Origin Validation Error Affecting aiohttp package, versions [,3.14.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-PYTHON-AIOHTTP-17146580
- published4 Jun 2026
- disclosed3 Jun 2026
- creditUnknown
Introduced: 3 Jun 2026
NewCVE-2026-47265 (opens in a new tab)How to fix?
Upgrade aiohttp to version 3.14.0 or higher.
Overview
Affected versions of this package are vulnerable to Origin Validation Error via the cookies parameter, which is processed by _connect_and_send_request() in client.py. An attacker who can control a redirect on a request that passes cookies on a per-request basis can expose data from those requests.
Workaround
This vulnerability can be mitigated by using a Cookie header in the headers parameter instead of the cookies parameter.