CVE-2026-6507 HIGH

CVE-2026-6507: Dnsmasq: dnsmasq: denial of service due to out-of-bounds write in dhcp bootreply processing

Vendor Red Hat
Product Red Hat Enterprise Linux 10
Weakness CWE-787
Published April 17, 2026
Last update April 20, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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).

Key dates

02Disclosure timeline

April 17, 2026 CVE published
April 20, 2026 Record updated