CVE-2026-50269
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.0, attacker-controlled input included into multipart/payload headers can be used to modify a request to inject additional headers or similar. In the unlikely situation that an application is passing user-controlled strings into MultipartWriter.append(headers=...) or Payload.headers, then an attacker may be able to modify the request to inject headers or change the contents of the request. This vulnerability is fixed in 3.14.0.
Scoring
- Severity
- LOW
- CVSS base score
- 2.7
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
- EPSS probability
- 0.30%
- CWE
- CWE-93, CWE-113
- Published
- 2026-06-22
- Last modified
- 2026-06-22
Affected products
- aio-libs aiohttp
Weakness type
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