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CVE-2025-56352
tinyMQTT Broker Resource Exhaustion via Malformed CONNECT Packet
Last Modified: May 18, 2026
Published: May 18, 2026
CVE-2025-56353
In tinyMQTT commit 6226ade15bd4f97be2d196352e64dd10937c1962 (2024-02-18), a memory leak occurs due to the broker's failure to validate or reject malformed UTF-8 strings in topic filters. An attacker can exploit this by sending repeated subscription requests with arbitrarily large or invalid filter payloads. Each request causes memory to be allocated for the malformed topic filter, but the broker does not free the associated memory, leading to unbounded heap growth and potential denial of service under sustained attack.
Last Modified: Feb 03, 2026
Published: Jan 20, 2026
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