CVE-2026-6507

Published Apr 17, 2026

Last updated 4 months ago

CVSS high 7.5
Dns
Port (53)

Overview

Description
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).
Source
secalert@redhat.com
NVD status
Awaiting Analysis

Risk scores

CVSS 3.1

Type
Primary
Base score
7.5
Impact score
3.6
Exploitability score
3.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Severity
HIGH

Weaknesses

secalert@redhat.com
CWE-787

Social media

Hype score
Not currently trending

Related CVEs

  1. Numeric truncation error in Windows DNS allows an authorized attacker to elevate privileges locally.•CVE-2026-65797
  2. Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.•CVE-2026-65789
  3. Stack-based buffer overflow in Windows DNS allows an unauthorized attacker to execute code over a network.•CVE-2026-62878
  4. Concurrent execution using shared resource with improper synchronization ('race condition') in Windows DNS allows an unauthorized attacker to execute code over a network.•CVE-2026-62820
  5. Out-of-bounds write in Windows DNS allows an unauthorized attacker to execute code over an adjacent network.•CVE-2026-62817

References

Sources include official advisories and independent security research.