CVE-2026-103270 Details
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.
A vulnerability exists in LightLLM versions through 1.2.0, where reinforcement learning (RL) control routes are mounted on the public HTTP API without authentication. This allows unauthenticated attackers to disrupt inference operations by calling endpoints such as /pause_generation, /abort_request, /flush_cache, and /init_weights_update_group. The issue is particularly problematic in deployments that have been started with the --enable_rl flag, as it can wedge inference workers by forcing them into an NCCL process group controlled by the attacker.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 30, 2026CISA-ADP
Assessed Sep 30, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/ModelTC/LightLLM/issues/1609 | CISA-ADP | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/ModelTC/LightLLM | [email protected] | Vendor |
| https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http.py#L505-L507 | [email protected] | Source CodeVendor |
| https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http_rl.py#L51-L139 | [email protected] | Source CodeVendor |
| https://github.com/ModelTC/LightLLM/issues/1609 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://www.vulncheck.com/advisories/lightllm-through-1.2.0-missing-authentication-on-rl-control-routes | [email protected] | AdvisoryBundleRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-306 | Missing Authentication for Critical Function | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| ModelTC LightLLM | <= 1.2.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 30, 2026 | CVE Modified | CISA-ADP |
| Sep 30, 2026 | New CVE Received | [email protected] |