CVE-2026-39413
MediumCVSS 4.2Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
LightRAG prior to version 1.4.14 is vulnerable to a JWT algorithm confusion attack where an attacker can forge tokens by specifying 'alg': 'none' in the JWT header. The jwt.decode() call does not explicitly deny the 'none' algorithm, so a crafted token without a signature is accepted as valid, leading to unauthorized access. Fixed in version 1.4.14.
Risk Assessment
An attacker can gain unauthorized access to the LightRAG API, potentially leading to data theft or system manipulation.
Recommendation
Update LightRAG to version 1.4.14 or later, which includes the fix for the JWT algorithm confusion vulnerability.
Original NVD description (English source)
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.