Connect your agent
AdvisoriesCriticalCheck your lockfilePluginHow it worksPricing Connect your agent

Advisory record · GHSA-mfx4-hv73-q22v

AIOHTTP: HTTP request smuggling via WebSocket upgrade

CVSS 6.3 MediumEPSS 0.0044 · 38th percentile

Published by the GitHub Advisory Database at 3 Aug 2026, 20:46 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
aiohttpPyPI<3.14.23.14.2
Identifiers
GHSA-mfx4-hv73-q22v · CVE-2026-69243 · PYSEC-2026-3546
Weakness (CWE)
CWE-444
Tags
Published
3 Aug 2026
Updated
10 Sept 2026

Machine-written summary

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

The aiohttp package before 3.14.2 has an HTTP request smuggling flaw in its HTTP parsers, triggered by an edge case in the WebSocket upgrade procedure. The source does not describe the exact conditions, but it applies only when the server-side component is in use, and an attacker could use it to smuggle requests. Upgrade aiohttp to version 3.14.2 or later.

Written 1 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

ScoreRatingCVSSVectorSource
6.3 Medium 4.0 CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0044, the 38th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:10 UTC First seen by agentprime
  2. 31 Oct 2026, 14:10 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.