CVE-2026-103042 LightLLM through 1.2.0 Unauthenticated Memory Exhaustion via NCCL Control Channel set_value
Unauthenticated attackers can exhaust memory in LightLLM via NCCL control channel, causing worker crashes and node failure.
- 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-2026-103042?
CVE-2026-103042 is a high-severity denial of service 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 memory exhaustion vulnerability in the NCCL control channel when started with --pd_trans_mode nccl, allowing unauthenticated attackers to exhaust KV-transfer worker memory. Attackers can call the exposed_set_value method to store unbounded key-value pairs without size limits, causing the worker process to crash and triggering node failure.
Weakness: CWE-770
Which versions are affected by CVE-2026-103042?
How do I fix CVE-2026-103042?
No fix has been published for CVE-2026-103042 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-103042 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-103042 exists.
Sources
Also known as GHSA-mqxw-j6vh-r94f.