CVE-2025-58427: Canva Affinity Information Disclosure

CVE-2025-58427 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 malicious EMF file that, when processed by the application, triggers an out-of-bounds memory read operation. Successful exploitation could lead to the disclosure of sensitive information from memory and potentially cause application crashes, resulting in denial of service conditions.

Critical Impact

Attackers can leverage specially crafted EMF files to read memory outside allocated boundaries, potentially exposing sensitive data and causing application instability.

Affected Products

• Canva Affinity for Windows (all versions prior to patch)

Discovery Timeline

• 2026-03-17 - CVE-2025-58427 published to NVD
• 2026-03-19 - Last updated in NVD database

Technical Details for CVE-2025-58427

Vulnerability Analysis

This vulnerability is classified as CWE-125 (Out-of-Bounds Read), a memory safety issue that occurs when the application reads data from memory locations outside the intended buffer boundaries. The flaw resides specifically within Canva Affinity's EMF file processing functionality, which handles Enhanced Metafile graphics format.

The vulnerability requires local access and user interaction to exploit, as the victim must open a maliciously crafted EMF file. When the vulnerable application parses the specially constructed EMF data, it fails to properly validate buffer boundaries, allowing read operations to access memory regions beyond the allocated space. This can result in exposure of sensitive information that may reside in adjacent memory locations, including potential credentials, cryptographic keys, or other application data.

Additionally, the out-of-bounds read operation can trigger application crashes when accessing invalid memory addresses, leading to denial of service conditions that disrupt user workflows.

Root Cause

The root cause of this vulnerability is improper bounds checking during EMF file parsing operations. When Canva Affinity processes EMF records, it fails to adequately validate that the data being read falls within the expected buffer boundaries. This oversight allows malformed EMF structures to direct the application to read from memory locations outside the intended data range, violating memory safety guarantees and exposing the application to information disclosure risks.

Attack Vector

The attack requires an adversary to create a specially crafted EMF file containing malicious structures designed to trigger the out-of-bounds read condition. The attack scenario involves:

1. The attacker crafts a malicious EMF file with manipulated header values or record structures that cause improper memory access during parsing
2. The victim opens or previews the malicious EMF file using Canva Affinity
3. The application's EMF parser reads memory beyond the allocated buffer boundaries
4. Sensitive information from adjacent memory regions may be disclosed to the attacker, or the application may crash

The vulnerability mechanism involves improper validation of EMF record data during file parsing. When the application encounters a malformed EMF structure, insufficient boundary checks allow read operations to extend beyond allocated memory regions. Technical details regarding the specific vulnerable parsing routines can be found in the Talos Intelligence Vulnerability Report.

Detection Methods for CVE-2025-58427

Indicators of Compromise

• Unexpected Canva Affinity application crashes when opening EMF files
• EMF files with anomalous header structures or record sizes received via email or downloaded from untrusted sources
• Memory access violations or segmentation faults logged during EMF file processing
• Unusual patterns of EMF file activity from unknown or suspicious sources

Detection Strategies

• Implement file integrity monitoring to detect suspicious EMF files entering the environment
• Deploy endpoint detection and response (EDR) solutions capable of monitoring application memory access patterns
• Configure application-level logging to capture EMF parsing errors and exceptions
• Utilize sandboxing technologies to safely analyze suspicious EMF files before user interaction

Monitoring Recommendations

• Monitor for unusual application crashes or memory-related exceptions in Canva Affinity processes
• Track EMF file access patterns across endpoints to identify potential exploitation attempts
• Implement network monitoring to detect suspicious EMF file transfers from untrusted sources
• Enable verbose logging for graphics processing components to capture detailed parsing information

How to Mitigate CVE-2025-58427

Immediate Actions Required

• Apply the latest security patches from Canva as soon as they become available
• Restrict handling of EMF files from untrusted sources until patches are applied
• Educate users about the risks of opening EMF files from unknown or suspicious sources
• Consider temporarily disabling or restricting EMF file processing capabilities if feasible

Patch Information

Canva has been notified of this vulnerability. Users should monitor the Canva Trust Advisory for official patch releases and security guidance. Apply all available updates to Canva Affinity as soon as they are released to address this vulnerability.

Workarounds

• Block or quarantine EMF files at email gateways and web proxies from untrusted sources
• Implement application allowlisting to prevent execution of untrusted files
• Use virtual machines or sandboxed environments when handling EMF files from unknown sources
• Configure endpoint protection solutions to scan EMF files before allowing user access

# Example: Block EMF file extensions at the email gateway level
# Add .emf to blocked attachment extensions in your email security configuration
# This reduces exposure while awaiting official patches