CVE-2026-90919
LightLLM through 1.2.0 Unauthenticated Remote Code Execution via Config Server Pickle Deserialization
- State
- Published
- Severity
- 9.3 Critical
- Published
- Sep 14, 2026
- Updated
- Sep 14, 2026
- Reserved
- Sep 14, 2026
Description
LightLLM through 1.2.0 contains a remote code execution vulnerability in the Config Server's unauthenticated /visual_register WebSocket endpoint that passes the first client frame directly to pickle.loads(). Attackers can reach the Config Server port and send a malicious serialized payload with a __reduce__ method to execute arbitrary code with Config Server process privileges.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-502 Deserialization of Untrusted Data
Affected Products
| Product | Versions |
|---|---|
LightLLMModelTC |
|
References
- GitHub Issue #1563issue-tracking
- visual_websocket_endpoint pickle.loads sink at v1.2.0technical-description
- https://github.com/ModelTC/lightllmproduct
- VulnCheck Advisory: LightLLM through 1.2.0 Unauthenticated Remote Code Execution via Config Server Pickle Deserializationthird-party-advisory
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