LightLLM through 1.2.0 Missing Authentication on RL Control Routes

Advisories

LightLLM through 1.2.0 Missing Authentication on RL Control Routes

severity: high
date: 9/30/2026
Affecting: LightLLM <= 1.2.0
CVE: CVE-2026-103270
CWE: CWE-306 Missing Authentication for Critical Function
CVSS: 8.7
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References: GitHub Issue #1609
https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http.py#L505-L507
https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http_rl.py#L51-L139
https://github.com/ModelTC/LightLLM
Credit: Mingkai Yu, Jiajia Liu
Description: LightLLM through 1.2.0 mounts reinforcement learning control routes on the public HTTP API without authentication checks. Unauthenticated attackers can call endpoints like /pause_generation, /abort_request, /flush_cache, and /init_weights_update_group to disrupt inference operations and wedge workers on deployments started with --enable_rl.

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