Out-of-Bounds Write Vulnerability in dnsmasq Affects Remote Server Operations
CVE-2026-6507

7.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
17 April 2026

What is CVE-2026-6507?

A vulnerability present in dnsmasq allows a remote attacker to exploit an out-of-bounds write flaw by sending a specially crafted Bootstrap Protocol Reply (BOOTREPLY) packet to a dnsmasq server that is configured with the '--dhcp-split-relay' option. This exploitation can lead to memory corruption, potentially causing the dnsmasq daemon to crash and resulting in a denial of service (DoS). Organizations using dnsmasq should evaluate their systems for this vulnerability to enhance their cybersecurity posture.

References

https://access.redhat.com/security/cve/CVE-2026-6507
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2459181
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.