CVE-2026-85740

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 73% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity71% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

September 22, 2026

Last Modified

September 22, 2026

Advisory Details (6)

Auto-updated Sep 22, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

v1.5.5

Patch available: HKUDS/LightRAG v1.5.5

https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5
github_commit Patch Available

commit c598545aa008 (HKUDS/LightRAG)

Patch available: HKUDS/LightRAG v1.5.5 (contains commit c598545aa008)

https://github.com/HKUDS/LightRAG/commit/c598545aa0084a427bcb19a84ade5e0ec31fa673
github_commit Patch Available

commit a25862177a9b (HKUDS/LightRAG)

Patch available: HKUDS/LightRAG v1.5.5 (contains commit a25862177a9b)

https://github.com/HKUDS/LightRAG/commit/a25862177a9b00e0edb870778a42b4155924de09
github_commit Patch Available

commit 9207e7fd10cf (HKUDS/LightRAG)

Patch available: HKUDS/LightRAG v1.5.5 (contains commit 9207e7fd10cf)

https://github.com/HKUDS/LightRAG/commit/9207e7fd10cf6df3cf26e3dd1921490b34a2f132
github_pr Patch Available

fix(parser): block IPv6-transition SSRF bypass of native-md image guard

Patch available: HKUDS/LightRAG v1.5.5 (PR #3426 merged 2026-07-18)

https://github.com/HKUDS/LightRAG/pull/3426
github Patch Available🟡 PoC Available

SSRF via IPv6-transition address bypass (NAT64, IPv4-compatible, 6to4) of the native-markdown image-download guard · Advisory · HKUDS/LightRAG · GitHub

https://github.com/HKUDS/LightRAG/security/advisories/GHSA-vv3m-f8x4-7377

Vendor Advisories for CVE-2026-85740(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 5× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-24 02:17 UTCEG score recompute
  2. 2026-09-23 17:54 UTCEPSS rescore
  3. 2026-09-22 17:36 UTCEG score recompute
  4. 2026-09-22 16:25 UTCEG score recompute
  5. 2026-09-22 16:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-85740?
CVE-2026-85740 is a high vulnerability published on September 22, 2026. LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, validatedaddresses in lightrag/parser/markdown/parser.py evaluates the literal resolved address with ipaddress.isglobal without consistently classifying an IPv4 address embedded in an IPv6 transition wrapper. A caller…
When was CVE-2026-85740 disclosed?
CVE-2026-85740 was first published in the National Vulnerability Database on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-85740 actively exploited?
CVE-2026-85740 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 72.9% of all scored CVEs.
What is the CVSS score of CVE-2026-85740?
CVE-2026-85740 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-85740?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-85740, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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