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

Scope

What the vendor says is affected

• azl3 dnsmasq 2.90-1 on Azure Linux 3.0
• cbl2 dnsmasq 2.90-1 on CBL Mariner 2.0

Timeline

When this advisory changed

1. Apr 23, 2026 at 1:10 AM UTC
   Published by Microsoft Security Response Center

   The publication date reported by the vendor.

2. Sep 27, 2026 at 11:11 PM UTC
   Added to SecurityAlert

   We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-6507View CVSS, KEV, EPSS, and threat context