CVE-2026-26220
LightLLM version 1.1.0 and prior contain an unauthenticated remote code execution vulnerability in PD (prefill-decode) disaggregation mode.
CVSS
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Sin CVSS
EPSS
0.7%
p48
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Exploit Today
14
0-100
Publicado: 17 feb 2026 · Última mod.: 14 jul 2026 · CWE-502
0.7%EPSS · 30 días0.7%
2026-06-302026-07-17
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.
- chocapikk.comhttps://chocapikk.com/posts/2026/lightllm-pickle-rce/
- github.comhttps://github.com/ModelTC/LightLLM/issues/1213
- github.comhttps://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L310
- github.comhttps://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L331
- lightllm-en.readthedocs.iohttps://lightllm-en.readthedocs.io/en/latest/index.html
- www.vulncheck.comhttps://www.vulncheck.com/advisories/lightllm-pd-mode-unsafe-deserialization-rce
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——29An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the `picklefile` parameter in the `yacc()` function. This parameter accepts a `.pkl` file that is deserialized with `pickle.load()` without validation. Because `pickle` allows execution of embedded code via `__reduce__()`, an attacker can achieve code execution by passing a malicious pickle file. The parameter is not mentioned in official documentation or the GitHub repository, yet it is active in the PyPI version. This introduces a stealthy backdoor and persistence risk. NOTE: A third-party states that this vulnerability should be rejected because the proof of concept does not demonstrate arbitrary code execution and fails to complete successfully.3d