Deserialization of Untrusted Data in aiohttp - CVE-2026-34993
Published: June 2, 2026
Vulnerability identifier: #VU133242
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-34993
CWE-ID: CWE-502
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: aio-libs
Affected software:
aiohttp
aiohttp
Detailed vulnerability description
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.
How to mitigate CVE-2026-34993
Install security update from vendor's website.