Stack Buffer Overrun in XnSoft NConvert 7.230 via TIFF File

Executive Summary

CVE-2026-30006 is a stack buffer overrun vulnerability in XnSoft NConvert version 7.230 that occurs when processing a specially crafted .tiff file.

This vulnerability causes the program to crash due to a stack buffer overflow detected by Windows security mechanisms, specifically the /GS security cookie feature.

The issue manifests when running a command like `nconvert.exe -out tiff id_000003_00` on the malicious TIFF file, leading to a security check failure or exception.

The vulnerability is exploitable, meaning an attacker could potentially leverage it to execute arbitrary code or cause a denial of service.

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Impact Analysis

This vulnerability can impact you by causing a denial of service (DoS) condition when NConvert processes a maliciously crafted TIFF file.

Because the stack buffer overrun is exploitable, an attacker might also be able to execute arbitrary code, potentially compromising the system running NConvert.

Such impacts could lead to system crashes, service interruptions, or unauthorized control over the affected system.

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Compliance Impact

I don't know

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Detection Guidance

This vulnerability can be detected by running the vulnerable NConvert 7.230 executable against a specially crafted .tiff file that triggers the stack buffer overrun.

A specific command to reproduce the issue is: `nconvert.exe -out tiff id_000003_00` where `id_000003_00` is the crafted malicious TIFF file.

When this command is executed, the program crashes with a stack buffer overrun exception detected by Windows security mechanisms, which can be observed using debugging tools such as Microsoft Windows Debugger.

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Mitigation Strategies

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