CVE-2026-26220
LightLLM <= 1.1.0 PD Mode Unsafe Deserialization RCE
- State
- Published
- Severity
- 9.3 Critical
- Published
- Feb 17, 2026
- Updated
- Jul 14, 2026
- Reserved
- Feb 11, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | 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 | VulnCheck |
Weaknesses
- CWE-502 Deserialization of Untrusted Data
Affected Products
| Product | Versions |
|---|---|
LightLLMModelTC |
|
References
- https://chocapikk.com/posts/2026/lightllm-pickle-rce/technical-descriptionexploit
- https://github.com/ModelTC/LightLLM/issues/1213issue-tracking
- https://lightllm-en.readthedocs.io/en/latest/index.htmlproduct
- https://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L310product
- https://github.com/ModelTC/lightllm/blob/a27dfc88c2144ed51a6e160b6fbe20aad66c8fe0/lightllm/server/api_http.py#L331product
- https://www.vulncheck.com/advisories/lightllm-pd-mode-unsafe-deserialization-rcethird-party-advisory
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