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, because of an "nd_opt_len * 8 - 2" expression with no preceding check for whether nd_opt_len is zero

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MEDIUM

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

Published Apr 20, 2026

4.3

MEDIUM

CVSS 3.1

EPSS 0.25%

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 OpenBSD Product OpenBSD Default
unaffected
- Version
  0
  Status
  affected
  Constraints
  <=7.8

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

OpenBSD

unaffected

Version	Status	Constraints
0	affected	<=7.8

Remediation

No remediation recorded yet.

Weaknesses (2)

CWE-1284

CWE-835

References (4)

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-23996
Advisory
https://github.com/openbsd/src/commit/086c5738bcd3c203bcc08d024fcf983cb409115f
Patch
https://www.openbsd.org/errata78.html
ProductRelease Notes
https://www.rfc-editor.org/rfc/rfc4861#section-4.6
Not Applicable

Link	Providers	Tags
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-23996		Advisory
https://github.com/openbsd/src/commit/086c5738bcd3c203bcc08d024fcf983cb409115f		Patch
https://www.openbsd.org/errata78.html		ProductRelease Notes
https://www.rfc-editor.org/rfc/rfc4861#section-4.6		Not Applicable