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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| aio-libs | aiohttp | < 3.12.14 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | python-aiohttp | 3.12.15-1 | — |
| Debian 13 | python-aiohttp | No fix yet | — |
| Debian 12 | python-aiohttp | 3.8.4-1+deb12u2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | python-aiohttp | No fix yet | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | python-aiohttp | No fix yet | — |
| Ubuntu Pro 24.04 LTS | python-aiohttp | No fix yet | — |
| Ubuntu Pro 22.04 LTS | python-aiohttp | No fix yet | — |
| Ubuntu Pro 20.04 LTS | python-aiohttp | No fix yet | — |
| Ubuntu Pro 18.04 LTS | python-aiohttp | No fix yet | — |
| Ubuntu Pro 16.04 LTS | python-aiohttp | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Satellite Capsule 6 | python3.12-aiohttp | 3.13.3-1.el9pc | RHSA-2026:2760 |
| Red Hat Satellite Capsule 6 | python3.12-urllib3 | 2.6.3-1.el9pc | RHSA-2026:2760 |
| Red Hat Satellite 6 | python3.12-aiohttp | 3.13.3-1.el9pc | RHSA-2026:2760 |
| Red Hat Satellite 6 | python3.12-urllib3 | 2.6.3-1.el9pc | RHSA-2026:2760 |
| Red Hat Ansible Automation Platform Inside 2 | receptor | 1.6.3-1.el8ap | RHSA-2026:1506, RHSA-2026:1249 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Ansible Automation Platform Developer 2 | python3.11-django | 4.2.27-1.el8ap | RHSA-2026:1506, RHSA-2026:1249 |
| Red Hat Ansible Automation Platform Developer 2 | python3.11-urllib3 | 2.6.3-1.el8ap | RHSA-2026:1506, RHSA-2026:1249 |
| Red Hat Ansible Automation Platform Developer 2 | receptor | 1.6.3-1.el8ap | RHSA-2026:1506, RHSA-2026:1249 |
| Red Hat Ansible Automation Platform 2 | automation-controller-venv-tower | 4.6.25-1.el8ap | RHSA-2026:1506, RHSA-2026:1249 |
| Red Hat Ansible Automation Platform 2 | python3.11-django | 4.2.27-1.el8ap | RHSA-2026:1506, RHSA-2026:1249 |
| Red Hat Ansible Automation Platform 2 | python3.11-protobuf | 4.25.8-1.el9ap | RHSA-2026:1249 |
| Red Hat Ansible Automation Platform 2 | python3.11-urllib3 | 2.6.3-1.el8ap | RHSA-2026:1506, RHSA-2026:1249 |
| Red Hat Ansible Automation Platform 2 | receptor | 1.6.3-1.el8ap | RHSA-2026:1506, RHSA-2026:1249 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | python-aiohttp | 3.6.0-150100.3.27.1 | SUSE-SU-2025:03201-1 |
| SLES 15 SP6 | python-aiohttp | 3.6.0-150100.3.27.1 | SUSE-SU-2025:03201-1 |
| SLES 15 SP5 | python-aiohttp | 3.6.0-150100.3.27.1 | SUSE-SU-2025:03201-1 |
| SLES 15 SP4 | python-aiohttp | 3.6.0-150100.3.27.1 | SUSE-SU-2025:03201-1, SUSE-SU-2025:03057-1 |
| SLES 15 SP3 | python-aiohttp | 3.6.0-150100.3.27.1 | SUSE-SU-2025:03201-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 3 | python-aiohttp | 3.9.3-150400.10.33.1 | SUSE-SU-2025:03057-1 |
| SLES for SAP 16.0 | python-Brotli | 1.1.0-160000.3.1 | SUSE-SU-2026:20425-1 |
| SLES for SAP 16.0 | python-aiohttp | 3.11.16-160000.3.1 | SUSE-SU-2026:20425-1 |
| SLES 16.0 | python-Brotli | 1.1.0-160000.3.1 | SUSE-SU-2026:20425-1 |
| SLES 16.0 | python-aiohttp | 3.11.16-160000.3.1 | SUSE-SU-2026:20425-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | python-Brotli | 1.1.0-160000.3.1 | openSUSE-SU-2026:20204-1 |
| openSUSE Leap 16.0 | python-aiohttp | 3.11.16-160000.3.1 | openSUSE-SU-2026:20204-1 |
| openSUSE Leap 15.6 | python-aiohttp | 3.9.3-150400.10.33.1 | SUSE-SU-2025:03057-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | python-aiohttp | No fix yet | — |
| Azure Linux 2 (CBL-Mariner) | python-aiohttp | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | python39-oci-sdk +1 | 2.187.0-1.0.5.el9 | ELSA-2026-604898 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | airflow-3 | 3.2.0-r0 | — |
| Wolfi rolling | airflow-3-bitnami-compat | No fix yet | — |
| Wolfi rolling | dask-kubernetes | 2025.7.0-r1 | — |
| Wolfi rolling | py3-cassandra-medusa +1 | 0.24.1-r1 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | aiohttp | < 3.12.14 | 3.12.14 | GHSA-9548-qrrj-x5pj |
Advisories 14
- WID-SEC-2026-3046 IBM Concert: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026
- WID-SEC-2025-2798 Red Hat OpenShift Service Mesh: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 22, 2026
- ELSA-2026-604898 Important: python-oci-sdk security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 21, 2026
- RHSA-2026:2760 Red Hat Security Advisory: Satellite 6.18.3 Async Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:1506 Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.5 Product Security and Bug Fix Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:1249 Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- WID-SEC-2026-1212 Oracle Utilities Applications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 21, 2026
- openSUSE-SU-2026:20204-1 Security update for python-aiohttp, python-Brotli SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20425-1 Security update for python-aiohttp, python-Brotli SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:03057-1 Security update for python-aiohttp SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:03201-1 Security update for python-aiohttp SUSE / openSUSE Security Updates · Mar 23, 2026
- WID-SEC-2026-0165 Oracle Siebel CRM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 20, 2026
- WID-SEC-2025-2361 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 17, 2025
- NCSC-2025-0330 Kwetsbaarheden verholpen in Oracle Communications producten NCSC-NL (Netherlands) · Oct 23, 2025