Missing Release of Resource after Effective Lifetime in aiohttp - #VU153858
Published: October 7, 2026
Vulnerability identifier: #VU153858
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-772
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to keep idle connections open indefinitely.
The vulnerability exists due to a missing initial request/header timeout in the aiohttp server when waiting for initial request data. A remote attacker can open a connection without sending any data to keep idle connections open indefinitely.
Affected software
aiohttp
Remediation
Install security update from vendor's website.
aiohttp - update to 3.14.4