---
id: CVE-2026-91002
title: A weakness has been identified in stamparm maltrail up to 3.0.1
summary: >-
  A weakness has been identified in stamparm maltrail up to 3.0.1. This
  vulnerability affects the function _blacklist of the file core/httpd.py of the
  component Blacklist Endpoint. Executing a manipulation can lead to missing
  authenticatio…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-287
  - CWE-306
vendor: stamparm
product: maltrail
affected:
  - maltrail 3.0.0
  - maltrail 3.0.1
published: '2026-09-15'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T14:37:14.523'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91002'
references:
  - url: 'https://gist.github.com/simyat/fd48e9c257ab95405c109aec575977f1'
    label: cna@vuldb.com
  - url: 'https://github.com/stamparm/maltrail/'
    label: cna@vuldb.com
  - url: >-
      https://github.com/stamparm/maltrail/commit/d95868dff3da4d3bd4f942837a26cb7c73a797ae
    label: cna@vuldb.com
  - url: 'https://github.com/stamparm/maltrail/releases/tag/3.1'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-91002'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/931699'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/403583'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/403583/cti'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-15T13:47:10.586693Z'
epss: 0.00767
epssPercentile: 0.53569
ingestedAt: '2026-09-15T06:32:35.356Z'
---

## Overview

A weakness has been identified in stamparm maltrail up to 3.0.1. This vulnerability affects the function _blacklist of the file core/httpd.py of the component Blacklist Endpoint. Executing a manipulation can lead to missing authentication. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 3.1 is able to resolve this issue. This patch is called d95868dff3da4d3bd4f942837a26cb7c73a797ae. It is suggested to upgrade the affected component. The vendor fixed the issue the same day it was reported, in version 3.1, by gating the endpoint on an authenticated session or the new Blacklist_ALLOWLIST option.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.