CVE-2026-15891 MQTT-SN Client - Denial of Service

The MQTT-SN client contains a denial of service vulnerability caused by improper handling of gateway records in the keepalive handler, leading to NULL pointer dereference and kernel panic when PINGREQ retries are exhausted, letting remote attackers cause a crash without authentication.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.34% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
13 September 2026
Updated
15 October 2026
Weakness
CWE-476

Vendor fix

Update to the latest version containing the fix that assigns the macro's return value to the gateway record.

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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