CVE-2026-56116: Dhcpcd Project Dhcpcd

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

dhcpcd through 10.3.2, fixed in commit 708b4a5, contains a memory leak vulnerability in the IPv6 Router Advertisement route information handling that allows an unauthenticated same-link attacker to cause denial of service by sending crafted Router Advertisements. Attackers can repeatedly send Router Advertisements containing Route Information options with a lifetime of zero, triggering unfreed allocations in routeinfo_findalloc() that cause linear memory exhaustion and eventual daemon crash.

Affected products

• Dhcpcd Project Dhcpcd: from 10.0.7, before 10.5.0 (fixed in 10.5.0)

Published 2026-06-23. Last modified 2026-10-08.