Server-side request forgery in HKUDS LightRAG
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| HKUDS | LightRAG | before 1.5.5 | 1.5.5 | Patch available | CNA |
| — | lightrag-hku (PyPI) | before 1.5.5 | 1.5.5 | Patch available | GHSA-vv3m-f8x4-7377 |
- LightRAG VendorHKUDS Affected before 1.5.5 Fixed in 1.5.5 Patch available CNA
- lightrag-hku (PyPI) Vendor— Affected before 1.5.5 Fixed in 1.5.5 Patch available GHSA-vv3m-f8x4-7377
Remediation
- Fix · CNA LightRAG (HKUDS) Fixed in 1.5.5
- Fix · GHSA-vv3m-f8x4-7377 lightrag-hku (PyPI) Fixed in 1.5.5 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-85740
- 2026-10-03 Alias added: GHSA-vv3m-f8x4-7377
References
Other 7
- https://github.com/HKUDS/LightRAG/security/advisories/GHSA-vv3m-f8x4-7377
- https://github.com/HKUDS/LightRAG/pull/3426
- https://github.com/HKUDS/LightRAG/commit/9207e7fd10cf6df3cf26e3dd1921490b34a2f132
- https://github.com/HKUDS/LightRAG/commit/a25862177a9b00e0edb870778a42b4155924de09
- https://github.com/HKUDS/LightRAG/commit/c598545aa0084a427bcb19a84ade5e0ec31fa673
- https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5
- https://github.com/HKUDS/LightRAG
More HKUDS vulnerabilities
- TI-2026-44237 LightRAG: Missing Authentication for Critical API Functions in Default Configuration CVSS 3.1CRITICAL 9.8
- TI-2026-78721 Missing authentication in HKUDS Vibe-Trading FastAPI server enables RCE CVSS 4.0CRITICAL 9.3
- TI-2026-44184 Improper authentication in HKUDS LightRAG CVSS 4.0CRITICAL 9.3
- TI-2026-26034 Zero-Click Indirect Prompt Injection and Authentication Bypass via Email Polling CVSS 4.0HIGH 8.9
- TI-2026-62432 HKUDS nanobot before 0.3.0 Server-Side Request Forgery via WebFetchTool CVSS 4.0CRITICAL 9.2
- TI-2026-25310 DeepCode 1.2.0 Path Traversal via SPA Catch-All Route in main.py CVSS 4.0HIGH 8.7
Sources
- CVE-2026-85740 · CVE Program
- CVE-2026-85740 · NVD
- FIRST EPSS
- GHSA-vv3m-f8x4-7377 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences