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A GitHub-reviewed security advisory, not necessarily under active exploitation the way our CISA KEV advisories are, but a real, disclosed vulnerability in an open-source dependency.
Affected packages
Vulnerable: <= 3.14.3
Patched in 3.14.4
Details
The pure Python parser is vulnerable to an HTTP request smuggling attack.
If users are using the Python parser (AIOHTTP_NO_EXTENSIONS, or not a standard wheel installed), then an application may be vulnerable to a request smuggling attack.
Switch to the default C parser.
EPSS, exploit probability
Low0.30%
estimated chance of real-world exploitation in the next 30 days, higher than 21.8% of every CVE FIRST.org scores
Refreshed 10/20/2026, via FIRST.org's EPSS model, not CVSS, this measures likelihood of exploitation, not how severe it would be.
Talk to us about this
Find out whether this dependency (or others like it) is actually reachable in your codebase.
Get help patching, or building dependency-scanning into your pipeline going forward.
A secure code review or supply chain review finds this before an advisory does.