Use After Free Affecting aiohttp package, versions [,3.14.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-AIOHTTP-18517003
- published4 Aug 2026
- disclosed3 Aug 2026
- creditStefan Agner
Introduced: 3 Aug 2026
NewCVE-2026-69244 (opens in a new tab)How to fix?
Upgrade aiohttp to version 3.14.3 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free in the C HTTP response parser error handling. An attacker can cause the application to crash or become unresponsive by sending a specially crafted malformed chunked response.
Workaround
This vulnerability can be mitigated by setting the environment variable AIOHTTP_NO_EXTENSIONS=1 to use the Python parser instead of the C extensions.