CVE-2026-103040 LightLLM through 1.2.0 Unauthenticated Remote Code Execution via Router Profiler RPyC Service
Attackers can execute arbitrary code on LightLLM servers if the profiling feature is enabled, due to unsafe pickle deserialization in the RPyC service.
- 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-2026-103040?
CVE-2026-103040 is a critical unsafe deserialization vulnerability in ModelTC LightLLM, published on 29 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 router profiler service when started with --enable_profiling flag. The service exposes an unauthenticated RPyC server with pickle deserialization enabled, allowing attackers to execute arbitrary code by sending crafted serialized objects to the profiler command queue.
Weakness: CWE-502
Which versions are affected by CVE-2026-103040?
How do I fix CVE-2026-103040?
No fix has been published for CVE-2026-103040 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-2026-103040 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-103040 exists.
Sources
Also known as GHSA-c838-68vr-jxfw.