---
cve: "CVE-2026-85734"
severity: "CRITICAL"
cvss: 9.1
epss: "0.6%"
vendor: "HKUDS"
kev: false
exploited: false
published: "2026-09-22 17:17:27"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-30T10:01:05+02:00"
---

# CVE-2026-85734

> 9.1 CRITICAL · 🧪 PoC

## Beschreibung

LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, the POST /login endpoint in lightrag/api/lightrag_server.py does not impose a rate limit, account lockout, delay, or counter for failed authentication attempts. A network attacker can submit password guesses at full request speed until a valid account password is found. Successful credential recovery grants authenticated access to documents, the knowledge graph, and administrative operations. This issue is fixed in version 1.5.5.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **total**

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- 135bc9056e9ecd800c1abe2f2ce24d1a86622a54 (Commit)
- 22ea2d0cbfa2b7002aa118bd0bf1780a69d489bc (Commit)

## Referenzen

- <https://github.com/HKUDS/LightRAG/security/advisories/GHSA-frch-4w6v-q5xx>
- <https://github.com/HKUDS/LightRAG/pull/3424>
- <https://github.com/HKUDS/LightRAG/commit/135bc9056e9ecd800c1abe2f2ce24d1a86622a54>
- <https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-85734) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_