CVE-2026-90919CWE-502insecure-deserialization

CVE-2026-90919

Critical · published September 14, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
65.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.01086 · 65.0th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2026-09-14T16:17Z
References (5)
https://github.com/ModelTC/LightLLM/blob/v1.2.0/lightllm/server/config_server/api_http.py#L79-L86 · [email protected]https://github.com/ModelTC/LightLLM/issues/1563 · [email protected]https://github.com/ModelTC/lightllm · [email protected]https://www.vulncheck.com/advisories/lightllm-through-1.2.0-unauthenticated-remote-code-execution-via-config-server-pickle-deserialization · [email protected]https://github.com/ModelTC/LightLLM/issues/1563 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 1%
    epss
  • 14 SEP 11:30Z
    LightLLM through 1.2.0 Unauthenticated Remote Code Execution via Config Server Pickle Deserialization
    cvelistv5