in use) that accepts some malformed separators, HTTP version digits, and method or header names that should be rejected. An attacker who can send crafted requests to a server, possibly through a proxy, could use this to smuggle requests, or to trigger unhandled exceptions that consume excessive resources. Upgrade aiohttp to version 3.9.2 or later. The source gives few details on specific exploitation.

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

Score	Rating	CVSS	Vector	Source
6.5	Medium	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.010, the 63rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:36 UTC First seen by agentprime
31 Oct 2026, 14:36 UTC Confirmed by OSV

Sources

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.