CVE-2026-26220

LightLLM <= 1.1.0 PD Mode Unsafe Deserialization RCE

CVSS 9.3 CRITICALEPSS 0.7%CWE-502

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.3EPSS 0.7%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

17 Feb 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

ModelTC · LightLLM

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References

https://chocapikk.com/posts/2026/lightllm-pickle-rce/https://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L310 https://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L331 https://github.com/ModelTC/LightLLM/issues/1213 https://lightllm-en.readthedocs.io/en/latest/index.html https://www.vulncheck.com/advisories/lightllm-pd-mode-unsafe-deserialization-rce