CVE-2026-21351: 
Adobe After Effects vulnerability analysis and mitigation

CVE-2026-21351 is a Use After Free (CWE-416) vulnerability in Adobe After Effects that allows arbitrary code execution. It affects Adobe After Effects versions prior to 25.6.4 and was disclosed on February 10, 2026, with a patch released the same day. The vulnerability carries a CVSS v3.1 base score of 7.8 (High), requiring local access and user interaction to exploit (Adobe Advisory).

The vulnerability is classified as CWE-416 (Use After Free), a memory corruption flaw where a program continues to use a pointer after the memory it references has been freed. Exploitation requires a local attacker to craft a malicious After Effects project file and convince a victim to open it, triggering the use-after-free condition during file parsing. The attack vector is local (AV:L), requires no privileges (PR:N), but does require user interaction (UI:R), meaning the victim must open a specially crafted file (Adobe Advisory).

Successful exploitation allows an unauthenticated local attacker to execute arbitrary code with the privileges of the Adobe After Effects process, potentially enabling full system compromise. This includes the ability to read or modify files, execute commands, and perform other unauthorized actions within the scope of the affected user's privileges. All three security pillars — confidentiality, integrity, and availability — are rated HIGH impact (Adobe Advisory).

1. Craft malicious file: An attacker creates a specially crafted Adobe After Effects project file designed to trigger a use-after-free memory corruption condition during parsing.
2. Social engineering: The attacker delivers the malicious file to a target user via email, file sharing, or other means, and convinces them to open it with Adobe After Effects.
3. Trigger vulnerability: When the victim opens the file, After Effects processes it and triggers the use-after-free condition, corrupting memory in a controlled manner.
4. Achieve code execution: The attacker leverages the memory corruption to redirect execution flow and run arbitrary code with the privileges of the After Effects process on the victim's system (Adobe Advisory).

• File System: Unexpected or suspicious .aep (After Effects Project) files received from unknown or untrusted sources; new or modified files in user directories following After Effects usage.
• Process: Unusual child processes spawned by the Adobe After Effects process (e.g., cmd.exe, powershell.exe, bash, curl, or other shells/utilities not normally associated with After Effects).
• Logs: Application crash logs or Windows Event Logs indicating abnormal termination or memory access violations in the After Effects process around the time of file opening.

Adobe has released a patch in After Effects version 25.6.4, which addresses this vulnerability. Users should update to version 25.6.4 or later immediately via the Creative Cloud desktop application. As a temporary workaround until patching is possible, organizations should restrict users from opening After Effects project files from untrusted or unknown sources, and educate users about the risks of opening unsolicited media files (Adobe Advisory, CIS Advisory).

The Center for Internet Security (CIS) issued an advisory noting that multiple vulnerabilities in Adobe products, including this one, could allow for arbitrary code execution, recommending prompt patching (CIS Advisory). Tenable published detection plugins for this vulnerability shortly after disclosure. Community and media reaction has been routine, consistent with Adobe's regular Patch Tuesday-style security update cycle, with no notable controversy or elevated concern beyond standard patch guidance.