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The vulnerability CVE-2025-53855 is an out-of-bounds write flaw within the XML parser of Fade In version 4.2.0, triggered when processing malicious .fadein project files. The parser incorrectly handles memory allocation for XML elements, attributes, or text nodes due to inadequate bounds checking. Specifically, when parsing a crafted file with manipulated size fields or excessively long values, the parser uses unsafe copy operations like memcpy without validating destination buffer sizes. This allows data to be written beyond the allocated heap or stack buffer boundaries. The corruption occurs during the file loading phase, where the parser calculates storage needs based on untrusted file input. An attacker can design XML structures that cause integer overflows or underflows in size calculations, leading to a buffer overflow. The out-of-bounds write primitive can overwrite adjacent memory, including function pointers or vtable addresses, potentially enabling arbitrary code execution. Exploitation requires user interaction to open a malicious file, which could be delivered via phishing or compromised websites. The vulnerability stems from legacy code in the XML parsing library that lacks modern security checks. By controlling the write offset and content, an attacker can achieve remote code execution under the privileges of the user running Fade In. This poses a significant risk as the software is used for screenwriting, making targeted attacks feasible. Memory corruption details involve corrupting heap metadata or stack return addresses, leading to application crash or shellcode execution. The flaw highlights common issues in file format parsers where input validation is neglected. Secure coding practices like using bounded functions and rigorous fuzz testing could prevent such vulnerabilities. Technical analysis indicates the vulnerability is in the XML node processing routine, where node counts or attribute lengths are trusted without verification. This allows crafted input to exceed predefined array limits, resulting in writes to unauthorized memory locations. The exploitation can be stabilized to achieve persistent control over the affected system. Overall, this CVE demonstrates critical memory safety failures in specialized software parsers.
Platform: Fade In
Version: 4.2.0
Vulnerability: Out-of-bounds write
Severity: Critical
Date: 10/28/2025
Prediction: Patch Pending
What Undercode Say:
Analytics
Check Fade In version fadein --version List related processes ps aux | grep fadein Examine file type file malicious.fadein
How Exploit
Craft malicious .fadein file.
Trigger parsing via opening.
Exploit memory corruption.
Achieve code execution.
Protection from this CVE
Update software version.
Avoid untrusted files.
Use memory protections.
Impact
Remote Code Execution
System Compromise
Data Loss
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Sources:
Reported By: nvd.nist.gov
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