CVE-2025-56353
7.5 · HIGHOverview
CVE-2025-56353 is a high-severity vulnerability affecting justdoit0910 tinymqtt. It was published on January 20, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
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.
Remediation
Check the references section for vendor advisories and patches from justdoit0910. Update tinymqtt to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
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Frequently Asked Questions
What is CVE-2025-56353?
CVE-2025-56353 is a high-severity vulnerability affecting justdoit0910 tinymqtt. It was published on January 20, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2025-56353?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-56353?
Check the references section for vendor advisories and patches from justdoit0910. Update tinymqtt to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-56353?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-56353 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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