CVE-2026-90919 LightLLM through 1.2.0 Unauthenticated Remote Code Execution via Config Server Pickle Deserialization
Unauthenticated attackers can execute arbitrary code on LightLLM Config Servers by sending malicious pickle payloads to the visual_register WebSocket endpoint.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-90919?
CVE-2026-90919 is a critical unsafe deserialization vulnerability in ModelTC LightLLM, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-502
Which versions are affected by CVE-2026-90919?
How do I fix CVE-2026-90919?
No fix has been published for CVE-2026-90919 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-90919 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90919 exists.
Sources
Also known as GHSA-6qph-w2vp-jm84.