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CVE-2026-85740— LightRAG: SSRF via IPv6-transition address bypass (NAT64, IPv4-compatible, 6to4) of the native-markdown image-download guard

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, _validated_addresses in lightrag/parser/markdown/parser.py evaluates the literal resolved address with ipaddress.is_global without consistently classifying an IPv4 address embedd

CVSS 7.1 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
HKUDS LightRAG < 1.5.5 affected
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I. Basic Information for CVE-2026-85740

Vulnerability Information

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Vulnerability Title
LightRAG: SSRF via IPv6-transition address bypass (NAT64, IPv4-compatible, 6to4) of the native-markdown image-download guard
Source: CVE Program / CVE List V5
Vulnerability Description
LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, _validated_addresses in lightrag/parser/markdown/parser.py evaluates the literal resolved address with ipaddress.is_global without consistently classifying an IPv4 address embedded in an IPv6 transition wrapper. A caller who can upload a Markdown or textpack document can supply an external image URL using NAT64 64:ff9b::/96 or an IPv4-compatible form that embeds a loopback, private, or cloud-metadata IPv4 address. On a deployment with compatible NAT64 or DNS64 routing, _download and _build_guarded_opener accept the wrapper and fetch the internal resource, whose body is then ingested. Current interpreter behavior already blocks some RFC 8215 and 6to4 forms, but the fixed guard handles all documented wrappers without becoming more permissive than the standard library. This issue is fixed in version 1.5.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
HKUDS LightRAG < 1.5.5 -

II. Public POCs for CVE-2026-85740

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III. Intelligence Information for CVE-2026-85740

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Patches & Fixes for CVE-2026-85740 (4)

Other References for CVE-2026-85740 (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-2026-86062 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
CVE-2026-85709 5.3 MEDIUM LightRAG: Sensitive Information Exposure Through Raw Exception Messages in API Error Respo

IV. Related Vulnerabilities

Same product: LightRAG
Same vendor: HKUDS
Same weakness: CWE-918

V. Comments for CVE-2026-85740

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