CVE-2026-24822
Unknown Unknown - Not Provided
Heap-Based Buffer Overflow in wxhelper Module of mongoose.C

Publication date: 2026-01-27

Last updated on: 2026-01-27

Assigner: Government Technology Agency of Singapore Cyber Security Group (GovTech CSG)

Description
Out-of-bounds Write, Heap-based Buffer Overflow vulnerability in ttttupup wxhelper (src modules). This vulnerability is associated with program files mongoose.C. This issue affects wxhelper: through 3.9.10.19-v1.
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Meta Information
Published
2026-01-27
Last Modified
2026-01-27
Generated
2026-06-16
AI Q&A
2026-01-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-24822
EUVD
EUVD-2026-4803
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
ttttupup wxhelper to 3.9.10.19 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
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Executive Summary

This vulnerability is a heap-based buffer overflow caused by an out-of-bounds write in the wxhelper project's src modules, specifically in the mongoose.C file. It relates to improper handling of the MQTT variable length header, which could allow an attacker to write data beyond the allocated buffer, potentially leading to crashes or arbitrary code execution. [1]

Impact Analysis

The vulnerability can lead to severe security impacts including remote code execution, denial of service, or system compromise because it allows an attacker to exploit the heap-based buffer overflow by sending specially crafted MQTT packets. The CVSS score of 10.0 indicates it is critical and exploitable remotely without authentication. [1]

Mitigation Strategies

To mitigate this vulnerability, you should apply the security patch that fixes the improper handling of the MQTT variable length header in the wxhelper project. This patch was merged in pull request #515 on April 23, 2025, and addresses the issue in the src/mongoose.c file. Updating wxhelper to a version that includes this patch or manually applying the patch will eliminate the vulnerability. [1]

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