CVE-2026-103042: ModelTC LightLLM · Unthrottled Resource Allocation
Affects ModelTC LightLLMSource CVE Database V5
Not known to be exploited · CVSS 8.7 High.
Data as of 12 Nov 2026, 23:24 UTC
- EPSS
- 0.6% chance of exploitation in 30 days – higher than 51% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 29 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| ModelTCLightLLM | Affected
| Fixed in– |
GitHubLightLLMpkg:github/LightLLMOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Until a fix is available, avoid running LightLLM with the --pd_trans_mode nccl option or restrict access to the exposed_set_value method to trusted users to prevent exploitation.
Description
LightLLM versions up to 1.2.0 have a memory exhaustion vulnerability in the NCCL control channel when started with the --pd_trans_mode nccl option. This flaw allows unauthenticated attackers to invoke the exposed_set_value method to store unlimited key-value pairs without size restrictions, leading to exhaustion of KV-transfer worker memory. The resulting memory exhaustion causes the worker process to crash and triggers node failure.
References
- github.com/ModelTC/LightLLM/issues/1595 (opens in a new tab)
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode_backend/pd/nccl_kv_transporter.py (opens in a new tab)
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode_backend/pd/nccl_kv_transporter.py (opens in a new tab)
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode_backend/pd/base_kv_move_manager.py (opens in a new tab)
- github.com/ModelTC/LightLLM (opens in a new tab)
- vulncheck.com/advisories/lightllm-through-1.2.0-unauthenticated-memory-exhaustion-via-nccl-control-channel-set-value (opens in a new tab)