Auth bypass in Modeltc Lightllm
CVE-2026-103270
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/ModelTC/LightLLM/issues/1609 (issue-tracking)
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http.py (technical-description)
- github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http_rl.py (technical-description)
- github.com/ModelTC/LightLLM (product)
- www.vulncheck.com/advisories/lightllm-through-1.2.0-missing-authentication-on-r… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-103270?
- CVE-2026-103270 is a high-severity vulnerability in Modeltc Lightllm, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-09-30.
- How severe is CVE-2026-103270?
- High severity. CVSS v3 base score is 7.5 out of 10.