CVE-2026-41285

EUVD-2026-23996
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mitreCNA
4.3 MEDIUM
ADJACENT_NETWORK
LOW
NONE
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
openbsdopenbsd
𝑥
≤ 7.8
CNA
Common Weakness Enumeration
References
https://github.com/openbsd/src/commit/086c5738bcd3c203bcc08d024fcf983cb409115f
https://www.openbsd.org/errata78.html
https://www.rfc-editor.org/rfc/rfc4861#section-4.6