Medium severity · published Apr 20, 2026
CVE-2026-41285
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,…
4.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenBSD · OpenBSD
through 7.8 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41285
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-41285
Patch
https://github.com/openbsd/src/commit/086c5738bcd3c203bcc08d024fcf983cb409115f
Product
https://www.openbsd.org/errata78.html
Not Applicable
https://www.rfc-editor.org/rfc/rfc4861#section-4.6
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