by Kastro
Paper/Archive/CVE-2026-26220

CVE-2026-26220

ModelTC LightLLM — LightLLM <= 1.1.0 PD Mode Unsafe Deserialization RCE

EPSS 1.0%public exploitCVSS 9.3
critical.is priorityof 100
50
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 61.6.616 × 2012.3Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
LightLLM≤ 1.1.0–CNA

Scores by source

VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitchocapikk.com/posts/2026/lightllm-pickle-rcerefgithub.com/ModelTC/LightLLM/issues/1213reflightllm-en.readthedocs.io/en/latest/index.htmlrefgithub.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L310refgithub.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L331writeupvulncheck.com/advisories/lightllm-pd-mode-unsafe-deserialization-rce