# CVE-2025-53643: python-aiohttp: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python

CVE-2025-53643 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2025-53643, released July 14, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-53643
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0036
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 14, 2025

## Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.12.14 contains a patch for this issue.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-Brotli opensuse-leap 16.0 | 1.1.0-160000.3.1 | [OPENSUSE-SU-2026:20204-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20204-1.md) | Feb 12, 2026 |
| Linux | python-Brotli sles 16.0 | 1.1.0-160000.3.1 | [SUSE-SU-2026:20425-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20425-1.md) | Feb 12, 2026 |
| Linux | python-aiohttp Debian 12.15 (bookworm) | 3.8.4-1+deb12u2 | [DEBIAN-CVE-2025-53643](https://patchblox.com/security/data/fix/linux/debian-cve-2025-53643.md) | Jul 14, 2025 |
| Linux | python-aiohttp Debian 14 | 3.12.15-1 | [DEBIAN-CVE-2025-53643](https://patchblox.com/security/data/fix/linux/debian-cve-2025-53643.md) | Jul 14, 2025 |
| Linux | python-aiohttp opensuse-leap 15.6 | 3.9.3-150400.10.33.1 | [SUSE-SU-2025:03057-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03057-1.md) | Sep 3, 2025 |
| Linux | python-aiohttp opensuse-leap 16.0 | 3.11.16-160000.3.1 | [OPENSUSE-SU-2026:20204-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20204-1.md) | Feb 12, 2026 |
| Linux | python-aiohttp sles 15.6 | 3.6.0-150100.3.27.1 | [SUSE-SU-2025:03201-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03201-1.md) | Sep 12, 2025 |
| Linux | python-aiohttp sles 15.7 | 3.6.0-150100.3.27.1 | [SUSE-SU-2025:03201-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-03201-1.md) | Sep 12, 2025 |
| Linux | python-aiohttp sles 16.0 | 3.11.16-160000.3.1 | [SUSE-SU-2026:20425-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20425-1.md) | Feb 12, 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 |

---

Data as of 2026-11-08T00:53:09Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.