CVE-2026-21322: Adobe After Effects RCE Vulnerability

CVE-2026-21322 Overview

CVE-2026-21322 is an out-of-bounds read vulnerability affecting Adobe After Effects versions 25.6 and earlier. The flaw exists in the file parsing functionality, where a specially crafted file can trigger a read past the end of an allocated memory structure. Successful exploitation enables an attacker to execute arbitrary code in the context of the current user, potentially leading to full system compromise.

Critical Impact

An attacker could execute arbitrary code in the context of the current user by tricking a victim into opening a malicious file, potentially leading to data theft, malware installation, or lateral movement within an organization.

Affected Products

• Adobe After Effects versions 25.6 and earlier
• Apple macOS (all supported versions running vulnerable After Effects)
• Microsoft Windows (all supported versions running vulnerable After Effects)

Discovery Timeline

• 2026-02-10 - CVE-2026-21322 published to NVD
• 2026-02-11 - Last updated in NVD database

Technical Details for CVE-2026-21322

Vulnerability Analysis

This vulnerability is classified as CWE-125 (Out-of-Bounds Read), a memory corruption flaw that occurs when software reads data past the boundaries of an allocated buffer. In the context of Adobe After Effects, the vulnerability is triggered during file parsing operations when the application processes specially crafted project files or media assets.

The out-of-bounds read condition can expose sensitive memory contents and, more critically, can be leveraged as a primitive for achieving code execution. The local attack vector means exploitation requires user interaction—specifically, the victim must open a malicious file. However, creative professionals frequently receive project files from external sources, making phishing and social engineering attacks viable delivery mechanisms.

Root Cause

The root cause lies in insufficient bounds checking during file parsing operations within Adobe After Effects. When processing certain file structures, the application fails to properly validate data length or offset values before reading from memory. This allows an attacker to craft a file that causes the application to read beyond the intended memory boundaries.

This type of vulnerability typically arises from improper handling of untrusted input data, where file format fields specifying sizes or offsets are not adequately validated against actual buffer allocations.

Attack Vector

The attack requires local access through user interaction. An attacker must craft a malicious After Effects project file (.aep) or supported media file containing specially crafted data designed to trigger the out-of-bounds read. The attack sequence involves:

1. Attacker creates a malicious file with crafted data structures
2. Victim receives the file via email, file sharing, or download
3. Victim opens the file in Adobe After Effects
4. The vulnerable parsing routine processes the malicious data
5. Out-of-bounds memory read occurs, enabling code execution in the user's context

The vulnerability is particularly concerning in creative industry workflows where sharing project files between teams, clients, and vendors is routine practice.

Detection Methods for CVE-2026-21322

Indicators of Compromise

• Unexpected crashes or abnormal termination of Adobe After Effects when opening project files
• Memory access violations or segmentation faults in After Effects processes
• Suspicious After Effects project files (.aep) received from unknown or untrusted sources
• Anomalous child process creation spawned from AfterFX.exe or After Effects application processes

Detection Strategies

• Deploy endpoint detection rules to monitor Adobe After Effects for abnormal memory access patterns
• Implement file integrity monitoring for incoming project files before they reach end users
• Configure application-level sandboxing to detect and block exploitation attempts
• Enable crash dump collection and analysis for After Effects to identify potential exploitation

Monitoring Recommendations

• Monitor network traffic for unusual downloads of After Effects project files from untrusted domains
• Track file creation events for After Effects project files in user download directories
• Implement user behavior analytics to detect anomalous file access patterns in creative workflows
• Enable application crash reporting and correlate with security events

How to Mitigate CVE-2026-21322

Immediate Actions Required

• Update Adobe After Effects to the latest patched version immediately
• Restrict opening of After Effects project files from untrusted or unknown sources
• Enable Protected View or sandboxing features if available in your environment
• Educate creative teams about the risks of opening project files from external sources

Patch Information

Adobe has released a security update addressing this vulnerability. Organizations should apply the patch as documented in the Adobe After Effects Security Advisory (APSB26-15). The patch resolves the out-of-bounds read condition by implementing proper bounds validation during file parsing operations.

Administrators should prioritize patching systems where After Effects is installed, particularly in environments where users regularly process files from external sources.

Workarounds

• Implement email filtering to scan and quarantine After Effects project files before delivery to users
• Deploy application control policies to prevent execution of After Effects from non-standard directories
• Consider using virtual machines or isolated environments for processing untrusted project files
• Temporarily disable or restrict After Effects usage until patches can be applied in high-risk environments

# Configuration example for restricting file associations (Windows)
# Block After Effects file associations from auto-opening untrusted files
# Requires Group Policy or registry modification

# Disable auto-play for removable media containing project files
reg add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoDriveTypeAutoRun /t REG_DWORD /d 255 /f

# Configure Windows Defender Application Control to monitor After Effects
# See Microsoft documentation for WDAC policy configuration