CVE-2025-66503 is a medium-severity vulnerability classified as CWE-125 (Out-of-bounds Read) found in the EMF (Enhanced Metafile) processing component of Canva Affinity version 3.0.1.3808. The flaw arises when the software processes specially crafted EMF files that cause it to read memory outside the intended buffer boundaries. This out-of-bounds read can lead to the disclosure of sensitive information residing in adjacent memory areas, potentially exposing confidential data to an attacker. The vulnerability requires local access to the system and user interaction, as the victim must open or import the malicious EMF file into Canva Affinity. The CVSS 3.1 vector indicates low attack complexity and no privileges required, but user interaction is mandatory. The impact is primarily on confidentiality, with no direct effect on integrity or significant availability degradation. No patches are currently linked, and no exploits have been observed in the wild, but the vulnerability is publicly disclosed and should be addressed proactively. The vulnerability underscores the risks associated with processing complex file formats like EMF without sufficient bounds checking and input validation.

The primary impact of CVE-2025-66503 is the potential unauthorized disclosure of sensitive information from the memory of systems running Canva Affinity 3.0.1.3808. This could include confidential user data or application memory contents that may aid further attacks or data leakage. Since the attack requires local access and user interaction, the risk is somewhat limited to targeted attacks or scenarios where attackers can trick users into opening malicious files. However, organizations relying heavily on Canva Affinity for design work, especially those handling sensitive or proprietary information, could face data confidentiality breaches. The vulnerability does not affect system integrity or availability significantly, so it is less likely to cause system crashes or data corruption. The absence of known exploits reduces immediate risk, but the public disclosure means attackers could develop exploits in the future. Overall, the threat is moderate but relevant for environments where sensitive design files or intellectual property are processed.

To mitigate CVE-2025-66503, organizations should implement the following specific measures: 1) Avoid opening EMF files from untrusted or unknown sources in Canva Affinity until a patch is released. 2) Employ strict file validation and sandboxing techniques when handling EMF files to limit potential memory exposure. 3) Monitor and restrict local user privileges to reduce the risk of malicious file execution. 4) Educate users about the risks of opening unsolicited or suspicious graphic files, emphasizing cautious handling of EMF files. 5) Use endpoint protection solutions capable of detecting anomalous behavior related to file parsing. 6) Regularly check for updates from Canva and apply security patches promptly once available. 7) Consider network segmentation to isolate design workstations from sensitive data repositories to limit lateral movement if exploitation occurs. These targeted steps go beyond generic advice by focusing on the specific vector and file type involved in this vulnerability.