---
id: CVE-2026-75514
title: 'BunkerWeb is an open-source, next-generation Web Application Firewall'
summary: >-
  BunkerWeb is an open-source, next-generation Web Application Firewall. Prior
  to 1.6.13, the blacklist, greylist, and antibot modules in
  src/common/core/blacklist/blacklist.lua,
  src/common/core/greylist/greylist.lua, and src/common/core/a…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-350
published: '2026-08-20'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75514'
references:
  - url: >-
      https://github.com/bunkerity/bunkerweb/commit/1a97e5b3f977130a1b84507a9e1f703c8eec12eb
    label: security-advisories@github.com
  - url: 'https://github.com/bunkerity/bunkerweb/pull/3710'
    label: security-advisories@github.com
  - url: 'https://github.com/bunkerity/bunkerweb/releases/tag/v1.6.13'
    label: security-advisories@github.com
  - url: >-
      https://github.com/bunkerity/bunkerweb/security/advisories/GHSA-q54j-5484-pvjm
    label: security-advisories@github.com
  - url: >-
      https://github.com/bunkerity/bunkerweb/security/advisories/GHSA-q54j-5484-pvjm
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00597
epssPercentile: 0.46316
ingestedAt: '2026-09-18T20:51:25.644Z'
---

## Overview

BunkerWeb is an open-source, next-generation Web Application Firewall. Prior to 1.6.13, the blacklist, greylist, and antibot modules in src/common/core/blacklist/blacklist.lua, src/common/core/greylist/greylist.lua, and src/common/core/antibot/antibot.lua trust PTR suffix matches in IGNORE_RDNS, GREYLIST_RDNS, and ANTIBOT_IGNORE_RDNS without using get_ips to confirm that the hostname resolves to the client address. An unauthenticated remote attacker who controls a PTR record can spoof a trusted suffix to bypass rDNS-based blacklisting, gain greylist treatment, or skip an antibot challenge. This issue is fixed in version 1.6.13.

## Remediation

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