CVE-2026-41285

mediumpriority · track · 10EPSS 0.002 · 11 %ileexploit · PoCDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

0.21% (11th) EPSS

CVSS 4.3 · medium

Is it mine?

4 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

4.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.14.3mediumAV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · FSTEC (BDU) RU

v3.14.3mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU

v3.14.3mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · cve@mitre.org USexploitability 2.8 · impact 1.4

v3.14.1mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:Psecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-835USprimaryCWE-1284USCWE-1284USCWE-190USCWE-835US

exploits (1)

Public proof-of-concept and weaponised exploit code.

Rat5ak/CVE-2026-41285-OpenBSD-v6daemons-go-brrrOne IPv6 ND option with length zero. One missing check. Daemon walks backward and lives in the loop. Reported to OpenBSD, fixed, CVE assigned.PoC · poc_in_github

affected products (4)

Products and version ranges known to be affected.

OpenBSD OpenBSDall versionscert_bundDEcpe:/a:openbsd:openbsd:-
OpenBSD OpenBSD≤ 0 ≤7.8enisa_euvdEU
The OpenBSD Project OpenBSD≤ 7.8fstec_bduRU
openbsd openbsd≤ 7.8nvdUScpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1184OpenBSD: Schwachstelle ermöglicht Denial of ServiceDeutsch2026-04-20csaf · cert_bundDE
Ein Angreifer aus einem angrenzenden Netzwerk kann eine Schwachstelle in OpenBSD ausnutzen, um einen Denial of Service Angriff durchzuführen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd NVD CVE.org MITRE

published 2026-04-21modified 2026-06-17

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+1370 more

references (8)

External citations — patches, advisories, analysis.

scry

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