CVE-2026-85734

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.

• CWE-307

• https://github.com/HKUDS/LightRAG/commit/135bc9056e9ecd800c1abe2f2ce24d1a86622a54
• https://github.com/HKUDS/LightRAG/pull/3424
• https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5
• https://github.com/HKUDS/LightRAG/security/advisories/GHSA-frch-4w6v-q5xx

Published

Sep 22, 2026

Last Modified

Sep 22, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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