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

September 22, 2026

When plaintext passwords are stored in AUTH_ACCOUNTS, the comparison uses Python’s == operator which is not constant-time. An attacker with low-latency access can exploit timing differences to recover the password character by character.

References

github.com/HKUDS/LightRAG/commit/89849c3ed0e0380345a6b5bade027cfb9a5bf32c
github.com/HKUDS/LightRAG/pull/3423
github.com/HKUDS/LightRAG/releases/tag/v1.5.5
github.com/HKUDS/LightRAG/security/advisories/GHSA-c759-cx9p-mrwq
github.com/advisories/GHSA-c759-cx9p-mrwq
nvd.nist.gov/vuln/detail/CVE-2026-85725

Code Behaviors & Features

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