CVE-2025-66503 in Affinity
Summary
by MITRE • 03/17/2026
An out-of-bounds read vulnerability exists in the EMF functionality of Canva Affinity. By using a specially crafted EMF file, an attacker could exploit this vulnerability to perform an out-of-bounds read, potentially leading to the disclosure of sensitive information.
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Analysis
by VulDB Data Team • 03/21/2026
The vulnerability identified as CVE-2025-66503 represents a critical out-of-bounds read flaw within the EMF (Enhanced Metafile) processing functionality of Canva Affinity software. This type of vulnerability falls under the common weakness enumeration CWE-125 which specifically addresses out-of-bounds read conditions where programs access memory locations beyond the intended buffer boundaries. The flaw exists in how the application handles EMF file parsing operations, particularly when processing specially crafted malicious input files that manipulate the metafile structure to trigger memory access violations.
The technical execution of this vulnerability requires an attacker to prepare a malicious EMF file that exploits the boundary checking mechanisms within the Affinity software's graphics processing pipeline. When the vulnerable application attempts to parse and render this crafted file, it accesses memory locations outside the allocated buffer regions, potentially exposing sensitive data from adjacent memory segments. This out-of-bounds read operation can occur during the interpretation of EMF record structures, where the software fails to properly validate the length and content of metafile records before attempting to process them. The vulnerability demonstrates a classic buffer overread condition that can be leveraged to extract information from the application's memory space.
From an operational impact perspective, this vulnerability poses significant risks to users of Canva Affinity software as it could enable attackers to extract confidential information from the application's memory during the rendering process. The sensitive data potentially exposed could include internal application state information, user credentials, temporary files, or other confidential data stored in adjacent memory locations. The attack vector is particularly concerning as it requires no user interaction beyond opening the malicious file, making it a passive exploitation scenario that could be weaponized in targeted attacks against users. This vulnerability aligns with ATT&CK technique T1059.007 for execution through scripting and T1566.001 for initial access through spearphishing attachments.
The exploitation of CVE-2025-66503 demonstrates the importance of proper input validation and boundary checking in graphics processing libraries, particularly those handling proprietary file formats. Organizations using Canva Affinity should prioritize immediate patching of this vulnerability to prevent potential data leakage and unauthorized information disclosure. Mitigation strategies should include implementing strict input validation for EMF files, deploying application sandboxing mechanisms, and monitoring for suspicious file access patterns. Additionally, users should exercise caution when opening EMF files from untrusted sources and consider implementing network-based intrusion detection systems to identify potential exploitation attempts. The vulnerability underscores the need for comprehensive memory safety practices in graphics rendering engines and highlights the critical importance of regular security assessments for file processing components within creative software applications.