HKUDS LightRAG up to 1.5.4 Login Endpoint lightrag_server.py excessive authentication

Summaryinfo

A vulnerability identified as problematic has been detected in HKUDS LightRAG up to 1.5.4. Affected by this vulnerability is an unknown functionality of the file lightrag/api/lightrag_server.py of the component Login Endpoint. This manipulation causes excessive authentication. The identification of this vulnerability is CVE-2026-85734. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in HKUDS LightRAG up to 1.5.4. Affected by this vulnerability is some unknown functionality of the file lightrag/api/lightrag_server.py of the component Login Endpoint. The manipulation with an unknown input leads to a excessive authentication vulnerability. The CWE definition for the vulnerability is CWE-307. The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame, making it more susceptible to brute force attacks. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-85734 since 09/04/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1110.001 for this issue.

Upgrading to version 1.5.5 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• HKUDS

Name

• LightRAG

Version

• 1.5.0
• 1.5.1
• 1.5.2
• 1.5.3
• 1.5.4

Website

• Product: https://github.com/HKUDS/LightRAG/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion