lightrag-hku: No Rate Limiting on /login Endpoint Allows Brute-Force Attacks

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS

• CVE-2026-85734: 0.61% estimated exploitation activity in the next 30 days; percentile 49.23 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The POST /login endpoint has no rate limiting, account lockout, or delay on failed attempts. An attacker can submit unlimited password guesses at full network speed. Details A search for slowapi, ratelimit, lockout, or throttle in lightrag/api/ returns zero results. PoC Impact Improper restriction of authentication attempts. Any network-reachable attacker can brute-force user passwords without restriction. Once credentials are recovered, the attacker gains full authenticated access to all documents, knowledge graph, and administrative operations.

Published by the source

22 Sep 2026, 20:40 UTC

Last modified by the source

1 Oct 2026, 17:56 UTC

Source last checked

26 Oct 2026, 13:54 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-frch-4w6v-q5xx

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-frch-4w6v-q5xx

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-frch-4w6v-q5xx

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# Patch Next advisory brief: CVE-2026-85734

Advisory: lightrag-hku: No Rate Limiting on /login Endpoint Allows Brute-Force Attacks
IDs: CVE-2026-85734, GHSA-frch-4w6v-q5xx
Record: https://patchnext.com/advisories/cve-2026-85734 (revision 3, source checked 26 Oct 2026, 13:54 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: lightrag-hku 1.5.5. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI lightrag-hku: affected < 1.5.5; fixed in 1.5.5

## Suggested inspection (read-only)
- `python -m pip show lightrag-hku`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on lightrag-hku.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-frch-4w6v-q5xx (GitHub-reviewed advisory GHSA-frch-4w6v-q5xx lists affected ranges: PyPI lightrag-hku >=0 <1.5.5)
- Verified: https://osv.dev/vulnerability/GHSA-frch-4w6v-q5xx (OSV record GHSA-frch-4w6v-q5xx lists affected ranges: PyPI lightrag-hku >=0 <1.5.5 (fixed))

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