What is CVE-2026-39413?

CVE-2026-39413 is a medium-severity vulnerability in Hkuds Lightrag, classified under Improper Verification of Cryptographic Signature. CVSS score: 4.2/10. Published 2026-04-08.

How severe is CVE-2026-39413?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Vulnerability in Hkuds Lightrag

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 t…

EPSS: 0.000 (5.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N.

Affected products

Hkuds Lightrag — versions < 1.4.14

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

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

Frequently asked questions

What is CVE-2026-39413?: CVE-2026-39413 is a medium-severity vulnerability in Hkuds Lightrag, classified under Improper Verification of Cryptographic Signature. CVSS score: 4.2/10. Published 2026-04-08.
How severe is CVE-2026-39413?: Medium severity. CVSS v3 base score is 4.2 out of 10.