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CVE-2026-93839

LightLLM through 1.2.0 Missing Authentication in PD Master /pd_register WebSocket Endpoint

CVSS 4.0 9.3 CRITICALCVSS 3.1 9.8 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-93839

Published

LightLLM through 1.2.0 contains an authentication bypass vulnerability in the /pd_register WebSocket endpoint that allows unauthenticated attackers to register arbitrary nodes by supplying crafted JSON without peer address validation. Attackers can disclose full user prompts routed to their socket, trigger denial of service by replacing legitimate nodes, or make the PD Master issue requests to internal network addresses.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-93839

Published

LightLLM

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "ModelTC",
                    "product": "LightLLM",
                    "packageName": "LightLLM",
                    "packageURL": "pkg:github/ModelTC/lightllm",
                    "repo": "https://github.com/ModelTC/lightllm",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThanOrEqual": "1.2.0"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON