CVE-2026-56114

A flaw was found in dhcpcd. An unauthenticated attacker on the same network link could exploit a one-byte stack out-of-bounds write vulnerability in the dhcp6makemessage function. By sending a specially crafted DHCPv6 ADVERTISE message with an oversized option, the attacker can write beyond a...

CVE-2026-56114 dhcpcd Stack Out-of-Bounds Write in dhcp6_makemessage()

dhcpcd through 10.3.2, fixed in commit 2f00c7b, contains a one-byte stack out-of-bounds write vulnerability in dhcp6makemessage in src/dhcp6.c that allows unauthenticated same-link attackers to write beyond a fixed local buffer by serializing an oversized RFC6603 OPTIONPDEXCLUDE option body...