Deserialization of Untrusted Data in aiohttp - CVE-2026-34993

Vulnerability identifier: #VU133242

CSH Severity: Medium

CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-34993

CWE-ID: CWE-502

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to execute arbitrary code.

The vulnerability exists due to deserialization of untrusted data in CookieJar.load() when loading untrusted input. A local privileged user can supply a crafted file to execute arbitrary code.

User interaction is required to load the crafted file.

aiohttp
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Desktop 15
SUSE Manager Server
SUSE Manager Proxy
SUSE Manager Retail Branch Server
Public Cloud Module
Python 3 Module
openSUSE Leap
openEuler
Fedora
python3-aiohttp-debuginfo
python-aiohttp-debugsource
python3-aiohttp
python311-aiohttp-debuginfo
python311-aiohttp
python-aiohttp-debuginfo
python-aiohttp-help
python-aiohttp

Install security update from vendor's website.

aiohttp - update to 3.14.0
python3-aiohttp-debuginfo - update to 3.6.0-150100.3.35.1
python-aiohttp-debugsource - addressed in versions 3.6.0-150100.3.35.1, 3.9.3-150400.10.43.1
python3-aiohttp - update to 3.6.0-150100.3.35.1
python311-aiohttp-debuginfo - update to 3.9.3-150400.10.43.1
python311-aiohttp - update to 3.9.3-150400.10.43.1
python-aiohttp-debuginfo - update to 3.14.0-1
python3-aiohttp - update to 3.14.0-1
python-aiohttp-help - update to 3.14.0-1
python-aiohttp-debugsource - update to 3.14.0-1
python-aiohttp - update to 3.14.0-1
python-aiohttp - addressed in versions 3.14.3-3.fc45, 3.14.3-3.fc46

• https://github.com/aio-libs/aiohttp/security/advisories/GHSA-jg22-mg44-37j8
• https://github.com/aio-libs/aiohttp/commit/dcf40f30637e8752c76781cf6703b5a236749a00

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