critical9.1
CVE-2026-85734
lightrag-hku: No Rate Limiting on /login Endpoint Allows Brute-Force Attacks
Impact
LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, the POST /login endpoint in lightrag/api/lightrag_server.py does not impose a rate limit, account lockout, delay, or counter for failed authentication attempts. A network attacker can submit password guesses at full request speed until a valid account password is found. Successful credential recovery grants authenticated access to documents, the knowledge graph, and administrative operations. This issue is fixed in version 1.5.5.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | lightrag-hku | < 1.5.5 | 1.5.5 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-frch-4w6v-q5xx
- https://github.com/HKUDS/LightRAG/security/advisories/GHSA-frch-4w6v-q5xx
- https://nvd.nist.gov/vuln/detail/CVE-2026-85734
- https://github.com/HKUDS/LightRAG/pull/3424
- https://github.com/HKUDS/LightRAG/commit/135bc9056e9ecd800c1abe2f2ce24d1a86622a54
- https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5