CVE-2025-66633 is a medium-severity vulnerability classified under CWE-125 (Out-of-bounds Read) affecting Canva Affinity version 3.0.1.3808. The flaw exists in the Enhanced Metafile (EMF) processing functionality, where the software improperly handles specially crafted EMF files, leading to out-of-bounds memory reads. This vulnerability allows an attacker to read memory locations beyond the intended buffer, potentially exposing sensitive information such as user data, cryptographic keys, or other confidential content residing in memory. Exploitation requires the victim to open or process a malicious EMF file locally, with no need for elevated privileges, but user interaction is necessary. The CVSS v3.1 base score is 6.1, reflecting a local attack vector (AV:L), low attack complexity (AC:L), no privileges required (PR:N), and user interaction required (UI:R). The impact on confidentiality is high (C:H), while integrity is not affected (I:N), and availability impact is low (A:L). Currently, there are no known public exploits or patches available, indicating that the vulnerability is newly disclosed and not yet actively exploited. The vulnerability's root cause is improper bounds checking during EMF file parsing, a common issue in handling complex file formats. This flaw could be leveraged by attackers to gather sensitive information from memory, which may aid in further attacks or data breaches.

The primary impact of CVE-2025-66633 is the potential disclosure of sensitive information from the memory space of the Canva Affinity application. This can lead to leakage of confidential user data, session tokens, or other sensitive information that resides in memory during application runtime. Although the vulnerability does not allow code execution or integrity modification, the confidentiality breach can have serious consequences, especially in environments handling sensitive or proprietary design data. The requirement for local access and user interaction limits the scope of exploitation, reducing the risk of widespread remote attacks. However, in environments where users frequently exchange EMF files or open files from untrusted sources, the risk increases. The vulnerability could be used as a stepping stone for more advanced attacks if combined with other vulnerabilities or social engineering tactics. Organizations relying on Canva Affinity for design and creative workflows may face data confidentiality risks, potentially impacting intellectual property protection and compliance with data privacy regulations.

To mitigate CVE-2025-66633, organizations should implement the following specific measures: 1) Restrict the opening and processing of EMF files from untrusted or unknown sources within Canva Affinity until a vendor patch is released. 2) Employ application whitelisting and file type filtering to prevent unauthorized or suspicious EMF files from being opened. 3) Use endpoint security solutions that monitor and block anomalous file parsing behaviors indicative of out-of-bounds reads. 4) Educate users about the risks of opening unsolicited or suspicious EMF files and enforce strict policies on file sharing. 5) Monitor vendor communications closely and apply security patches or updates promptly once available. 6) Consider sandboxing or running Canva Affinity in isolated environments to limit the impact of potential memory disclosure. 7) Implement memory protection mechanisms such as Address Space Layout Randomization (ASLR) and Data Execution Prevention (DEP) to reduce exploitation success. 8) Conduct regular security assessments and code audits focusing on file parsing components to identify and remediate similar vulnerabilities proactively.