CVE-2026-21330: Adobe After Effects RCE Vulnerability

CVE-2026-21330 Overview

CVE-2026-21330 is a Type Confusion vulnerability affecting Adobe After Effects versions 25.6 and earlier. This vulnerability allows attackers to achieve arbitrary code execution in the context of the current user by exploiting how the application handles incompatible resource types. Successful exploitation requires user interaction, specifically that a victim must open a malicious file crafted by the attacker.

Critical Impact

Successful exploitation enables arbitrary code execution, potentially allowing attackers to install malware, steal sensitive data, or gain persistent access to affected systems with the privileges of the logged-in user.

Affected Products

• Adobe After Effects versions 25.6 and earlier
• Systems running Apple macOS
• Systems running Microsoft Windows

Discovery Timeline

• 2026-02-10 - CVE-2026-21330 published to NVD
• 2026-02-11 - Last updated in NVD database

Technical Details for CVE-2026-21330

Vulnerability Analysis

This vulnerability is classified as CWE-843: Access of Resource Using Incompatible Type, commonly known as Type Confusion. Type confusion occurs when a program accesses a resource using a type that is incompatible with the resource's actual type, leading to undefined behavior. In the context of Adobe After Effects, this manifests when the application processes specially crafted project files or media assets.

The local attack vector means the attacker must either have direct access to the target system or must convince a user to open a malicious file delivered through social engineering methods such as phishing emails or compromised download sites. Once a user opens the malicious file, the type confusion vulnerability is triggered, allowing the attacker to execute arbitrary code with the privileges of the current user.

Root Cause

The root cause lies in improper type handling within Adobe After Effects' file parsing routines. When processing certain data structures, the application fails to properly validate or cast object types before accessing them. This allows an attacker to craft a file that causes the application to interpret data as an incompatible type, leading to memory corruption and ultimately arbitrary code execution.

Attack Vector

The attack requires local access to deliver the malicious file to the victim. The typical attack scenario involves:

1. An attacker crafts a malicious After Effects project file (.aep) or media asset containing specially structured data designed to trigger the type confusion
2. The attacker delivers this file to the victim via email attachment, file sharing service, or compromised website
3. The victim opens the malicious file in Adobe After Effects
4. The type confusion vulnerability is triggered, allowing arbitrary code execution in the user's context

The vulnerability can be exploited through maliciously crafted project files that manipulate object type information. When After Effects parses these files, the incorrect type interpretation leads to memory access violations that can be leveraged for code execution. For detailed technical information, refer to the Adobe After Effects Security Advisory.

Detection Methods for CVE-2026-21330

Indicators of Compromise

• Unusual After Effects process behavior, including unexpected child processes or network connections
• Crash logs indicating type confusion or memory access violations in After Effects
• Suspicious .aep or media files received via email or downloaded from untrusted sources
• Unexpected file system or registry modifications following After Effects execution

Detection Strategies

• Monitor for After Effects processes spawning unexpected child processes, particularly command shells or scripting interpreters
• Deploy endpoint detection rules to identify anomalous memory access patterns in AfterFX.exe processes
• Implement email gateway scanning for potentially malicious After Effects project files
• Use application whitelisting to prevent unauthorized code execution from the After Effects directory

Monitoring Recommendations

• Enable verbose logging for Adobe Creative Cloud applications to capture potential exploitation attempts
• Configure SIEM rules to alert on After Effects crash events that may indicate exploitation
• Monitor network traffic from After Effects processes for suspicious outbound connections
• Implement file integrity monitoring on Adobe After Effects installation directories

How to Mitigate CVE-2026-21330

Immediate Actions Required

• Update Adobe After Effects to the latest patched version as specified in Adobe's security bulletin
• Avoid opening After Effects project files from untrusted or unknown sources
• Implement application sandboxing where possible to limit the impact of potential exploitation
• Ensure endpoint protection solutions are updated to detect and block exploitation attempts

Patch Information

Adobe has released a security update addressing this vulnerability. Refer to the Adobe After Effects Security Advisory (APSB26-15) for detailed patch information and download links. Users should update to version 25.7 or later to remediate this vulnerability.

Workarounds

• Restrict file associations for After Effects project files to prevent automatic opening
• Enable User Account Control (UAC) on Windows systems to limit the impact of code execution
• Configure After Effects to run with reduced privileges where operationally feasible
• Implement strict email filtering policies to block potentially malicious media and project files

# Example: Restrict After Effects file execution on Windows using AppLocker
# Create a rule to prevent execution from user-writable directories
New-AppLockerPolicy -RuleType Publisher -User Everyone -Deny -Xml |
  Out-File -FilePath "C:\Policies\AfterEffectsRestriction.xml"