CVE-2026-30762: LightRAG Authentication Bypass Vulnerability

HIGH
Advisory Identifier: GHSA-mcww-4hxq-hfr3
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CVSS 7.5
CWE-287
Published
Advisory Summary

CVE-2026-30762 is a HIGH (CVSS 7.5) authentication bypass vulnerability (CWE-287: Improper Authentication) affecting LightRAG libraries in the PyPI ecosystem. The issue involves hardcoded jwt signing secret allows authentication bypass. Remediation is available by upgrading affected packages to version 1.4.13.

CVE-2026-30762 at a Glance

CVE Identifier CVE-2026-30762
GHSA Identifier GHSA-mcww-4hxq-hfr3
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-287: Improper Authentication
Affected Product LightRAG
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-30762

To remediate this vulnerability, upgrade all affected LightRAG dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

lightrag-hku fixed: 1.4.13 
pip install lightrag-hku>=1.4.13
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show lightrag-hku

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-30762, inspect your installed packages using pip:

pip show lightrag-hku

Analyze the terminal output to locate any version of LightRAG in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.4.13), your application is affected.

Note: The pip show lightrag-hku command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. In LightRAG, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Subject: Security Vulnerability Report Hardcoded JWT Secret (CVE-2026-30762) Hi HKUDS team, I'm writing to report a security vulnerability I discovered in LightRAG v1.4.10. This has been assigned CVE-2026-30762 by MITRE. Vulnerability: Hardcoded JWT signing secret Type: Improper Authentication (CWE-287) Severity: High Attack Vector: Remote / Unauthenticated Summary: The file lightrag/api/config.py (line 397) uses a default JWT secret "lightrag-jwt-default-secret" when the TOKEN_SECRET environment variable is not set. The AuthHandler in lightrag/api/auth.py (lines 24-25) uses this secret to sign and verify tokens. An unauthenticated attacker can forge valid JWT tokens using the publicly known default secret and gain access to any protected endpoint. Reproduction: 1. Install LightRAG v1.4.10 with AUTH_ACCOUNTS configured but no TOKEN_SECRET set 2. Use PyJWT to sign a token: jwt.encode({"sub": "admin", "role": "user"}, "lightrag-jwt-default-secret", algorithm="HS256") 3. Send a request to any protected endpoint with the header: Authorization: Bearer <forged_token> 4. Access is granted without valid credentials Suggested Fix: Require TOKEN_SECRET to be explicitly set when AUTH_ACCOUNTS is configured. Refuse to start the API server if authentication is enabled but no custom secret is provided. I'm following a 90-day responsible disclosure timeline from today's date. Please let me know if you have any questions or need additional information. Best regards, Venkata Avinash Taduturi

CVE-2026-30762 Affected LightRAG Versions

1 component(s)
Fixed Versions:
1.4.13
Product / Package Ecosystem Affected Versions Fixed Version
lightrag-hku
pypi/lightrag-hku
PyPI
< 1.4.13
1.4.13

References

GitHub Advisory / Wiki ADVISORY
https://github.com/HKUDS/LightRAG/security/advisories/GHSA-mcww-4hxq-hfr3
LightRAG Source Repository REPOSITORY
https://github.com/HKUDS/LightRAG

Frequently Asked Questions

What is CVE-2026-30762?
CVE-2026-30762 is a security vulnerability in LightRAG involving Hardcoded JWT Signing Secret Allows Authentication Bypass under CWE-287: Improper Authentication.
Which LightRAG versions are affected?
Affected versions include releases prior to 1.4.13 across affected packages: lightrag-hku.
What version fixes CVE-2026-30762?
Upgrading to 1.4.13 (or the latest patched release for your respective branch) resolves the vulnerability.
Is lightrag-hku affected?
Yes, lightrag-hku is affected in releases prior to 1.4.13. Upgrade your dependency to 1.4.13 or later.
What is the CVSS score of CVE-2026-30762?
CVE-2026-30762 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2026-30762?
CVE-2026-30762 is classified under CWE-287: Improper Authentication (When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.).
How can I check PyPI dependencies for CVE-2026-30762?
Run the dependency tree command: 'pip show lightrag-hku'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-mcww-4hxq-hfr3",
  "modified" : "2026-04-06T23:14:29Z",
  "published" : "2026-04-04T06:14:41Z",
  "aliases" : [ "CVE-2026-30762" ],
  "summary" : "LightRAG: Hardcoded JWT Signing Secret Allows Authentication Bypass",
  "details" : "Subject: Security Vulnerability Report Hardcoded JWT Secret (CVE-2026-30762)\n\nHi HKUDS team,\n\nI'm writing to report a security vulnerability I discovered in LightRAG v1.4.10. This has been assigned CVE-2026-30762 by MITRE.\n\nVulnerability: Hardcoded JWT signing secret\nType: Improper Authentication (CWE-287)\nSeverity: High\nAttack Vector: Remote / Unauthenticated\n\nSummary:\nThe file lightrag/api/config.py (line 397) uses a default JWT secret \"lightrag-jwt-default-secret\" when the TOKEN_SECRET environment variable is not set. The AuthHandler in lightrag/api/auth.py (lines 24-25) uses this secret to sign and verify tokens. An unauthenticated attacker can forge valid JWT tokens using the publicly known default secret and gain access to any protected endpoint.\n\nReproduction:\n1. Install LightRAG v1.4.10 with AUTH_ACCOUNTS configured but no TOKEN_SECRET set\n2. Use PyJWT to sign a token: jwt.encode({\"sub\": \"admin\", \"role\": \"user\"}, \"lightrag-jwt-default-secret\", algorithm=\"HS256\")\n3. Send a request to any protected endpoint with the header: Authorization: Bearer <forged_token>\n4. Access is granted without valid credentials\n\nSuggested Fix:\nRequire TOKEN_SECRET to be explicitly set when AUTH_ACCOUNTS is configured. Refuse to start the API server if authentication is enabled but no custom secret is provided.\n\nI'm following a 90-day responsible disclosure timeline from today's date. Please let me know if you have any questions or need additional information.\n\nBest regards,\nVenkata Avinash Taduturi",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "lightrag-hku"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.4.13"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.4.12"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/HKUDS/LightRAG/security/advisories/GHSA-mcww-4hxq-hfr3"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/HKUDS/LightRAG"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-04T06:14:41Z",
    "nvd_published_at" : null
  }
}