# lightrag-hku: Plaintext Passwords Compared Without Constant-Time Function

Advisory record · `GHSA-c759-cx9p-mrwq`

- **Identifiers:** `GHSA-c759-cx9p-mrwq` · `CVE-2026-85725` · `PYSEC-2026-4061`
- **State:** Confirmed
- **Severity:** CVSS 5.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-208](https://cwe.mitre.org/data/definitions/208.html)
- **Tags:** [CWE-208](https://agentprime.io/advisories/tag/cwe-208.md)
- **Published:** 22 Sept 2026
- **Updated:** 1 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 22 Sept 2026, 20:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `lightrag-hku` (PyPI): affected `<1.5.5`; fixed in `1.5.5`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The lightrag-hku package, versions before 1.5.5, compares plaintext passwords stored in AUTH_ACCOUNTS with a non-constant-time comparison. An attacker with low-latency access could use timing differences to recover the password one character at a time, and this affects only deployments that store unhashed passwords there. Upgrade to lightrag-hku 1.5.5 or later. Using hashed passwords in AUTH_ACCOUNTS avoids the issue.

Written 1 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 5.9 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0045, the 38th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:09 UTC: First seen by agentprime
- 31 Oct 2026, 14:09 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-c759-cx9p-mrwq)

## Sources

- [GitHub Advisory Database: GHSA-c759-cx9p-mrwq](https://github.com/advisories/GHSA-c759-cx9p-mrwq)
- [OSV: GHSA-c759-cx9p-mrwq](https://osv.dev/vulnerability/GHSA-c759-cx9p-mrwq)
- <https://github.com/HKUDS/LightRAG/security/advisories/GHSA-c759-cx9p-mrwq>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-85725>
- <https://github.com/HKUDS/LightRAG/pull/3423>
- <https://github.com/HKUDS/LightRAG/commit/89849c3ed0e0380345a6b5bade027cfb9a5bf32c>
- <https://github.com/HKUDS/LightRAG>
- <https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-c759-cx9p-mrwq>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-c759-cx9p-mrwq/>. Everything for agents: <https://agentprime.io/llms.txt>.