# CVE-2026-50269

## Summary

- **CVE ID:** CVE-2026-50269
- **Severity:** LOW
- **CVSS Score:** 2.7 (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)
- **CWE:** CWE-93, CWE-113
- **Published:** Jun 22, 2026
- **Last Modified:** Jun 22, 2026

## Description

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.

## Affected Products

- aio-libs — aiohttp (< 3.14.0)

## References

- [CNA](https://github.com/aio-libs/aiohttp/security/advisories/GHSA-m6qw-4cw2-hm4m)
- [CNA](https://github.com/aio-libs/aiohttp/commit/bf88077ebb14f4c29924b8e8904cba20c55c28b8)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 22.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._