aiohttp: HTTP Request Smuggling in Pure-Python Parser
Summary
The pure-Python parser in aiohttp is vulnerable to an HTTP request smuggling attack.
Impact
If applications use the Python parser (AIOHTTP_NO_EXTENSIONS, or if a standard wheel is not installed), they may be vulnerable to a request smuggling attack.
Workaround
Switch to the default C parser.
What to do
Upgrade aiohttp to version 3.14.4 or later. Alternatively, switch to using the default C parser.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | aiohttp | < 3.14.4 | 3.14.4 |
References
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-pqxq-w44r-73xw
- https://nvd.nist.gov/vuln/detail/CVE-2026-111750
- https://github.com/aio-libs/aiohttp/commit/9b27347e61454d9f8ca2055f4c67a37dee336e83
- https://github.com/aio-libs/aiohttp
- https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L- Weakness (CWE)
CWE-444- Platform
- Python (PyPI)
- Package
aiohttp- Disclosed
- 20.10.2026
- Updated
- 20.10.2026 22:18
Sources and licenses · Edited or translated by DockRay; source rights and applicable licenses are retained.
OSV / GitHub Advisory Database - GHSA-pqxq-w44r-73xw - CC BY 4.0
Vulnerability history: aiohttp
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 55
- First → latest
- 02.2021 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 7
- Medium 29
- Low 19
Disclosures per year
- 2021: 1
- 2022: 0
- 2023: 6
- 2024: 7
- 2025: 1
- 2026: 40
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