CVE-2026-90919 Details
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.
A remote code execution vulnerability exists in LightLLM versions through 1.2.0, specifically within the Config Server's unauthenticated '/visual_register' WebSocket endpoint. This vulnerability arises because the endpoint directly deserializes client-provided data using 'pickle.loads()' without any authentication checks. Attackers can exploit this by sending a malicious serialized payload that includes a '__reduce__' method, allowing arbitrary code execution with the privileges of the Config Server process.
Users are advised to update to the patched version of LightLLM, where this vulnerability has been addressed. For those using the affected version, it is recommended to disable the WebSocket registration endpoint or implement authentication and validation measures before deserializing data.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 14, 2026CISA-ADP
Assessed Sep 14, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/ModelTC/LightLLM/issues/1563 | CISA-ADP | ExploitIssue TrackingTechnical AnalysisVendor |
| https://github.com/ModelTC/lightllm | [email protected] | Vendor |
| https://github.com/ModelTC/LightLLM/blob/v1.2.0/lightllm/server/config_server/api_http.py#L79-L86 | [email protected] | Source CodeVendor |
| https://github.com/ModelTC/LightLLM/issues/1563 | [email protected] | ExploitIssue TrackingTechnical AnalysisVendor |
| https://www.vulncheck.com/advisories/lightllm-through-1.2.0-unauthenticated-remote-code-execution-via-config-server-pickle-deserialization | [email protected] | AdvisoryBundleRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-502 | Deserialization of Untrusted Data | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| ModelTC LightLLM | <= 1.2.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 14, 2026 | CVE Modified | CISA-ADP |
| Sep 14, 2026 | New CVE Received | [email protected] |