CVE-2026-41285: OpenBSD

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

In OpenBSD through 7.8, the slaacd and rad daemons have an infinite loop when they receive a crafted ICMPv6 Neighbor Discovery (ND) option (over a local network) with length zero, because of an "nd_opt_len * 8 - 2" expression with no preceding check for whether nd_opt_len is zero.

Affected products

• OpenBSD OpenBSD: up to and including 7.8

Published 2026-04-21. Last modified 2026-06-17.