CVE-2026-39413: Hkuds Lightrag

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Hkuds Lightrag: before 1.4.14 (fixed in 1.4.14)

Published 2026-04-08. Last modified 2026-07-24.