EUVD-2026-85294
GHSA-849v-g89f-q67r
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Once the nccl mode is enabled the RPyC channel is unauthenticated and network-reachable with trivial pickle exploitation (AV:N/AC:L/PR:N/UI:N), giving full RCE as the service account (C/I/A:H); the config gate affects likelihood, not base metrics.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
LightLLM through 1.2.0 contains a remote code execution vulnerability in the KV-transfer worker when started with --pd_trans_mode nccl, which exposes an unauthenticated RPyC control channel that deserializes attacker-supplied data. Attackers can send malicious pickled objects to the exposed RPyC ThreadedServer to execute arbitrary code with the privileges of the LightLLM service account.
Articles & Coverage 1
AnalysisAI
Remote code execution affects LightLLM deployments through version 1.2.0 that run the KV-transfer worker with the non-default '--pd_trans_mode nccl' option, which exposes an unauthenticated RPyC ThreadedServer control channel on the network. An attacker with network reachability can send a malicious pickled object to that channel, triggering unsafe deserialization and executing arbitrary code with the privileges of the LightLLM service account (CVSS 9.3; PR:N/UI:N). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the LightLLM KV-transfer worker be started with '--pd_trans_mode nccl' (the NCCL-based prefill/decode disaggregation transfer mode), which causes the worker to expose an unauthenticated RPyC ThreadedServer control channel. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue, not a high-CVSS paper tiger. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch version has been identified in the available data at time of analysis, so the most effective immediate action is to avoid the vulnerable configuration: do not start the LightLLM KV-transfer worker with '--pd_trans_mode nccl', or if NCCL-based prefill/decode disaggregation is required, restrict network access to the RPyC control port to trusted peers only (for example, bind it to a private interface and firewall it), accepting that this breaks the unauthenticated cross-node control channel the PD setup relies on and may require re-architecting the deployment. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all LightLLM 1.2.0 installations and identify which are running with the non-default '--pd_trans_mode nccl' option; for those systems, immediately restrict network access to the RPyC ThreadedServer control channel (e.g., via firewall rules) to only trusted hosts, or disable the NCCL-based prefill/decode disaggregation if operationally feasible. …
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External POC / Exploit Code
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