CVE-2026-103042: high-severity vulnerability in ModelTC LightLLM
LightLLM through 1.2.0 Unauthenticated Memory Exhaustion via NCCL Control Channel set_value
Published · Updated
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.5%
exploitation probability
0.5%top 58% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
ModelTC · LightLLMRelated CVEs — ModelTC LightLLM
In the same product, most dangerous first.
CVE-2026-26220CRITICALLightLLM <= 1.1.0 PD Mode Unsafe Deserialization RCEEPSS 1.7%CVE-2026-90919CRITICALLightLLM through 1.2.0 Unauthenticated Remote Code Execution via Config Server Pickle DeserializationEPSS 1.1%CVE-2026-103040CRITICALLightLLM through 1.2.0 Unauthenticated Remote Code Execution via Router Profiler RPyC ServiceEPSS 0.8%CVE-2026-93839CRITICALLightLLM through 1.2.0 Missing Authentication in PD Master /pd_register WebSocket EndpointEPSS 0.8%CVE-2026-96560CRITICALLightLLM through 1.2.0 Unauthenticated Remote Code Execution via NCCL PD RPyC Control ChannelEPSS 0.7%CVE-2026-103041CRITICALLightLLM through 1.2.0 Unauthenticated Remote Code Execution via Embed Cache RPyC ServiceEPSS 0.6%
References
https://github.com/ModelTC/LightLLMhttps://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode_backend/pd/base_kv_move_manager.py#L121-L122https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode_backend/pd/nccl_kv_transporter.py#L416-L420https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode_backend/pd/nccl_kv_transporter.py#L474-L485https://github.com/ModelTC/LightLLM/issues/1595https://www.vulncheck.com/advisories/lightllm-through-1.2.0-unauthenticated-memory-exhaustion-via-nccl-control-channel-set-value