# CVE-2026-50269: python-aiohttp: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python

CVE-2026-50269 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-50269, released June 24, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-50269
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0053
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-aiohttp Debian 12.15 (bookworm) | 3.8.4-1+deb12u2 | [DEBIAN-CVE-2026-50269](https://patchblox.com/security/data/fix/linux/debian-cve-2026-50269.md) | Jun 24, 2026 |
| Linux | python-aiohttp Debian 14 | 3.14.0-1 | [DEBIAN-CVE-2026-50269](https://patchblox.com/security/data/fix/linux/debian-cve-2026-50269.md) | Jun 24, 2026 |
| Linux | python-aiohttp opensuse-leap 16.0 | 3.11.16-160000.6.1 | [OPENSUSE-SU-2026:21372-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21372-1.md) | Jul 18, 2026 |
| Linux | python-aiohttp sles 15.6 | 3.6.0-150100.3.38.1 | [SUSE-SU-2026:3208-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3208-1.md) | Jul 23, 2026 |
| Linux | python-aiohttp sles 15.7 | 3.6.0-150100.3.38.1 | [SUSE-SU-2026:3208-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3208-1.md) | Jul 23, 2026 |
| Linux | python-aiohttp sles 16.0 | 3.11.16-160000.6.1 | [SUSE-SU-2026:22819-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22819-1.md) | Jul 18, 2026 |
| Linux | python39-oci-sdk ol 9 | 0:2.187.0-1.0.5.el9 | [ELSA-2026-604898](https://patchblox.com/security/data/fix/linux/elsa-2026-604898.md) | Nov 7, 2026 |
| Linux | python39-oci-sdk-docs ol 9 | 0:2.187.0-1.0.5.el9 | [ELSA-2026-604898](https://patchblox.com/security/data/fix/linux/elsa-2026-604898.md) | Nov 7, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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