CVE-2026-19741 Zephyr OpenThread - Authentication Bypass

Zephyr OpenThread integration contains an authentication bypass caused by a default publicly known Joining Device Credential (PSKd) in CONFIG_OPENTHREAD_JOINER_PSKD, letting unauthenticated attackers within radio range join and control uncommissioned devices, exploit requires joiner autostart enabled with default PSKd.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.27% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
23 October 2026
Updated
25 October 2026
Weakness
CWE-1392

Vendor fix

Remove default PSKd and provision unique per-device PSKd; disable joiner autostart or set a secure PSKd.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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