AIOHTTP: Absolute-Form Request Targets Can Spoof Request.scheme
Summary
An attacker sending an absolute-form HTTP request can spoof the scheme used.
Impact
If user code depends on the Request.scheme attribute for anything security-related, an attacker may be able to circumvent this logic, tricking the application into thinking a connection is encrypted when it is not, or vice versa.
Workaround
Configure a Web Application Firewall (WAF) rule to reject absolute-form requests (legitimate requests should only use this form for proxies).
What to do
Upgrade aiohttp to version 3.14.4 or later. If upgrading immediately is not possible, apply a WAF rule to reject absolute-form requests.
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-f9xw-jh8m-3mwq
- https://nvd.nist.gov/vuln/detail/CVE-2026-111748
- https://github.com/aio-libs/aiohttp/commit/6d4e7b01f9b951aa084a75d7356e907d4ee80411
- 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:L/VI:L/VA:N/SC:N/SI:N/SA:N- Weakness (CWE)
CWE-807- Platform
- Python (PyPI)
- Package
aiohttp- Disclosed
- 20.10.2026
- Updated
- 20.10.2026 23:23
Sources and licenses · Edited or translated by DockRay; source rights and applicable licenses are retained.
OSV / GitHub Advisory Database - GHSA-f9xw-jh8m-3mwq - 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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AIOHTTP: Absolute-Form Request Targets Can Spoof Request.scheme this entry
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