Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the HTTP parsers were vulnerable to a request smuggling attack relating to WebSocket upgrades. If using the server-side component, an attacker may be able to execute a request smuggling vulnerability using an edge case in the WebSocket upgrade procedure. A WebSocket upgrade request with a body could cause the parser to switch protocols before the complete request body was received, leaving trailing bytes to be handled as upgraded-protocol or pipelined data rather than normal HTTP body data. This issue is fixed in version 3.14.2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| aio-libs | aiohttp | < 3.14.2 | — |
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 | 3.14.3-1 | — |
| 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 26.10 | 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 Utils 6 | rubygem-jwt | 2.10.3-1.el8sat | RHSA-2026:63387, RHSA-2026:63386, RHSA-2026:63385 |
| Red Hat Satellite Maintenance 6 | ansible-core | 1:2.16.19-1.el9sat | RHSA-2026:63387, RHSA-2026:63386, RHSA-2026:63385 |
| Red Hat Satellite Capsule 6 | ansible-core +1 | 1:2.16.19-1.el9sat | RHSA-2026:63387, RHSA-2026:63386, RHSA-2026:63385 |
| Red Hat Satellite Capsule 6 | openvox-server | 8.15.2-1.el8sat | RHSA-2026:63387, RHSA-2026:63386, RHSA-2026:63385 |
| Red Hat Satellite Capsule 6 | pulpcore-obsolete-packages | 1.3.1-5.el9pc | RHSA-2026:63386 |
| Red Hat Satellite Capsule 6 | python-aiohttp +1 | 3.14.3-1.el8pc | RHSA-2026:63387, RHSA-2026:63327 |
| Red Hat Satellite Capsule 6 | python3.12-aiohttp | 3.14.3-1.el9pc | RHSA-2026:63386, RHSA-2026:63385 |
| Red Hat Satellite Capsule 6 | python3.12-gitpython | 3.1.59-1.el9pc | RHSA-2026:63385 |
| Red Hat Satellite Capsule 6 | python3.12-pulpcore | 3.73.30-3.el9pc | RHSA-2026:63386 |
| Red Hat Satellite Capsule 6 | rubygem-jwt | 2.10.3-1.el8sat | RHSA-2026:63387, RHSA-2026:63386, RHSA-2026:63385 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Satellite 6 | ansible-core +1 | 1:2.16.19-1.el9sat | RHSA-2026:63387, RHSA-2026:63386, RHSA-2026:63385 |
| Red Hat Satellite 6 | openvox-server | 8.15.2-1.el8sat | RHSA-2026:63387, RHSA-2026:63386, RHSA-2026:63385 |
| Red Hat Satellite 6 | pulpcore-obsolete-packages | 1.3.1-5.el9pc | RHSA-2026:63386 |
| Red Hat Satellite 6 | python-aiohttp +1 | 3.14.3-1.el8pc | RHSA-2026:63387, RHSA-2026:63327 |
| Red Hat Satellite 6 | python3.12-aiohttp | 3.14.3-1.el9pc | RHSA-2026:63386, RHSA-2026:63385 |
| Red Hat Satellite 6 | python3.12-gitpython | 3.1.59-1.el9pc | RHSA-2026:63385 |
| Red Hat Satellite 6 | python3.12-pulpcore | 3.73.30-3.el9pc | RHSA-2026:63386 |
| Red Hat Satellite 6 | rubygem-jwt | 2.10.3-1.el8sat | RHSA-2026:63387, RHSA-2026:63386, RHSA-2026:63385 |
| Red Hat Ansible Automation Platform Developer 2 | automation-controller-cli | 4.6.32-1.el8ap | RHSA-2026:59136, RHSA-2026:59135 |
| Red Hat Ansible Automation Platform Developer 2 | python-django +1 | 5.2.17-1.el10ap | RHSA-2026:59136 |
| Red Hat Ansible Automation Platform Developer 2 | python3.12-django | 5.2.17-1.el8ap | RHSA-2026:59136, RHSA-2026:59135 |
| Red Hat Ansible Automation Platform 2 | automation-controller-cli +1 | 4.6.32-1.el8ap | RHSA-2026:59136, RHSA-2026:59135 |
