Vulnerability · Published Sep 14, 2026 · Assigned by VulnCheck

CVE-2026-90919LightLLM through 1.2.0 Unauthenticated Remote Code Execution via Config Server Pickle Deserialization

Critical 9.8

In plain English

A critical-severity unsafe deserialization in LightLLM from ModelTC. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 65% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)1.1%top 34.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
ModelTC	LightLLM	0 – through 1.2.0

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

GitHub Issue #1563 issue-tracking
visual_websocket_endpoint pickle.loads sink at v1.2.0 technical-description
https://github.com/ModelTC/lightllm product
VulnCheck Advisory: LightLLM through 1.2.0 Unauthenticated Remote Code Execution via Config Server Pickle Deserialization third-party-advisory