CVE-2026-20726: Canva Affinity Information Disclosure

CVE-2026-20726 Overview

An out-of-bounds read vulnerability exists in the EMF (Enhanced Metafile) functionality of Canva Affinity. This vulnerability allows an attacker to craft a specially designed EMF file that, when processed by the application, triggers an out-of-bounds read operation. Successful exploitation could lead to the disclosure of sensitive information from memory, potentially exposing confidential data or enabling further attacks against the affected system.

Critical Impact

Exploitation of this vulnerability could allow attackers to extract sensitive information from process memory through malicious EMF files, potentially leading to information disclosure and denial of service conditions.

Affected Products

• Canva Affinity for Windows

Discovery Timeline

• 2026-03-17 - CVE-2026-20726 published to NVD
• 2026-03-19 - Last updated in NVD database

Technical Details for CVE-2026-20726

Vulnerability Analysis

This vulnerability (CWE-125: Out-of-Bounds Read) occurs when Canva Affinity processes EMF (Enhanced Metafile) files. The EMF format is a Windows-based vector graphics format that contains drawing commands and metadata. When parsing a specially crafted EMF file, the application fails to properly validate boundaries before reading memory, resulting in an out-of-bounds read condition.

The vulnerability requires local access and user interaction—meaning an attacker must convince a user to open a malicious EMF file within Canva Affinity. Once triggered, the vulnerability can read memory beyond the intended buffer boundaries, potentially exposing sensitive information stored in adjacent memory regions. Additionally, the out-of-bounds access can cause application instability leading to denial of service.

Root Cause

The root cause of CVE-2026-20726 lies in insufficient bounds checking within the EMF parsing routine. When the application processes EMF records, it does not adequately validate that index values or length fields stay within the allocated buffer boundaries. This allows malformed EMF data to force the parser to read from memory locations outside the intended data structure, leading to information disclosure.

Attack Vector

The attack vector for this vulnerability is local, requiring user interaction to open a malicious file. An attacker would need to craft a specially formatted EMF file with manipulated metadata or record structures designed to trigger the out-of-bounds read. Potential delivery methods include:

The malicious EMF file could be delivered via email attachment, embedded in a document, or downloaded from a compromised website. When the victim opens the file in Canva Affinity, the parser processes the malformed EMF records. The specially crafted values in the EMF structure cause the application to read beyond buffer boundaries, potentially leaking sensitive memory contents that could be exfiltrated or used to further compromise the system.

Detection Methods for CVE-2026-20726

Indicators of Compromise

• Canva Affinity application crashes or unexpected termination when opening EMF files
• Abnormal memory access patterns detected by endpoint protection solutions
• EMF files with malformed or suspicious record structures in user download directories
• Unusual file access patterns involving EMF files from untrusted sources

Detection Strategies

• Deploy endpoint detection and response (EDR) solutions capable of monitoring for out-of-bounds memory access patterns in Canva Affinity processes
• Implement file integrity monitoring to detect suspicious EMF files before they reach end users
• Configure email gateways to scan and sandbox EMF file attachments
• Use application whitelisting to control which applications can process EMF files

Monitoring Recommendations

• Monitor Canva Affinity process behavior for abnormal memory read patterns
• Enable crash dump collection and analysis for Canva Affinity to identify exploitation attempts
• Track EMF file ingestion through data loss prevention (DLP) solutions
• Review security logs for failed application starts or unusual terminations

How to Mitigate CVE-2026-20726

Immediate Actions Required

• Apply the latest security updates from Canva for the Affinity product line
• Block or quarantine EMF files from untrusted sources at email and web gateways
• Educate users about the risks of opening EMF files from unknown sources
• Consider disabling EMF file handling if not required for business operations

Patch Information

Canva has released security guidance for this vulnerability. Administrators should review the Canva Trust Center advisory for specific patch information and recommended actions. Additional technical details are available in the Talos Intelligence Vulnerability Report (TALOS-2025-2324).

Workarounds

• Restrict EMF file handling to trusted sources only until patches are applied
• Implement network segmentation to limit the impact of potential information disclosure
• Use sandboxed environments to open EMF files from untrusted sources
• Deploy endpoint protection solutions with memory protection capabilities to detect and prevent out-of-bounds read attempts