Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below contain parser logic which allows non-ASCII decimals to be present in the Range header. There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. This issue is fixed in version 3.13.3.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| aio-libs | aiohttp | < 3.13.3 | — |
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 | 3.13.3-1 | — |
| Debian 13 | python-aiohttp | 3.11.16-1+deb13u1 | — |
| Debian 12 | python-aiohttp | 3.8.4-1+deb12u2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | python-aiohttp | 3.11.16-1ubuntu0.1 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | python-aiohttp | 3.9.1-1ubuntu0.1+esm2 | — |
| Ubuntu Pro 22.04 LTS | python-aiohttp | 3.8.1-4ubuntu0.2+esm2 | — |
| Ubuntu Pro 18.04 LTS | python-aiohttp | 3.0.1-1ubuntu0.1~esm6 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | python-aiohttp | 3.6.0-150100.3.32.1 | SUSE-SU-2026:0859-1 |
| SLES 15 SP6 | python-aiohttp | 3.6.0-150100.3.32.1 | SUSE-SU-2026:0859-1, SUSE-SU-2026:0858-1 |
| SLES 15 SP5 | python-aiohttp | 3.6.0-150100.3.32.1 | SUSE-SU-2026:0859-1, SUSE-SU-2026:0858-1 |
| SLES 15 SP4 | python-aiohttp | 3.6.0-150100.3.32.1 | SUSE-SU-2026:0859-1, SUSE-SU-2026:0858-1 |
| SLES 3 | python-aiohttp | 3.9.3-150400.10.36.1 | SUSE-SU-2026:0858-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 for SAP 15 SP6 | python-aiohttp | 3.9.3-150400.10.36.1 | SUSE-SU-2026:0858-1 |
| SLES for SAP 15 SP5 | python-aiohttp | 3.9.3-150400.10.36.1 | SUSE-SU-2026:0858-1 |
| SLES for SAP 15 SP4 | python-aiohttp | 3.9.3-150400.10.36.1 | SUSE-SU-2026:0858-1 |
| 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 |
| SLE HPC 15 SP5 | python-aiohttp | 3.9.3-150400.10.36.1 | SUSE-SU-2026:0858-1 |
| SLE HPC 15 SP4 | python-aiohttp | 3.9.3-150400.10.36.1 | SUSE-SU-2026:0858-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python-aiohttp | 3.13.3-1.1 | openSUSE-SU-2026:10025-1 |
| 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 | 3.9.3-150400.10.36.1 | SUSE-SU-2026:0858-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | py3-aiohttp | 3.13.3-r0 | — |
| Alpine v3.23 | py3-aiohttp | 3.13.3-r0 | — |
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 | 3.1.5-r2 | — |
| Wolfi rolling | airflow-3-bitnami-compat | No fix yet | — |
| Wolfi rolling | checkov | 3.2.499-r0 | — |
| Wolfi rolling | dask-kubernetes | 2025.7.0-r4 | — |
| Wolfi rolling | kserve-storage-controller | 0.17.0-r2 | — |
| Wolfi rolling | kubeflow-pipelines-visualization-server | 2.15.0-r1 | — |
| Wolfi rolling | open-webui | 0.6.43-r1 | — |
| Wolfi rolling | py3-cassandra-medusa +1 | 0.26.0-r3 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | aiohttp | < 3.13.3 | 3.13.3 | GHSA-mqqc-3gqh-h2x8 |
Advisories 6
- ELSA-2026-604898 Important: python-oci-sdk security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 21, 2026
- openSUSE-SU-2026:20204-1 Security update for python-aiohttp, python-Brotli SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2026:10025-1 python311-aiohttp-3.13.3-1.1 on GA media 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-2026:0859-1 Security update for python-aiohttp SUSE / openSUSE Security Updates · Mar 13, 2026
- SUSE-SU-2026:0858-1 Security update for python-aiohttp SUSE / openSUSE Security Updates · Mar 13, 2026