Platform
python
Component
lightrag
Fixed in
1.4.15
1.4.14
CVE-2026-39413 describes a JWT algorithm confusion vulnerability affecting LightRAG, a Python-based API. This flaw allows attackers to bypass authentication by crafting malicious JWT tokens with the 'alg': 'none' parameter, effectively forging valid tokens. The vulnerability impacts versions 1.4.0 through 1.4.13 and has been resolved in version 1.4.14.
An attacker exploiting this vulnerability can gain unauthorized access to LightRAG's API endpoints. By crafting a JWT token with the 'alg': 'none' parameter, they can bypass the authentication mechanism and execute actions as any user, potentially including administrative functions. This could lead to data breaches, modification of sensitive information, or complete compromise of the LightRAG instance. The lack of signature verification makes this a particularly dangerous vulnerability, as it requires minimal effort to exploit.
This vulnerability was publicly disclosed on 2026-04-08. There are currently no known public exploits or active campaigns targeting this specific vulnerability. The vulnerability's simplicity and the widespread use of JWTs suggest that it could become a target for opportunistic attackers. Its severity is rated MEDIUM, indicating a moderate probability of exploitation.
Exploit Status
EPSS
0.01% (3% percentile)
CISA SSVC
CVSS Vector
The primary mitigation for CVE-2026-39413 is to upgrade LightRAG to version 1.4.14 or later, which includes a fix for the algorithm confusion vulnerability. If upgrading immediately is not feasible, consider implementing stricter JWT validation rules at the API gateway level. This could involve rejecting tokens with the 'alg': 'none' parameter or enforcing specific, trusted algorithms. Additionally, implement robust input validation and sanitization to prevent malicious JWTs from being processed. After upgrading, confirm the fix by attempting to forge a JWT token with 'alg': 'none' and verifying that it is rejected.
Update LightRAG to version 1.4.14 or higher to mitigate the JWT algorithm confusion vulnerability. This update corrects the lack of JWT algorithm validation, preventing attackers from forging tokens with the 'none' algorithm.
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CVE-2026-39413 is a vulnerability in LightRAG allowing attackers to forge JWT tokens by specifying 'alg': 'none', bypassing authentication and gaining unauthorized access.
You are affected if you are using LightRAG versions 1.4.0 through 1.4.13. Upgrade to 1.4.14 or later to mitigate the risk.
Upgrade LightRAG to version 1.4.14 or later. Consider implementing stricter JWT validation rules at the API gateway level as a temporary workaround.
There are currently no known active exploits, but the vulnerability's simplicity suggests it could become a target.
Refer to the LightRAG project's official documentation and release notes for the advisory related to CVE-2026-39413.
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