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

Quick assessment

Affected
HKUDS LightRAG
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 byt

CVSS 5.9 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
HKUDS LightRAG < 1.5.5 affected
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I. Basic Information for CVE-2026-85725

Vulnerability Information

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Vulnerability Title
LightRAG: Plaintext Passwords Compared Without Constant-Time Function
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
HKUDS LightRAG < 1.5.5 -

II. Public POCs for CVE-2026-85725

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III. Intelligence Information for CVE-2026-85725

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Patches & Fixes for CVE-2026-85725 (2)

Other References for CVE-2026-85725 (2)

Same Patch Batch · HKUDS · 2026-09-22 · 5 CVEs total

CVE-2026-85734 9.1 CRITICAL LightRAG: No Rate Limiting on /login Endpoint Allows Brute-Force Attacks
CVE-2026-85740 7.1 HIGH LightRAG: SSRF via IPv6-transition address bypass (NAT64, IPv4-compatible, 6to4) of the na
CVE-2026-86062 6.1 MEDIUM LightRAG: Stored Cross-Site Scripting (XSS) in the LightRAG WebUI chat/answer renderer via
CVE-2026-85709 5.3 MEDIUM LightRAG: Sensitive Information Exposure Through Raw Exception Messages in API Error Respo

IV. Related Vulnerabilities

Same product: LightRAG
Same vendor: HKUDS
Same weakness: CWE-208

V. Comments for CVE-2026-85725

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