CVE-2026-41285

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 v3.1 Score

4.3

MEDIUM

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

EPSS — Exploit Prediction

0.0001

Probability of exploitation

0.01%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-1284 CWE-1284

CWE-835 CWE-835

Affected Products

Vendor	Product	Versions
openbsd	openbsd	< 7.8

References

Advisories & Patches

https://github.com/openbsd/src/commit/086c5738bcd3c203bcc08d024fcf983cb409115f

Other References

https://www.openbsd.org/errata78.html https://www.rfc-editor.org/rfc/rfc4861#section-4.6

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-41285? +

CVE-2026-41285 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0001, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-41285? +

CVE-2026-41285 affects products from openbsd, specifically: openbsd. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-41285? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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