HKUDS LightRAG up to 1.5.4 Password Verification passwords.py verify_password timing discrepancy

Summaryinfo

A vulnerability was found in HKUDS LightRAG up to 1.5.4. It has been declared as problematic. This affects the function verify_password of the file lightrag/api/passwords.py of the component Password Verification. Executing a manipulation can lead to timing discrepancy. This vulnerability is handled as CVE-2026-85725. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in HKUDS LightRAG up to 1.5.4. It has been declared as problematic. This vulnerability affects the function verify_password of the file lightrag/api/passwords.py of the component Password Verification. The manipulation with an unknown input leads to a timing discrepancy vulnerability. The CWE definition for the vulnerability is CWE-208. Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not. As an impact it is known to affect confidentiality. CVE summarizes:

LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, verify_password in lightrag/api/passwords.py compares plaintext AUTH_ACCOUNTS password values with Python's == operator. The comparison can return after the first mismatching byte, creating response-time differences based on password length and matching prefixes. A network attacker with sufficiently low-latency access can repeatedly query the /login endpoint and use the timing oracle to recover a plaintext-configured password character by character. Deployments using bcrypt-prefixed password values are not affected by this comparison path. This issue is fixed in version 1.5.5.

The advisory is available at github.com. This vulnerability was named CVE-2026-85725 since 09/04/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 1.5.5 eliminates this vulnerability.

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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/

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