Vulnerability · Published Apr 8, 2026 · Assigned by GitHub_M
CVE-2026-39413LightRAG has a JWT Algorithm Confusion Vulnerability in LightRAG API
Medium 4.2
In plain English
A medium-severity security flaw in LightRAG from HKUDS. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | lightrag-hku | 1.4.14 | GHSA-8ffj-4hx4-9pgf |
| PyPI | lightrag-hku | 1.4.14 | PYSEC-2026-2592 |
Affected products (as reported)
Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N