Ubuntu USN · USN-8591-1

AIOHTTP vulnerabilities

Published: Wed, 22 Jul 2026 20:37

CVE-2026-34513CVE-2026-34514CVE-2026-22815CVE-2026-34516

Summary

Several security issues were fixed in AIOHTTP.

Details

Sean Gilligan discovered that AIOHTTP did not properly limit memory usage when processing HTTP headers and trailers. An attacker could possibly use this issue to consume excessive system resources, resulting in a denial of service. (CVE-2026-22815) It was discovered that AIOHTTP did not properly limit the size of its DNS cache. An attacker could possibly use this issue to consume excessive system resources, resulting in a denial of service. (CVE-2026-34513) Mingi Jung discovered that AIOHTTP did not properly sanitize the content_type parameter. An attacker could possibly use this issue to inject malicious HTTP headers, resulting in HTTP response splitting. (CVE-2026-34514) It was discovered that AIOHTTP did not properly limit memory usage when processing multipart headers. An attacker could possibly use this issue to consume excessive system resources, resulting in a denial of service. (CVE-2026-34516)

Recommended actions per Ubuntu release

StackPatch playbook auto-generated per release codename and per affected package.

Ubuntu bionic

python-aiohttp→3.0.1-1ubuntu0.1~esm7apt_upgrade_esm
Fixed at 3.0.1-1ubuntu0.1~esm7 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y python-aiohttp=3.0.1-1ubuntu0.1~esm7
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
python3-aiohttp→3.0.1-1ubuntu0.1~esm7apt_upgrade_esm
Fixed at 3.0.1-1ubuntu0.1~esm7 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y python3-aiohttp=3.0.1-1ubuntu0.1~esm7
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.

Ubuntu focal

python-aiohttp→3.6.2-1ubuntu1+esm6apt_upgrade
Standard apt upgrade. Install 3.6.2-1ubuntu1+esm6 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-aiohttp
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python3-aiohttp→3.6.2-1ubuntu1+esm6apt_upgrade
Standard apt upgrade. Install 3.6.2-1ubuntu1+esm6 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python3-aiohttp
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu jammy

python-aiohttp→3.8.1-4ubuntu0.2+esm3apt_upgrade
Standard apt upgrade. Install 3.8.1-4ubuntu0.2+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-aiohttp
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python-aiohttp-doc→3.8.1-4ubuntu0.2+esm3apt_upgrade
Standard apt upgrade. Install 3.8.1-4ubuntu0.2+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-aiohttp-doc
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python3-aiohttp→3.8.1-4ubuntu0.2+esm3apt_upgrade
Standard apt upgrade. Install 3.8.1-4ubuntu0.2+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python3-aiohttp
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu noble

python-aiohttp→3.9.1-1ubuntu0.1+esm3apt_upgrade
Standard apt upgrade. Install 3.9.1-1ubuntu0.1+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-aiohttp
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python-aiohttp-doc→3.9.1-1ubuntu0.1+esm3apt_upgrade
Standard apt upgrade. Install 3.9.1-1ubuntu0.1+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-aiohttp-doc
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python3-aiohttp→3.9.1-1ubuntu0.1+esm3apt_upgrade
Standard apt upgrade. Install 3.9.1-1ubuntu0.1+esm3 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python3-aiohttp
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu resolute

python-aiohttp→3.13.3-3ubuntu1+esm1apt_upgrade
Standard apt upgrade. Install 3.13.3-3ubuntu1+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-aiohttp
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python-aiohttp-doc→3.13.3-3ubuntu1+esm1apt_upgrade
Standard apt upgrade. Install 3.13.3-3ubuntu1+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python-aiohttp-doc
```
Most apt upgrades restart their service automatically. needrestart lists anything else.
python3-aiohttp→3.13.3-3ubuntu1+esm1apt_upgrade
Standard apt upgrade. Install 3.13.3-3ubuntu1+esm1 from the apt repo.
```
sudo apt-get update
sudo apt-get install --only-upgrade -y python3-aiohttp
```
Most apt upgrades restart their service automatically. needrestart lists anything else.

Ubuntu xenial

python-aiohttp→0.20.2-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 0.20.2-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y python-aiohttp=0.20.2-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.
python3-aiohttp→0.20.2-1ubuntu0.1~esm1apt_upgrade_esm
Fixed at 0.20.2-1ubuntu0.1~esm1 — ESM-only. Enable Ubuntu Pro (free for 5 personal machines) or treat as watch item.
```
sudo pro attach <token>
sudo apt-get update
sudo apt-get install --only-upgrade -y python3-aiohttp=0.20.2-1ubuntu0.1~esm1
```
Sign up at https://ubuntu.com/pro. Free for personal + small-team use.

Are YOU affected by USN-8591-1?

5-second check on your actual server. Reads /etc/os-release, uname -r, and dpkg-query; matches against the live USN + Debian Security Tracker feeds; tells you whether USN-8591-1 (and any other live CVE) applies. Anonymous, no signup.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan Read the bash source first

Want this automated for your servers?

StackPatch runs this match against YOUR installed packages every hour

Free (3 servers) / from $9/mo (14-day free trial) / Solo $9/mo / Pro $29/mo / Team $79/mo. Indie pricing.

Start free trial →See StackPatch →Live audit log →