What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-23
• Weakness: CWE-502

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

• ModelTC LightLLM: through 1.2.0

References

• https://github.com/ModelTC/LightLLM/blob/v1.2.0/lightllm/server/config_server/api_http.py#L79-L86
• https://github.com/ModelTC/LightLLM/issues/1563
• https://github.com/ModelTC/lightllm
• https://www.vulncheck.com/advisories/lightllm-through-1.2.0-unauthenticated-remote-code-execution-via-config-server-pickle-deserialization
• https://github.com/ModelTC/LightLLM/issues/1563

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