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CVE-2026-30867 is a reachable assertion vulnerability in the CocoaMQTT client library for iOS and macOS prior to version 2.2.2. The flaw exists in the packet parsing logic, where a 4-byte malformed payload with the RETAIN flag set can be published to a shared topic on an MQTT broker. When a vulnerable client subscribes to this topic, the broker pushes the malformed packet, causing the client application to crash immediately in the background. This results in a persistent denial-of-service condition until the retained message is removed from the broker. The issue has been patched in CocoaMQTT version 2.2.2. Join the discussion | CVE Database V5 | 04/02/2026, 13:57:06 UTC Added: 04/02/2026, 14:23:21 UTC |
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