CVE-2026-105792: CWE-833: Deadlock in microsoft UFO
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.
CVSS v3.1
Score 6.5medium
Affected software
microsoft
UFO
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Microsoft UFO versions before 3.0.9 contain a deadlock vulnerability (CWE-833) in the /api/task_result/{task_name} endpoint. The endpoint calls SessionManager.get_result_by_task(), which acquires a non-reentrant lock and then calls SessionManager.get_result() that attempts to acquire the same lock again if the task name maps to a session. This causes the thread to block indefinitely, preventing further processing in the single-process server event loop. Unknown task names do not trigger the nested lock acquisition and are unaffected. The vulnerability is resolved in version 3.0.9.
Potential Impact
An authenticated attacker who knows or creates a mapped task name can cause a deadlock that blocks the event-loop thread in the default single-process server configuration. This results in denial of service by preventing HTTP, WebSocket, and background interactions from proceeding. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
Upgrade Microsoft UFO to version 3.0.9 or later, where this deadlock issue is fixed. No other mitigation is indicated or required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-10-05T20:37:19.364Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac506e32cdf04f656b9a05c
Added to database: 10/06/2026, 14:34:11 UTC
Last enriched: 10/06/2026, 14:48:57 UTC
Last updated: 10/06/2026, 18:57:27 UTC
Views: 12
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