CVE-2026-85740

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.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: HIGH
CVSS score: 7.1 / 10
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
Effective score: 7.1 / 10 HIGH source: CNA overview
CWE(s): CWE-918
Reserved: 2026-09-04
Published: 2026-09-22 16:20 UTC
Last updated: 2026-09-22 16:20 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/85xxx/CVE-2026-85740.json
Linked Threat: CVE-2026-85740 — LightRAG: SSRF via IPv6-transition address bypass (NAT64, IPv4-compatible, 6to4) of the native-markdown image-download guard

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-22 17:17:27 UTC
NVD last modified: 2026-09-22 17:17:27 UTC
NVD CVSS v3.1: 7.1 / 10 HIGH source: security-advisories@github.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
Exploitability subscore: 1.8 / 10
Impact subscore: 4.7 / 10

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-84549
Assigner: GitHub_M
Published: Sep 22, 2026, 4:20:11 PM
Updated: Sep 22, 2026, 4:20:11 PM
EUVD base score (CVSS 3.1): 7.1 / 10
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
EUVD-reported EPSS: 0.0000
Vendors: HKUDS
Products: LightRAG (< 1.5.5)
Aliases: GHSA-vv3m-f8x4-7377

ENISA 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.

EUVD references (6)

Affected products (1)

Vendor	Product	Versions	Platforms
HKUDS	LightRAG	`< 1.5.5` (affected)	—

Vendor references (6)

References embedded in the original CVE record by the assigning CNA.

https://github.com/HKUDS/LightRAG/security/advisories/GHSA-vv3m-f8x4-7377 x_refsource_CONFIRM
https://github.com/HKUDS/LightRAG/pull/3426 x_refsource_MISC
https://github.com/HKUDS/LightRAG/commit/9207e7fd10cf6df3cf26e3dd1921490b34a2f132 x_refsource_MISC
https://github.com/HKUDS/LightRAG/commit/a25862177a9b00e0edb870778a42b4155924de09 x_refsource_MISC
https://github.com/HKUDS/LightRAG/commit/c598545aa0084a427bcb19a84ade5e0ec31fa673 x_refsource_MISC
https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5 x_refsource_MISC

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (6)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/HKUDS/LightRAG/commit/9207e7fd10cf6df3cf26e3dd1921490b34a2f132 security-advisories@github.com
https://github.com/HKUDS/LightRAG/commit/a25862177a9b00e0edb870778a42b4155924de09 security-advisories@github.com
https://github.com/HKUDS/LightRAG/commit/c598545aa0084a427bcb19a84ade5e0ec31fa673 security-advisories@github.com
https://github.com/HKUDS/LightRAG/pull/3426 security-advisories@github.com
https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5 security-advisories@github.com
https://github.com/HKUDS/LightRAG/security/advisories/GHSA-vv3m-f8x4-7377 security-advisories@github.com

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CVE-2026-69414 ShieldBreak Zero-Day: No Patch, and CISA BOD 26-04 Gives ...

web:blog.qualys.com

Executive Summary ShieldBreak ( CVE - 2026 -69414) is a zero-day elevation-of-privilege vulnerability in the Microsoft Malware Protection Engine used by Microsoft Defender, allowing a low-privilege local attacker to escalate to SYSTEM. A public PoC was released on August 12, 2026 , and Microsoft assigned the CVE on August 14, and no patch is available yet. Qualys VMDR provides detection across ...

2026-09-23 15:14 UTC
Pennsylvania Access To Criminal History - Home - pa

web:epatch.pa.gov

Why does PATCH exist? Its purpose is to better enable the public to obtain criminal history record checks. The repository was created and is maintained in accordance with Pennsylvania's Criminal History Information Act contained in Chapter 91 of Title 18, Crimes Code. This Act also directs the Pennsylvania State Police (PSP) to disseminate criminal history data to criminal justice agencies ...

2026-09-23 15:14 UTC
SkyBlock Patch Notes | Hypixel Forums

web:hypixel.net

All SkyBlock Patch Notes can be found here! You can click the Watch button in this section to be alerted when new Patch Notes are released!

