AIOHTTP: Absolute-form request targets can spoof Request.scheme
### Summary An attacker sending an absolute-form 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 A WAF rule to reject absolute-form requests (legitimate requests should only use this form for proxies).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-111748US | — | — | ||
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, an attacker can send an absolute-form request that causes Request.scheme to use att… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/aio-libs/aiohttpPACKAGE
- https://github.com/aio-libs/aiohttp/commit/6d4e7b01f9b951aa084a75d7356e907d4ee80411WEB
- https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4WEB
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-f9xw-jh8m-3mwqWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-111748ADVISORY
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