PT-2026-33860 · Openbsd · Openbsd

Published 2026-04-12 · Updated 2026-04-21 · CVE-2026-41285

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions OpenBSD versions prior to 7.8

Description The slaacd and rad daemons contain an infinite loop that occurs when receiving a crafted ICMPv6 Neighbor Discovery (ND) option over a local network with a length of zero. This is caused by the expression nd opt len * 8 - 2 being executed without a prior check to verify if the variable nd opt len is zero.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Integer Overflow

Infinite Loop

Weakness Enumeration

CWE-190

CWE-1284

CWE-835

Related Identifiers

BDU:2026-06323

CVE-2026-41285

Affected Products

Openbsd

References · 8

• 🔥 https://github.com/Rat5ak/CVE-2026-41285-OpenBSD-v6daemons-go-brrr · Exploit
• https://github.com/openbsd/src/commit/086c5738bcd3c203bcc08d024fcf983cb409115f · Patch
• https://bdu.fstec.ru/vul/2026-06323 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-41285 · Security Note
• https://twitter.com/infoflowcloud/status/2046603445054898307 · Twitter Post
• https://rfc-editor.org/rfc/rfc4861#section-4.6 · Note
• https://twitter.com/CVEnew/status/2046601528039903353 · Twitter Post
• https://openbsd.org/errata78.html · Note