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[USN-8591-1] AIOHTTP vulnerabilities

Posted on 23 July 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8591-1
July 22, 2026

python-aiohttp vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in AIOHTTP.

Software Description:
- python-aiohttp: Asynchronous HTTP client/server Python framework

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)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
python3-aiohttp 3.13.3-3ubuntu1+esm1
Available with Ubuntu Pro

Ubuntu 24.04 LTS
python3-aiohttp 3.9.1-1ubuntu0.1+esm3
Available with Ubuntu Pro

Ubuntu 22.04 LTS
python3-aiohttp 3.8.1-4ubuntu0.2+esm3
Available with Ubuntu Pro

Ubuntu 20.04 LTS
python3-aiohttp 3.6.2-1ubuntu1+esm6
Available with Ubuntu Pro

Ubuntu 18.04 LTS
python3-aiohttp 3.0.1-1ubuntu0.1~esm7
Available with Ubuntu Pro

Ubuntu 16.04 LTS
python3-aiohttp 0.20.2-1ubuntu0.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8591-1
CVE-2026-22815, CVE-2026-34513, CVE-2026-34514, CVE-2026-34516

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