CVE-2026-39413
Medium
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.
SeverityMedium
CVSS4.2
Exploit probability—
ProductHkuds Lightrag
PublishedApr 8, 2026
First seenApr 8, 2026
Weakness typeCWE-347CWE-347
How to fix
Update
- hkuds lightrag1.4.14 or later
- lightrag-hku1.4.14 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| hkuds lightrag | v < 1.4.14 | 1.4.14 |
| lightrag-hkuPyPI | v < 1.4.14 | 1.4.14 |
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