CVE-2026-21324: 
Adobe After Effects vulnerability analysis and mitigation

CVE-2026-21324 is an out-of-bounds read vulnerability in Adobe After Effects that can result in arbitrary code execution when a victim opens a maliciously crafted file. It affects After Effects versions 25.6 and earlier (all versions prior to 25.6.4). Adobe disclosed and patched this vulnerability on February 10, 2026, via security advisory APSB26-15. It carries a CVSS v3.1 base score of 7.8 (High) (Adobe Advisory).

The vulnerability is classified as CWE-125 (Out-of-bounds Read), triggered during the parsing of a specially crafted project file. When After Effects processes the malicious file, it reads past the end of an allocated memory structure, which an attacker can leverage to achieve code execution in the context of the current user. Exploitation requires local delivery of the malicious file and user interaction — specifically, the victim must open the crafted file. No privileges are required on the part of the attacker (Adobe Advisory).

Successful exploitation allows an unauthenticated attacker to execute arbitrary code with the privileges of the current user, resulting in high confidentiality, integrity, and availability impact on the affected system. An attacker who achieves code execution could access sensitive project files, install malware, or use the compromised workstation as a pivot point for lateral movement within a network. The scope is limited to the local system context of the victim user (Adobe Advisory).

1. Craft malicious file: Create a specially crafted Adobe After Effects project file (e.g., .aep) that triggers an out-of-bounds read during file parsing, potentially enabling control over program execution flow.
2. Deliver the file: Distribute the malicious file to the target via phishing email, malicious download link, shared network drive, or other social engineering vector.
3. User interaction: Convince the victim to open the crafted file using a vulnerable version of Adobe After Effects (25.6 or earlier).
4. Trigger vulnerability: Upon opening, After Effects parses the file and reads past the end of an allocated memory buffer (CWE-125), which the attacker leverages to redirect execution.
5. Achieve code execution: Arbitrary code executes in the context of the current user, enabling the attacker to install payloads, exfiltrate data, or establish persistence (Adobe Advisory).

• File System: Unexpected or newly created files in After Effects project directories or temp folders; suspicious .aep or related project files received from unknown sources.
• Process: Unusual child processes spawned by the After Effects process (e.g., cmd.exe, powershell.exe, curl, wget) following the opening of a project file.
• Network: Unexpected outbound network connections originating from the After Effects process to unknown external IP addresses or domains shortly after file open events.
• Logs: Application crash logs or error reports from After Effects referencing memory access violations or out-of-bounds read errors around file parsing operations.

Adobe has released After Effects version 25.6.4 to address this vulnerability, and users should update immediately via the Creative Cloud desktop application or Adobe's official download channels. As a precautionary measure, users should avoid opening After Effects project files received from untrusted or unknown sources, particularly those delivered via email or downloaded from suspicious websites. No alternative workaround is documented; patching to 25.6.4 or later is the recommended remediation (Adobe Advisory).

The CIS (Center for Internet Security) issued an advisory noting that multiple Adobe vulnerabilities disclosed in February 2026, including this one, could allow for arbitrary code execution, recommending prompt patching (CIS Advisory). Tenable published detection plugins for this vulnerability shortly after disclosure. General community reaction has been measured given the absence of public exploits or active exploitation.