n 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.
| Link | Resource |
|---|---|
| https://github.com/JustDoIt0910/tinyMQTT/issues/19 | Exploit Issue Tracking Third Party Advisory |
03 Feb 2026, 21:54
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:justdoit0910:tinymqtt:2024-02-18:*:*:*:*:*:*:* | |
| References | () https://github.com/JustDoIt0910/tinyMQTT/issues/19 - Exploit, Issue Tracking, Third Party Advisory | |
| First Time |
Justdoit0910 tinymqtt
Justdoit0910 |
21 Jan 2026, 15:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.5 |
| CWE | CWE-401 |
20 Jan 2026, 16:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Published : 2026-01-20 16:16
Updated : 2026-02-03 21:54
NVD link : CVE-2025-56353
Mitre link : CVE-2025-56353
CVE.ORG link : CVE-2025-56353
JSON object : View
Missing Release of Memory after Effective Lifetime