CVE-2026-39413
LightRAG has a JWT Algorithm Confusion Vulnerability in LightRAG API
4.2CVSSMEDIUM
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 Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:HAttack ComplexityHigh
PR:HPrivileges RequiredHigh
UI:RUser InteractionRequired
Scope
S:UScopeUnchanged
Impact
C:HConfidentialityHigh
I:NIntegrityNone
A:NAvailabilityNone
Weaknesses
Affected Products
Attack Graph
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Exploitability
Workaround Available
MITRE ATT&CK
1 technique Collection
References
Timeline
Published
Apr 8, 2026
Last Updated
Apr 22, 2026
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