CVE-2025-66633 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-2025-66633 represents a critical out-of-bounds read flaw within the EMF (Enhanced Metafile) processing component of Canva Affinity software. This type of vulnerability falls under the category of memory safety issues and is classified as CWE-125 - "Out-of-bounds Read" according to the Common Weakness Enumeration catalog. The flaw manifests specifically when the application processes specially crafted EMF files, which are vector graphics formats commonly used for storing device-independent graphics. The vulnerability exists in the software's handling of EMF file structures where insufficient bounds checking occurs during the parsing of metafile records, allowing an attacker to manipulate the file contents in a way that triggers memory access violations.
The technical exploitation of this vulnerability requires an attacker to prepare a malicious EMF file that contains malformed data structures designed to bypass normal input validation mechanisms. When Canva Affinity attempts to render or process this crafted file, the application's EMF parser reads memory locations beyond the allocated buffer boundaries. This out-of-bounds memory access can result in information disclosure as the application may inadvertently expose sensitive data from adjacent memory regions, including but not limited to stack contents, heap data, or other process memory segments that contain confidential information. The vulnerability's impact is particularly concerning given that EMF files are often shared between users and can be embedded in various document formats, making the attack surface broader than initially apparent.
The operational implications of CVE-2025-66633 extend beyond simple information disclosure, as the vulnerability can potentially enable more sophisticated attacks within the context of the broader ATT&CK framework. The out-of-bounds read could serve as a precursor to privilege escalation or code execution attempts, particularly when combined with other vulnerabilities or when the target application has elevated privileges. Attackers leveraging this vulnerability might gain access to cryptographic keys, user credentials, or other sensitive information stored in memory, which could then be used for further exploitation. The vulnerability affects the application's integrity and confidentiality, potentially allowing adversaries to perform reconnaissance activities or establish persistent access to systems where Canva Affinity is deployed.
Mitigation strategies for CVE-2025-66633 should focus on implementing robust input validation and bounds checking mechanisms within the EMF processing pipeline. Organizations should prioritize updating to the latest version of Canva Affinity where the vulnerability has been addressed through proper memory management techniques and enhanced file parsing controls. Additionally, implementing defensive measures such as sandboxing EMF file processing, employing memory corruption detection tools, and establishing strict file validation protocols can help reduce the attack surface. Network-based mitigations such as email filtering and web application firewalls should also be considered to prevent the delivery of malicious EMF files to target systems. The vulnerability demonstrates the importance of secure coding practices and adherence to memory safety principles, particularly in applications that process external file formats, aligning with ATT&CK techniques related to privilege escalation and information gathering through memory analysis.