| Red Hat Ansible Automation Platform 2 | automation-gateway-server | 2.5.20260824-1.el8ap | RHSA-2026:59135 |
| Red Hat Ansible Automation Platform 2 | automation-platform-ui | 2.6.13-1.el9ap | RHSA-2026:59136 |
| Red Hat Ansible Automation Platform 2 | python-django +1 | 5.2.17-1.el10ap | RHSA-2026:59136 |
| Red Hat Ansible Automation Platform 2 | python3.12-aiohttp | 3.14.3-1.el8ap | RHSA-2026:59136, RHSA-2026:59135 |
| Red Hat Ansible Automation Platform 2 | python3.12-django | 5.2.17-1.el8ap | RHSA-2026:59136, RHSA-2026:59135 |
| Red Hat Ansible Automation Platform 2 | python3.12-gitpython | 3.1.59-1.el8ap | RHSA-2026:59136, RHSA-2026:59135 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | python-aiohttp | 3.6.0-150100.3.41.1 | SUSE-SU-2026:4113-1 |
| SLES 15 SP6 | python-aiohttp | 3.6.0-150100.3.41.1 | SUSE-SU-2026:4113-1 |
| SLES 15 SP5 | python-aiohttp | 3.6.0-150100.3.41.1 | SUSE-SU-2026:4113-1 |
| SLES 15 SP4 | python-aiohttp | 3.6.0-150100.3.41.1 | SUSE-SU-2026:4113-1, SUSE-SU-2026:4031-1 |
| SLES 3 | python-aiohttp | 3.9.3-150400.10.46.1 | SUSE-SU-2026:4031-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | python-aiohttp | 3.11.16-160000.7.1 | SUSE-SU-2026:23571-1 |
| SLES 16.0 | python-aiohttp | 3.11.16-160000.7.1 | SUSE-SU-2026:23571-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python-aiohttp | 3.14.3-1.1 | openSUSE-SU-2026:11467-1 |
| openSUSE Leap 16.0 | python-aiohttp | 3.11.16-160000.7.1 | openSUSE-SU-2026:21687-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | 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 | 3.3.0-r4 | — |
| Wolfi rolling | dask-kubernetes | 2026.3.0-r11 | — |
| Wolfi rolling | kserve +2 | 0.20.0-r7 | — |
| Wolfi rolling | open-webui | 0.11.0-r6 | — |
| Wolfi rolling | py3-cassandra-medusa | 0.29.1-r1 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
JVBotelho/cve-2026-69243-poc-aiohttp-smuggling ★ 1 · Aug 4, 2026
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | aiohttp | < 3.14.2 | 3.14.2 | GHSA-mfx4-hv73-q22v |
Advisories 12
- ELSA-2026-604898 Important: python-oci-sdk security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 21, 2026
- RHSA-2026:63387 Red Hat Security Advisory: Satellite 6.17.11 Async Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:63386 Red Hat Security Advisory: Satellite 6.18.9 Async Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:63385 Red Hat Security Advisory: Satellite 6.19.4 Async Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:63327 Red Hat Security Advisory: Satellite 6.16.13 Async Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:59135 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-2026:59136 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
- SUSE-SU-2026:23571-1 Security update for python-aiohttp SUSE / openSUSE Security Updates · Sep 29, 2026
- SUSE-SU-2026:4113-1 Security update for python-aiohttp SUSE / openSUSE Security Updates · Sep 14, 2026
- SUSE-SU-2026:4031-1 Security update for python-aiohttp SUSE / openSUSE Security Updates · Sep 13, 2026
- openSUSE-SU-2026:21687-1 Security update for python-aiohttp SUSE / openSUSE Security Updates · Aug 31, 2026
- openSUSE-SU-2026:11467-1 python313-aiohttp-3.14.3-1.1 on GA media SUSE / openSUSE Security Updates · Aug 7, 2026