CVE-2026-90919
Critical
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductLightLLM
PublishedSep 14, 2026
First seenSep 14, 2026
Weakness typeCWE-502Deserialization of untrusted data
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ModelTC LightLLM | v ≤ 1.2.0 | — |
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