---
id: CVE-2026-85734
title: LightRAG provides simple and fast retrieval-augmented generation
summary: >-
  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 atte…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-307
vendor: HKUDS
product: LightRAG
affected:
  - LightRAG < 1.5.5
published: '2026-09-22'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T18:17:23.530'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85734'
references:
  - url: >-
      https://github.com/HKUDS/LightRAG/commit/135bc9056e9ecd800c1abe2f2ce24d1a86622a54
    label: security-advisories@github.com
  - url: 'https://github.com/HKUDS/LightRAG/pull/3424'
    label: security-advisories@github.com
  - url: 'https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5'
    label: security-advisories@github.com
  - url: 'https://github.com/HKUDS/LightRAG/security/advisories/GHSA-frch-4w6v-q5xx'
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85734'
  - url: 'https://github.com/advisories/GHSA-frch-4w6v-q5xx'
  - url: 'https://github.com/HKUDS/LightRAG'
tags:
  - nvd
  - cve.org
  - ghsa
  - pip
  - osv
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-22T17:36:54.076707Z'
ingestedAt: '2026-09-22T17:07:07.383Z'
aliases:
  - GHSA-frch-4w6v-q5xx
ecosystem: pip
patched:
  - lightrag-hku 1.5.5
epss: 0.00355
epssPercentile: 0.26611
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-85734)

Affected packages:

- `lightrag-hku < 1.5.5`

Patched in:

- `lightrag-hku 1.5.5`

Source: https://github.com/advisories/GHSA-frch-4w6v-q5xx