CVE-2026-111063: AIOHTTP: Secure attribute not enforced for shared cookie

Severity: medium (CVSS 6.3 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-19 · updated 2026-10-22
Weakness: CWE-311

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, the Secure attribute for a shared cookie is not enforced. An attacker can consequently cause a shared cookie marked Secure to be sent with an unencrypted request. This issue is fixed in version 3.14.4.

Affected products

Pypi Aiohttp: before 3.14.4; 0.1, 0.10.0, 0.10.1, 0.10.2, 0.11.0, 0.12.0 (+304) — fixed in 3.14.4
aio-libs aiohttp: before 3.14.4

How to fix

Upgrade to a fixed version: Pypi Aiohttp 3.14.4. Check the vendor advisory for mitigations.

References

https://github.com/aio-libs/aiohttp/commit/999c356d61e966faffa97b06ab0d0455226d36c5
https://github.com/aio-libs/aiohttp/releases/tag/v3.14.4
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-494j-54xm-rwp3

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