---
id: CVE-2026-6507
title: A flaw was found in dnsmasq
summary: >-
  A flaw was found in dnsmasq. A remote attacker could exploit an out-of-bounds
  write vulnerability by sending a specially crafted BOOTREPLY (Bootstrap
  Protocol Reply) packet to a dnsmasq server configured with the
  `--dhcp-split-relay` opt…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-787
published: '2026-04-17'
updated: '2026-08-26'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-6507'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-6507'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2459181'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00482
epssPercentile: 0.40704
ingestedAt: '2026-08-26T17:47:12.181Z'
---

## Overview

A flaw was found in dnsmasq. A remote attacker could exploit an out-of-bounds write vulnerability by sending a specially crafted BOOTREPLY (Bootstrap Protocol Reply) packet to a dnsmasq server configured with the `--dhcp-split-relay` option. This can lead to memory corruption, causing the dnsmasq daemon to crash and resulting in a denial of service (DoS).

## Remediation

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