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CVE-2026-85709— LightRAG: Sensitive Information Exposure Through Raw Exception Messages in API Error Responses

Quick assessment

Affected
HKUDS LightRAG
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, the LightRAG API server returns raw Python exception text from error handlers in document_routes.py, graph_routes.py, query_routes.py, ollama_api.py, and lightrag_server.py. The

CVSS 5.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
HKUDS LightRAG < 1.5.5 affected
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I. Basic Information for CVE-2026-85709

Vulnerability Information

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Vulnerability Title
LightRAG: Sensitive Information Exposure Through Raw Exception Messages in API Error Responses
Source: CVE Program / CVE List V5
Vulnerability Description
LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, the LightRAG API server returns raw Python exception text from error handlers in document_routes.py, graph_routes.py, query_routes.py, ollama_api.py, and lightrag_server.py. The detail=str(e), detail=str(exc), and equivalent formatted-message paths expose server filesystem paths, database host, port, user, and database names, language-model provider diagnostics, configuration details, and Python library internals to a network client that can trigger an error. The default unauthenticated configuration makes those responses reachable without credentials, and URI-configured backends can disclose connection strings containing credentials depending on the underlying driver error. This issue is fixed in version 1.5.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过错误消息导致的信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
HKUDS LightRAG < 1.5.5 -

II. Public POCs for CVE-2026-85709

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III. Intelligence Information for CVE-2026-85709

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Patches & Fixes for CVE-2026-85709 (2)

Other References for CVE-2026-85709 (2)

Same Patch Batch · HKUDS · 2026-09-22 · 5 CVEs total

CVE-2026-85734 9.1 CRITICAL LightRAG: No Rate Limiting on /login Endpoint Allows Brute-Force Attacks
CVE-2026-85740 7.1 HIGH LightRAG: SSRF via IPv6-transition address bypass (NAT64, IPv4-compatible, 6to4) of the na
CVE-2026-86062 6.1 MEDIUM LightRAG: Stored Cross-Site Scripting (XSS) in the LightRAG WebUI chat/answer renderer via
CVE-2026-85725 5.9 MEDIUM LightRAG: Plaintext Passwords Compared Without Constant-Time Function

IV. Related Vulnerabilities

Same product: LightRAG
Same vendor: HKUDS
Same weakness: CWE-209

V. Comments for CVE-2026-85709

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