CVE-2025-56353

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Source
https://cve.org/CVERecord?id=CVE-2025-56353
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-56353.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-56353
Published
2026-01-20T16:16:05.700Z
Modified
2026-03-13T03:35:04.442371Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Git /

Affected ranges

Database specific

unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "2024-02-18"
            }
        ]
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-56353.json"