Vulnerability Description
LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.4.14, the LightRAG API is vulnerable to a JWT algorithm confusion attack where an attacker can forge tokens by specifying 'alg': 'none' in the JWT header. Since the jwt.decode() call does not explicitly deny the 'none' algorithm, a crafted token without a signature will be accepted as valid, leading to unauthorized access. This vulnerability is fixed in 1.4.14.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hkuds | Lightrag | < 1.4.14 |
Related Weaknesses (CWE)
References
- https://github.com/HKUDS/LightRAG/security/advisories/GHSA-8ffj-4hx4-9pgfExploitMitigationVendor Advisory
- https://github.com/github/advisory-database/issues/7373
FAQ
What is CVE-2026-39413?
CVE-2026-39413 is a vulnerability with a CVSS score of 4.2 (MEDIUM). LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.4.14, the LightRAG API is vulnerable to a JWT algorithm confusion attack where an attacker can forge tokens by specifying '...
How severe is CVE-2026-39413?
CVE-2026-39413 has been rated MEDIUM with a CVSS base score of 4.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-39413?
Check the references section above for vendor advisories and patch information. Affected products include: Hkuds Lightrag.