CVE-2026-111065 AIOHTTP: Connector pool exhaustion via Max-Age overflow
An attacker can exhaust the connection pool in AIOHTTP by exploiting a Max-Age overflow, causing temporary denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-111065?
CVE-2026-111065 is a medium-severity denial of service 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, Max-Age processing can overflow and skip closing a connection. An attacker can consequently exhaust the connection pool temporarily until garbage collection resolves the connections. This issue is fixed in version 3.14.4.
Weakness: CWE-770
Which versions are affected by CVE-2026-111065?
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-2026-111065?
Upgrade aiohttp to 3.14.4 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-111065 being exploited?
There is no known exploitation of CVE-2026-111065 in the wild and no public exploit code.
Sources
Also known as AZL-109884, DEBIAN-CVE-2026-111065, ECHO-fcd4-2a31-4d77, GHSA-6cjc-53gc-5rqm, MINI-2cxh-gx9r-rgpv, MINI-367g-mgjv-5fj2 and 2 more.