Missing Encryption of Sensitive Data in aiohttp - #VU153857
Published: October 7, 2026
Vulnerability identifier: #VU153857
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-311
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive cookie data.
The vulnerability exists due to missing enforcement of the Secure attribute in aiohttp shared-cookie handling when sending unencrypted requests. A remote attacker can send a shared cookie marked Secure in an unencrypted request to disclose sensitive cookie data.
Affected software
aiohttp
Remediation
Install security update from vendor's website.
aiohttp - update to 3.14.4