CVE-2026-41285
OpenBSD slaacd and rad Infinite Loop ICMPv6 Neighbor Discovery Vulnerability
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.
INFO
Published Date :
April 21, 2026, 12:16 a.m.
Last Modified :
April 21, 2026, 12:16 a.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update OpenBSD to version 7.9 or later.
- Apply relevant security patches from OpenBSD.
- Restart the slaacd and rad services.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-41285.
| URL | Resource |
|---|---|
| https://github.com/openbsd/src/commit/086c5738bcd3c203bcc08d024fcf983cb409115f | |
| https://www.openbsd.org/errata78.html | |
| https://www.rfc-editor.org/rfc/rfc4861#section-4.6 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-41285 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-41285
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-41285 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-41285 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Apr. 21, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Added CWE CWE-1284 Added Reference https://github.com/openbsd/src/commit/086c5738bcd3c203bcc08d024fcf983cb409115f Added Reference https://www.openbsd.org/errata78.html Added Reference https://www.rfc-editor.org/rfc/rfc4861#section-4.6