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CVE-2026-26220

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Date: February 16, 2026

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.

Severity Score

Related Resources (8)

https://www.vulncheck.com/advisories/lightllm-pd-mode-unsafe-deserialization-rce
https://nvd.nist.gov/vuln/detail/CVE-2026-26220
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://chocapikk.com/posts/2026/lightllm-pickle-rce/
https://github.com/ModelTC/LightLLM/issues/1213
https://www.mend.io/vulnerability-database/CVE-2026-26220

Severity Score

Weakness Type (CWE)

Deserialization of Untrusted Data

CWE-502

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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