Input validation error in aiohttp - CVE-2026-59881

Vulnerability identifier: #VU139887

CSH Severity: Medium

CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-59881

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

aiohttp
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Desktop 15
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
Public Cloud Module
Python 3 Module
openSUSE Leap
openEuler
Fedora
python311-aiohttp-debuginfo
python-aiohttp-debugsource
python311-aiohttp
python-aiohttp
python3-aiohttp
python-aiohttp-help
python-aiohttp-debuginfo

Install updates from vendor's website.

aiohttp - update to 3.14.2
python311-aiohttp-debuginfo - update to 3.9.3-150400.10.46.1
python-aiohttp-debugsource - update to 3.9.3-150400.10.46.1
python311-aiohttp - update to 3.9.3-150400.10.46.1
python-aiohttp - update to 3.14.3-1
python3-aiohttp - update to 3.14.3-1
python-aiohttp-help - update to 3.14.3-1
python-aiohttp-debugsource - update to 3.14.3-1
python-aiohttp-debuginfo - update to 3.14.3-1
python-aiohttp - addressed in versions 3.14.3-3.fc45, 3.14.3-3.fc46

• https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mq44-7p77-q5h7

• Multiple vulnerabilities in aiohttp
• openEuler 24.03 LTS SP1 update for python-aiohttp
• openEuler 24.03 LTS SP4 update for python-aiohttp
• openEuler 24.03 LTS SP3 update for python-aiohttp
• Fedora 46 update for python-aiohttp
• Fedora 45 update for python-aiohttp
• SUSE update for python-aiohttp