Description
aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.10.11, the Python parser parses newlines in chunk extensions incorrectly which can lead to request smuggling vulnerabilities under certain conditions. 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 3.10.11 fixes the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| aio-libs | aiohttp | < 3.10.11 | — |
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 | 3.10.11-1 | — |
| Debian 13 | python-aiohttp | 3.10.11-1 | — |
| Debian 12 | python-aiohttp | 3.8.4-1+deb12u1 | DSA-5828-1 |
| Debian 11 | python-aiohttp | 3.7.4-1+deb11u1 | DLA-4041-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | python-aiohttp | 3.9.1-1ubuntu0.1+esm1 | USN-7642-1 |
| Ubuntu Pro 22.04 LTS | python-aiohttp | 3.8.1-4ubuntu0.2+esm1 | USN-7642-1 |
| Ubuntu Pro 20.04 LTS | python-aiohttp | 3.6.2-1ubuntu1+esm4 | USN-7642-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | python-aiohttp | 3.0.1-1ubuntu0.1~esm5 | USN-7642-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Satellite Capsule 6 | python-aiohttp +1 | 3.10.11-1.el8pc | RHSA-2024:11574 |
| Red Hat Satellite 6 | python-aiohttp +1 | 3.10.11-1.el8pc | RHSA-2024:11574 |
| Red Hat Ansible Automation Platform Inside 2 | receptor +1 | 1.5.1-2.el8ap | RHSA-2024:10766 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Ansible Automation Platform Developer 2 | receptor +1 | 1.5.1-2.el8ap | RHSA-2024:10766 |
| Red Hat Ansible Automation Platform 2 | automation-controller-venv-tower | 4.6.3-1.el8ap | RHSA-2025:0340, RHSA-2024:10766 |
| Red Hat Ansible Automation Platform 2 | automation-gateway-server | 2.5.20250115-1.el8ap | RHSA-2025:0340 |
| Red Hat Ansible Automation Platform 2 | python3.11-aiohttp | 3.10.11-1.el8ap | RHSA-2025:0340 |
| Red Hat Ansible Automation Platform 2 | receptor +1 | 1.5.1-2.el8ap | RHSA-2024:10766 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | python-aiohttp | 3.6.0-150100.3.18.1 | SUSE-SU-2024:4110-1 |
| SLES 15 SP5 | python-aiohttp | 3.6.0-150100.3.18.1 | SUSE-SU-2024:4110-1 |
| SLES 15 SP4 | python-aiohttp | 3.6.0-150100.3.18.1 | SUSE-SU-2024:4110-1, SUSE-SU-2024:4077-1 |
| SLES 15 SP3 | python-aiohttp | 3.6.0-150100.3.18.1 | SUSE-SU-2024:4110-1 |
| SLES 15 SP2 | python-aiohttp | 3.6.0-150100.3.18.1 | SUSE-SU-2024:4110-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 3 | python-aiohttp | 3.9.3-150400.10.27.1 | SUSE-SU-2024:4077-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | python-aiohttp | 3.9.3-150400.10.27.1 | SUSE-SU-2024:4077-1 |
| openSUSE Leap 15.5 | python-aiohttp | 3.6.0-150100.3.18.1 | SUSE-SU-2024:4110-1, SUSE-SU-2024:4077-1 |
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 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | airflow | 2.10.3-r2 | — |
| Wolfi rolling | checkov | 3.2.432-r0 | — |
| Wolfi rolling | dask-gateway +1 | 2024.1.0-r11 | — |
| Wolfi rolling | kserve +9 | 0.14.0-r0 | — |
| Wolfi rolling | py3-aiohttp | 3.10.11-r0 | — |
| Wolfi rolling | py3-cassandra-medusa +1 | 0.22.3-r1 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | aiohttp | < 3.10.11 | 3.10.11 | GHSA-8495-4g3g-x7pr |
Advisories 9
- RHSA-2025:0340 Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.5 Product Security and Bug Fix Update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2024:11574 Red Hat Security Advisory: Satellite 6.16.1 Async Update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2024:10766 Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.5 Product Security and Bug Fix Update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- USN-7642-1 python-aiohttp vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5828-1 python-aiohttp - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4041-1 python-aiohttp - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2024:4110-1 Security update for python-aiohttp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:4077-1 Security update for python-aiohttp SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-3584 Red Hat Ansible Automation Platform: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Feb 5, 2025