CVE-2026-21324 is an out-of-bounds read vulnerability classified under CWE-125 affecting Adobe After Effects versions 25.6 and earlier. The vulnerability arises during the parsing of a crafted file, where the software reads memory beyond the allocated buffer boundaries. This memory corruption can lead to arbitrary code execution within the context of the current user, potentially allowing attackers to compromise system confidentiality, integrity, and availability. The attack vector requires local access and user interaction, as the victim must open a malicious file designed to trigger the flaw. The CVSS v3.1 base score is 7.8, reflecting high severity due to the potential for full compromise without requiring privileges or complex attack conditions. Although no public exploits are known at this time, the vulnerability poses a significant risk to users of After Effects, especially in environments where untrusted files may be received or shared. The lack of an official patch at the time of reporting necessitates immediate mitigation efforts to reduce exposure. This vulnerability highlights the risks inherent in processing complex media files and the importance of robust input validation and memory management in software development.

The vulnerability allows attackers to execute arbitrary code with the privileges of the current user, potentially leading to full system compromise. This can result in unauthorized access to sensitive project files, intellectual property theft, disruption of media production workflows, and installation of persistent malware. Since After Effects is widely used in creative industries, exploitation could impact media companies, advertising agencies, and content creators, causing operational downtime and financial losses. The requirement for user interaction limits mass exploitation but targeted attacks via spear-phishing or malicious file distribution remain a significant threat. The flaw affects confidentiality by exposing memory contents, integrity by enabling code execution, and availability by potentially crashing the application or system. Organizations relying on Adobe After Effects face risks to their creative assets and operational continuity until the vulnerability is remediated.

Until an official patch is released, organizations should implement strict file handling policies, including disabling the opening of After Effects project files from untrusted or unknown sources. Employ sandboxing or application isolation techniques to limit the impact of potential exploitation. Use endpoint protection solutions capable of detecting anomalous behaviors associated with code execution attempts from After Effects. Educate users about the risks of opening unsolicited or suspicious files, emphasizing cautious handling of email attachments and downloads. Monitor network and endpoint logs for unusual activity related to After Effects processes. Once Adobe releases a patch, prioritize immediate deployment across all affected systems. Additionally, consider implementing application whitelisting to prevent unauthorized code execution and maintain up-to-date backups of critical project data to enable recovery in case of compromise.