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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

一分钟漏洞结论

影响对象
HKUDS LightRAG
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

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
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一、 漏洞 CVE-2026-85740 基础信息

漏洞信息

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Vulnerability Title
LightRAG: SSRF via IPv6-transition address bypass (NAT64, IPv4-compatible, 6to4) of the native-markdown image-download guard
来源: 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.
来源: 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
来源: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
HKUDS LightRAG < 1.5.5 -

二、漏洞 CVE-2026-85740 的公开POC

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三、漏洞 CVE-2026-85740 的情报信息

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CVE-2026-85740 其他参考 (6)

同批安全公告 · HKUDS · 2026-09-22 · 共 5 条

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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