CVE-2026-111063 AIOHTTP: Secure attribute not enforced for shared cookie
Attackers can force secure cookies to be sent over unencrypted connections, exposing sensitive session data to interception.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-111063?
CVE-2026-111063 is a medium-severity vulnerability in aio-libs aiohttp, published on 19 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-111063?
2 open source packages ship an affected version, including aiohttp.
| Package | Affected | Fixed in |
|---|---|---|
aiohttp PyPI | All versions | 3.14.4 |
aiohttp PyPI | All versions | 3.14.4 |
How do I fix CVE-2026-111063?
Upgrade aiohttp to 3.14.4 or later.
Is CVE-2026-111063 being exploited?
There is no known exploitation of CVE-2026-111063 in the wild and no public exploit code.
Sources
Also known as AZL-109878, DEBIAN-CVE-2026-111063, ECHO-4123-2474-2218, GHSA-494j-54xm-rwp3, MINI-4rq8-273p-mvpf, MINI-f7j4-7rw4-8q6h and 2 more.