Description
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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenBSD | OpenBSD | ≤ 7.8 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
Rat5ak/CVE-2026-41285-OpenBSD-v6daemons-go-brrr ★ 0 · May 5, 2026
One IPv6 ND option with length zero. One missing check. Daemon walks backward and lives in the loop. Reported to OpenBSD, fixed, CVE assigned.
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- WID-SEC-2026-1184 OpenBSD: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Apr 20, 2026