medium4.3
CVE-2026-42276
Onyx is an open-source AI platform.
Impact
Onyx is an open-source AI platform. Prior to versions 3.0.9, 3.1.6, and 3.2.6, the POST /chat/stop-chat-session/{chat_session_id} endpoint lets any authenticated user stop any other user's active chat session. The endpoint checks authentication but never verifies the session belongs to the caller. An attacker who knows a chat session UUID can kill another user's LLM generation mid-stream. This issue has been patched in versions 3.0.9, 3.1.6, and 3.2.6.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Onyx | Onyx | before 3.0.9 from 3.1.0 before 3.1.6 from 3.2.0 before 3.2.6 |