Description
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. In versions 3.13.2 and below, reading multiple invalid cookies can lead to a logging storm. If the cookies attribute is accessed in an application, then an attacker may be able to trigger a storm of warning-level logs using a specially crafted Cookie header. This issue is fixed in 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 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | python-aiohttp | No fix yet | — |
| Ubuntu 24.04 LTS | python-aiohttp | No fix yet | — |
| Ubuntu 22.04 LTS | python-aiohttp | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python-aiohttp | 3.13.3-1.1 | openSUSE-SU-2026:10025-1 |
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 | — |
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-fh55-r93g-j68g |
Advisories 1
- openSUSE-SU-2026:10025-1 python311-aiohttp-3.13.3-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026