Is CVE-2026-30867 actively exploited?

No active exploitation of CVE-2026-30867 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-30867 be exploited remotely?

Yes. CVE-2026-30867 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-30867?

CVE-2026-30867 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-30867

CWE-617Published: April 2, 2026· Updated: Apr 7, 2026

6.5

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:13.1th

Official Description

CocoaMQTT is a MQTT 5.0 client library for iOS and macOS written in Swift. Prior to version 2.2.2, a vulnerability exists in the packet parsing logic of CocoaMQTT that allows an attacker (or a compromised/malicious MQTT broker) to remotely crash the host iOS/macOS/tvOS application. If an attacker publishes the 4-byte malformed payload to a shared topic with the RETAIN flag set to true, the MQTT broker will persist the payload. Any time a vulnerable client connects and subscribes to that topic, the broker will automatically push the malformed packet. The app will instantly crash in the background before the user can even interact with it. This effectively "bricks" the mobile application (a persistent DoS) until the retained message is manually wiped from the broker database. This issue has been patched in version 2.2.2.

NVD Source

Technical Analysis

CVE-2026-30867 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.