Vulnerability Description
LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.4, when LightRAG is deployed with LIGHTRAG_API_KEY set but AUTH_ACCOUNTS unset, X-API-Key protection can be bypassed because lightrag/api/auth.py falls back to a hardcoded DEFAULT_TOKEN_SECRET, /auth-status and /login can mint guest JWTs, and combined_dependency in lightrag/api/utils_api.py accepts a valid guest token before checking the API key. A remote unauthenticated attacker can call endpoints guarded by combined_auth, including document read, upload, deletion, graph mutation, and query endpoints. This vulnerability is fixed in 1.5.4.
Related Weaknesses (CWE)
References
- https://github.com/HKUDS/LightRAG/commit/f7819aa3a49a9d8d92eed8251d82d6ebcafa8cb
- https://github.com/HKUDS/LightRAG/pull/3319
- https://github.com/HKUDS/LightRAG/releases/tag/v1.5.4
- https://github.com/HKUDS/LightRAG/security/advisories/GHSA-f4vv-55c2-5789
- https://github.com/HKUDS/LightRAG/security/advisories/GHSA-f4vv-55c2-5789
FAQ
What is CVE-2026-61740?
CVE-2026-61740 is a documented vulnerability. LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.4, when LightRAG is deployed with LIGHTRAG_API_KEY set but AUTH_ACCOUNTS unset, X-API-Key protection can be bypassed beca...
How severe is CVE-2026-61740?
CVSS scoring is not yet available for CVE-2026-61740. Check NVD for updates.
Is there a patch for CVE-2026-61740?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.