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Vulnerability record · CVE-2026-26220 · published 17 February 2026

CVE-2026-26220: Deserialization of untrusted data vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 1.6% · top 24.8% CWE-502 · Deserialization of untrusted data Deferred
9.3CVSS 4.0 base score
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
14 Jul 2026Last modified by NVD

Description

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/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:

References

LinkTags
https://chocapikk.com/posts/2026/lightllm-pickle-rce/
https://github.com/ModelTC/LightLLM/issues/1213
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://lightllm-en.readthedocs.io/en/latest/index.html
https://www.vulncheck.com/advisories/lightllm-pd-mode-unsafe-deserialization-rce

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Source: NIST National Vulnerability Database (record CVE-2026-26220), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.