CVE-2026-93839

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-18. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

Published

September 18, 2026

Last Modified

September 18, 2026

Advisory Details (7)

Auto-updated Sep 18, 2026
No patch confirmed yet.
generic

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

https://www.vulncheck.com/advisories/lightllm-through-1.2.0-missing-authentication-in-pd-master-pd-register-websocket-endpoint
generic

LightLLM/lightllm/server/httpserver_for_pd_master/manager.py at v1.2.0 · ModelTC/LightLLM · GitHub

https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/httpserver_for_pd_master/manager.py#L714-L749
generic

LightLLM/lightllm/server/httpserver_for_pd_master/manager.py at v1.2.0 · ModelTC/LightLLM · GitHub

https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/httpserver_for_pd_master/manager.py#L691-L698
generic

LightLLM/lightllm/server/api_http_pd.py at v1.2.0 · ModelTC/LightLLM · GitHub

https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http_pd.py#L26-L36
generic

LightLLM/lightllm/server/api_http.py at v1.2.0 · ModelTC/LightLLM · GitHub

https://github.com/ModelTC/lightllm/blob/v1.2.0/lightllm/server/api_http.py#L198-L205
generic

[BUG]Missing authentication in /pd_register allows attackers to hijack requests and disclose user prompts · Issue #1576 · ModelTC/LightLLM · GitHub

https://github.com/ModelTC/LightLLM/issues/1576
generic

GitHub - ModelTC/LightLLM: LightLLM is a Python-based LLM (Large Language Model) inference and serving framework, notable for its lightweight design, easy scalability, and high-speed performance. · GitHub

https://github.com/ModelTC/LightLLM

Vendor Advisories for CVE-2026-93839(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 7× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 07:46 UTCGHSA enrichment
  2. 2026-09-19 04:02 UTCGHSA enrichment
  3. 2026-09-19 00:16 UTCEG score recompute
  4. 2026-09-19 00:15 UTCGHSA enrichment
  5. 2026-09-18 20:31 UTCEG score recompute
  6. 2026-09-18 19:19 UTCEG score recompute
  7. 2026-09-18 19:19 UTCMITRE cvelistV5first tracked

Frequently asked(4)

What is CVE-2026-93839?
CVE-2026-93839 is a critical vulnerability published on September 18, 2026. 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,…
When was CVE-2026-93839 disclosed?
CVE-2026-93839 was first published in the National Vulnerability Database on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-93839?
CVE-2026-93839 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-93839?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-93839, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-93839

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