TI-2026-28395 Aliases CVE-2026-39413 GHSA-8ffj-4hx4-9pgf

LightRAG has a JWT Algorithm Confusion Vulnerability in LightRAG API

MEDIUM 64CWE-347Published 2026-04-08 · Updated 2026-04-22

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-347.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00181 7th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed LightRAG (HKUDS): 1.4.14lightrag-hku (PyPI): 1.4.14

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
HKUDS	LightRAG	before 1.4.14	1.4.14	Patch available	CNA
—	lightrag-hku (PyPI)	before 1.4.14	1.4.14	Patch available	GHSA-8ffj-4hx4-9pgf

LightRAG VendorHKUDS Affected before 1.4.14 Fixed in 1.4.14 Patch available CNA
lightrag-hku (PyPI) Vendor— Affected before 1.4.14 Fixed in 1.4.14 Patch available GHSA-8ffj-4hx4-9pgf

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:hkuds:lightrag::::::::	before 1.4.14	Vulnerable	HKUDS

cpe:2.3:a:hkuds:lightrag:*:*:*:*:*:*:*:* Versions before 1.4.14 Vulnerable ·HKUDS

Remediation

Fix · CNA LightRAG (HKUDS) Fixed in 1.4.14
Fix · GHSA-8ffj-4hx4-9pgf lightrag-hku (PyPI) Fixed in 1.4.14 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-39413
2026-10-03 Alias added: GHSA-8ffj-4hx4-9pgf

References

Exploit 1

https://github.com/HKUDS/LightRAG/security/advisories/GHSA-8ffj-4hx4-9pgf

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-39413

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences