CVE-2026-47265
High
Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.14.0, cookies set with the `cookies` parameter on requests are sent after following a cross-origin redirect. If a developer uses the `cookies` parameter on a per-request basis then sensitive data might be leaked to an attacker if they manage to control a redirect. Version 3.14.0 patches the issue. If unable to upgrade, using a `Cookie` header in the `headers` parameter is not vulnerable.
SeverityHigh
CVSS7.5
Exploit probability—
ProductAiohttp
PublishedJun 2, 2026
First seenJun 2, 2026
Weakness typeCWE-346CWE-346
How to fix
Update
- aiohttp aiohttp3.14.0 or later
- aiohttp3.14.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| aiohttp aiohttp | v < 3.14.0 | 3.14.0 |
| aiohttpPyPI | v < 3.14.0 | 3.14.0 |
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