CVE-2026-105792 Microsoft UFO: Authenticated task-result request can deadlock UFO server session manager
An authenticated attacker can deadlock the Microsoft UFO server session manager by triggering a nested lock acquisition, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-105792?
CVE-2026-105792 is a medium-severity denial of service vulnerability in microsoft UFO, published on 6 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Microsoft UFO is an open-source framework for intelligent automation across devices and platforms. Prior to 3.0.9, the /api/task_result/{task_name} endpoint calls SessionManager.get_result_by_task() in ufo/server/services/session_manager.py, which acquires a non-reentrant lock and then calls SessionManager.get_result() to acquire the same lock again when the task name maps to a session. An authenticated caller who knows or creates a mapped task name can therefore block the request indefinitely, and in the default single-process server configuration the blocked event-loop thread prevents other HTTP, WebSocket, and dependent background interactions. Unknown task names do not reach the nested call and are not affected. This issue is fixed in version 3.0.9.
Weakness: CWE-833
Which versions are affected by CVE-2026-105792?
How do I fix CVE-2026-105792?
No fix has been published for CVE-2026-105792 yet. Limit exposure of the affected software until one is available.
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-2026-105792 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-105792 exists.
Sources
Also known as GHSA-3hwr-qx8m-9xxx.