CVE-2026-103042

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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/ModelTC/LightLLM
https://github.com/ModelTC/LightLLM/issues/1595
https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode_backend/pd/base_kv_move_manager.py#L121-L122
https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode_backend/pd/nccl_kv_transporter.py#L416-L420
https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode_backend/pd/nccl_kv_transporter.py#L474-L485
https://www.vulncheck.com/advisories/lightllm-through-1.2.0-unauthenticated-memory-exhaustion-via-nccl-control-channel-set-value
https://github.com/ModelTC/LightLLM/issues/1595

Configurations

No configuration.

History

02 Oct 2026, 13:17

Type	Values Removed	Values Added
References	~~() https://github.com/ModelTC/LightLLM/issues/1595 -~~	() https://github.com/ModelTC/LightLLM/issues/1595 -

29 Sep 2026, 23:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-29 23:17

Updated : 2026-10-02 13:17

NVD link : CVE-2026-103042

Mitre link : CVE-2026-103042

CVE.ORG link : CVE-2026-103042

JSON object : View

Products Affected

No product.

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

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