Deserialization in Modeltc Lightllm
CVE-2026-96560
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.012 (68.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.012 · change: +0.005
Affected products
Weakness classification (CWE)
References
- github.com/ModelTC/LightLLM/issues/1590 (issue-tracking)
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode… (technical-description)
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode… (technical-description)
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode… (technical-description)
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/router/model_infer/mode… (technical-description)
- github.com/ModelTC/lightllm (product)
- www.vulncheck.com/advisories/lightllm-through-1.2.0-unauthenticated-remote-code… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-96560?
- CVE-2026-96560 is a critical-severity vulnerability in Modeltc Lightllm, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-09-23.
- How severe is CVE-2026-96560?
- Critical severity. CVSS v3 base score is 9.8 out of 10.