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.

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

Published 2026-09-14 · last modified 2026-09-23.

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.

EPSS exploit prediction

EPSS: 0.011 (65.2th percentile), scored 2026-10-30.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Modeltc Lightllm

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

github.com/ModelTC/LightLLM/issues/1563 (issue-tracking)
github.com/ModelTC/LightLLM/blob/v1.2.0/lightllm/server/config_server/api_http… (technical-description)
github.com/ModelTC/lightllm (product)
www.vulncheck.com/advisories/lightllm-through-1.2.0-unauthenticated-remote-code… (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.