CVE-2026-111748
mediumpriority · track · 0EPSS 0.004 · 33 %ileUSEPSS · scored 2026-10-27
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 attacker-controlled request-target scheme data instead of the connection protocol. Applications that use Request.scheme for security decisions can consequently be tricked into treating an unencrypted connection as encrypted or an encrypted connection as unencrypted. This issue is fixed in version 3.14.4.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.7–6.3
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
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affected products (1)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- GHSA-f9xw-jh8m-3mwqAIOHTTP: Absolute-form request targets can spoof Request.scheme2026-10-20ghsa · osvUS
### 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).
sources
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references (3) nvd
External citations — patches, advisories, analysis.
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