Deserialization in Modeltc Lightllm
CVE-2026-90919
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.
Vulnerability class: Insecure Deserialization
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
Weakness classification (CWE)
References
- disclosure@vulncheck.com (issue-tracking)
- disclosure@vulncheck.com (technical-description)
- disclosure@vulncheck.com (product)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-90919?
- CVE-2026-90919 is a critical-severity vulnerability in Modeltc Lightllm, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-09-14.
- How severe is CVE-2026-90919?
- Critical severity. CVSS v3 base score is 9.8 out of 10.