2026-09-23 15:14 UTC
Security Update Guide - Microsoft Security Response Center

web:msrc.microsoft.com

Security Update Guide - Microsoft Security Response Center

2026-09-23 15:14 UTC
VALORANT Patch Notes 13.06

web:playvalorant.com

GENERAL UPDATES With Patch 13.06, VALORANT Console is now available in Australia and New Zealand! G'day and kia ora, gamers! KNOWN ISSUES Competitive Console issue for mode selection when in Range in Queue Modes When exiting the queue, you may be unable to enter the Range for a moment even while not in any queue. This will be fixed in a ...

2026-09-23 15:14 UTC
August 11, 2026—Hotpatch KB5120994 (OS Builds 26200.9106 and 26100.9106 ...

web:support.microsoft.com

This Hotpatch update for Windows 11, version 25H2 and 24H2 (KB5120994) includes security improvements. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information on Windows update terminology, see the different types of Windows software updates. To ...

2026-09-23 15:14 UTC
Home - The Patch Augusta Municipal Golf Course

web:www.golfthepatch.com

Now open, The Patch features a redesigned 18-hole course, led by golf course architects Tom Fazio and Beau Welling, and a new 9-hole short course, The Loop at The Patch , designed by Tiger Woods and TGR Design. Welcome to Augusta's best-in-class public golf experience.

2026-09-23 15:14 UTC
RDS Bug September 2026: Fix Windows Server Now

web:www.it-connect.tech

Fix the September 2026 RDS bug on Windows Server with Microsoft's KIR rollback. Learn deployment steps and keep the security update installed.

2026-09-23 15:14 UTC
Critical Patch Updates, Critical Security Patch Updates ... - Oracle

web:www.oracle.com

Critical Security Patch Updates Critical Security Patch Updates provide security patches for supported Oracle on-premises products. A Critical Security Patch Update provides targeted, high-priority security fixes in a smaller, more focused format, making them easier to apply with minimal disruption.

2026-09-23 15:14 UTC
Oracle

web:www.oracle.com

Oracle Critical Security Patch Update Advisory - August 2026 Description. A Critical Security Patch Update (CSPU) provides targeted, high-priority security fixes in a smaller, mor

2026-09-23 15:14 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-85740.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "LightRAG",
          "vendor": "HKUDS",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.5.5"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-918",
              "description": "CWE-918: Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-22T16:20:11.620Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/HKUDS/LightRAG/security/advisories/GHSA-vv3m-f8x4-7377",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/HKUDS/LightRAG/security/advisories/GHSA-vv3m-f8x4-7377"
        },
        {
          "name": "https://github.com/HKUDS/LightRAG/pull/3426",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/HKUDS/LightRAG/pull/3426"
        },
        {
          "name": "https://github.com/HKUDS/LightRAG/commit/9207e7fd10cf6df3cf26e3dd1921490b34a2f132",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/HKUDS/LightRAG/commit/9207e7fd10cf6df3cf26e3dd1921490b34a2f132"
        },
        {
          "name": "https://github.com/HKUDS/LightRAG/commit/a25862177a9b00e0edb870778a42b4155924de09",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/HKUDS/LightRAG/commit/a25862177a9b00e0edb870778a42b4155924de09"
        },
        {
          "name": "https://github.com/HKUDS/LightRAG/commit/c598545aa0084a427bcb19a84ade5e0ec31fa673",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/HKUDS/LightRAG/commit/c598545aa0084a427bcb19a84ade5e0ec31fa673"
        },
        {
          "name": "https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5"
        }
      ],
      "source": {
        "advisory": "GHSA-vv3m-f8x4-7377",
        "discovery": "UNKNOWN"
      },
      "title": "LightRAG: SSRF via IPv6-transition address bypass (NAT64, IPv4-compatible, 6to4) of the native-markdown image-download guard"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-85740",
    "datePublished": "2026-09-22T16:20:11.620Z",
    "dateReserved": "2026-09-04T14:50:16.719Z",
    "dateUpdated": "2026-09-22T16:20:11.620Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}