CVE-2026-77056 boneIO CVE debrief

Who should care

Defenders responsible for boneIO black_debian_images deployments should assess exposure and prioritize verification and remediation. This includes reviewing affected versions, changing default MQTT broker credentials, and monitoring for suspicious activity. Security teams and operators should work together to ensure affected systems are identified and remediated.

Why it matters

CVE-2026-77056 allows remote attackers to gain full access to the MQTT broker in boneIO black_debian_images due to default credentials. Defenders should prioritize verification, remediation, and credential changes to prevent unauthorized access and potential control of connected devices.

• Remote attackers can gain full read and write access to the MQTT broker
• Control of connected relays, blinds, and gates is possible
• Injection of fake entities into linked Home Assistant installations is possible
• Verification of affected versions and remediation priority is required

Technical summary

boneIO black_debian_images ships with a Mosquitto MQTT broker using default credentials publicly documented on GitHub. A remote attacker can use these credentials to gain full read and write access to the broker, allowing control of connected relays, blinds, and gates, and injection of fake entities into a linked Home Assistant installation. This issue was fixed in version 1.6.0 of the image. The vulnerability allows attackers to gain unauthorized access and control of connected devices, emphasizing the need for defenders to prioritize verification and remediation.

Defensive priority

Defenders should prioritize verifying and upgrading affected boneIO black_debian_images to version 1.6.0 or later, and changing default MQTT broker credentials.

Recommended defensive actions

• Verify and upgrade affected boneIO black_debian_images to version 1.6.0 or later
• Change default MQTT broker credentials on affected devices
• Monitor for suspicious MQTT broker activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, affected versions, and fixed version. The issue was introduced due to publicly documented default credentials for the Mosquitto MQTT broker in boneIO black_debian_images. Evidence is limited to CVE Program and NVD records, which indicate that the vulnerability was fixed in version 1.6.0 of the image. Defenders should verify affected versions and remediate accordingly.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.