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CVE-2026-103042— LightLLM through 1.2.0 Unauthenticated Memory Exhaustion via NCCL Control Channel set_value

Quick assessment

Affected
ModelTC LightLLM
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LightLLM 1.2.0 及之前版本存在一个内存耗尽漏洞，该漏洞出现在 NCCL 控制通道中（在通过 --pd_trans_mode nccl 参数启动时）。未认证的攻击者可以利用此漏洞耗尽 KV 传输工作进程的内存。攻击者可通过调用 exposed_set_value 方法存储无大小限制的无界键值对，导致工作进程崩溃并引发节点故障。

CVSS 7.5 · High
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I. Basic Information for CVE-2026-103042

Vulnerability Information
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Vulnerability Title
LightLLM through 1.2.0 Unauthenticated Memory Exhaustion via NCCL Control Channel set_value
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ModelTC LightLLM 0 ~ 1.2.0 -

II. Public POCs for CVE-2026-103042

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III. Intelligence Information for CVE-2026-103042

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Other References for CVE-2026-103042 (1)

Other References for CVE-2026-103042 (5)

Same Patch Batch · ModelTC · 2026-09-29 · 3 CVEs total

CVE-2026-103041 9.8 CRITICAL LightLLM through 1.2.0 Unauthenticated Remote Code Execution via Embed Cache RPyC Service
CVE-2026-103040 9.8 CRITICAL LightLLM through 1.2.0 Unauthenticated Remote Code Execution via Router Profiler RPyC Serv

IV. Related Vulnerabilities

Same product: LightLLM
Same vendor: ModelTC
Same weakness: CWE-770

V. Comments for CVE-2026-103042

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