CVE-2026-21324
📋 TL;DR
CVE-2026-21324 is an out-of-bounds read vulnerability in Adobe After Effects that could allow an attacker to execute arbitrary code in the context of the current user. This affects users of After Effects versions 25.6 and earlier who open malicious files. Successful exploitation requires user interaction through opening a crafted file.
💻 Affected Systems
- Adobe After Effects
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining the same privileges as the current user, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Local code execution allowing malware installation, credential theft, or persistence mechanisms on the affected workstation.
If Mitigated
Limited impact with proper application sandboxing and user privilege restrictions, potentially resulting in application crash rather than code execution.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file) and crafting a file that triggers the out-of-bounds read condition.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 25.7 or later
Vendor Advisory: https://helpx.adobe.com/security/products/after_effects/apsb26-15.html
Restart Required: Yes
Instructions:
1. Open Adobe Creative Cloud application. 2. Navigate to 'Apps' section. 3. Find After Effects and click 'Update'. 4. Install version 25.7 or later. 5. Restart After Effects after installation.
🔧 Temporary Workarounds
Restrict file opening
allConfigure application to only open trusted files or implement file type restrictions
Run with reduced privileges
windowsRun After Effects with limited user privileges to reduce impact of successful exploitation
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized code
- Use email/web filtering to block malicious file attachments and downloads
🔍 How to Verify
Check if Vulnerable:
Check After Effects version via Help > About After Effects. If version is 25.6 or earlier, system is vulnerable.Check Version:
On Windows: wmic product where name="Adobe After Effects" get version
On macOS: /Applications/Adobe\ After\ Effects\ */Adobe\ After\ Effects.app/Contents/Info.plist | grep -A1 CFBundleShortVersionStringVerify Fix Applied:
Verify After Effects version is 25.7 or later via Help > About After Effects.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unexpected file opening events in After Effects
Network Indicators:
- Unusual outbound connections from After Effects process
SIEM Query:
process_name:"AfterFX.exe" AND (event_type:crash OR file_path:*.aep OR file_path:*.aet)