LightRAG: Plaintext Passwords Compared Without Constant-Time Function (CVE-2026-85725) | HOL Guard CVE

Medium · CVSS 5.9CVE-2026-85725

LightRAG: Plaintext Passwords Compared Without Constant-Time Function

Answer in brief

CVE-2026-85725 records a Medium severity (CVSS 5.9) vulnerability in LightRAG: Plaintext Passwords Compared Without Constant-Time Function. The current sources do not mark it as known exploited. The current feed maps HKUDS/LightRAG (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 22, 2026Updated Sep 22, 2026Source checked Sep 22, 2026First seen by HOL Sep 22, 2026Material review Sep 22, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.9
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 5.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps HKUDS/LightRAG (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
HKUDS/LightRAGgeneric	<1.5.5	1.5.5

Recommended response

Check inventory. Check lockfiles and deployed manifests for HKUDS/LightRAG.
Review the reported fix. Update HKUDS/LightRAG to 1.5.5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 22, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.