What’s Vulnerable › Vulnerabilities

CVE-2026-85725: LightRAG: Plaintext Passwords Compared Without Constant-Time Function

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-22 · updated 2026-09-26
• Weakness: CWE-208

Description

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.

Affected products

• HKUDS LightRAG: before 1.5.5

References

• https://github.com/HKUDS/LightRAG/commit/89849c3ed0e0380345a6b5bade027cfb9a5bf32c
• https://github.com/HKUDS/LightRAG/pull/3423
• https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5
• https://github.com/HKUDS/LightRAG/security/advisories/GHSA-c759-cx9p-mrwq
• https://github.com/HKUDS/LightRAG/security/advisories/GHSA-c759-cx9p-mrwq

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