CVE-2026-39413

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 v3 4.2 MEDIUM

4.2^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 0.5 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required HIGH

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/HKUDS/LightRAG/security/advisories/GHSA-8ffj-4hx4-9pgf	Exploit Mitigation Vendor Advisory
https://github.com/github/advisory-database/issues/7373

Configurations

Configuration 1 (hide)

cpe:2.3:a:hkuds:lightrag:*:*:*:*:*:*:*:*

History

22 Apr 2026, 16:16

Type	Values Removed	Values Added
References		() https://github.com/github/advisory-database/issues/7373 -

20 Apr 2026, 14:48

Type	Values Removed	Values Added
References	~~() https://github.com/HKUDS/LightRAG/security/advisories/GHSA-8ffj-4hx4-9pgf -~~	() https://github.com/HKUDS/LightRAG/security/advisories/GHSA-8ffj-4hx4-9pgf - Exploit, Mitigation, Vendor Advisory
First Time		Hkuds Hkuds lightrag
CPE		cpe:2.3:a:hkuds:lightrag::::::::

08 Apr 2026, 20:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-08 20:16

Updated : 2026-04-22 16:16

NVD link : CVE-2026-39413

Mitre link : CVE-2026-39413

CVE.ORG link : CVE-2026-39413

JSON object : View

Products Affected

hkuds

lightrag

CWE

CWE-347

Improper Verification of Cryptographic Signature

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