CVE-2026-41285

4.3 mediumEPSS 0.2%

Medium (4.3) in openbsd openbsd. EPSS 0.2% 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.

Severity

CVSS 3.1

4.3 medium

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS: 0.2% chance of exploitation in the next 30 days; higher than 11% of CVEs (scores of 2026-10-31)
CWEs: CWE-835, CWE-1284
Published: 2026-04-21
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

openbsd:openbsd

References

https://github.com/openbsd/src/commit/086c5738bcd3c203bcc08d024fcf983cb409115f
https://www.openbsd.org/errata78.html
https://www.rfc-editor.org/rfc/rfc4861#section-4.6

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