Deserialization in Modeltc Lightllm
CVE-2026-26220
LightLLM version 1.1.0 and prior contain an unauthenticated remote code execution vulnerability in PD (prefill-decode) disaggregation mode. The PD master node exposes WebSocket endpoints that receive binary frames and pass the data directly to pickle.loads() without authentication or validation. A remote attacker who can reach the PD master can send a crafted payload to achieve arbitrary code execution.
Vulnerability class: Insecure Deserialization
Published · last modified .
EPSS exploit prediction
EPSS: 0.016 (75.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.3% 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: 0.016 · change: +0.010
Affected products
- Modeltc Lightllm — versions 0
Weakness classification (CWE)
References
- chocapikk.com/posts/2026/lightllm-pickle-rce/ (technical-description, exploit)
- github.com/ModelTC/LightLLM/issues/1213 (issue-tracking, patch)
- lightllm-en.readthedocs.io/en/latest/index.html (product)
- github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/light… (product)
- github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/light… (product)
- www.vulncheck.com/advisories/lightllm-pd-mode-unsafe-deserialization-rce (third-party-advisory)