CVE-2026-21320: 
Adobe After Effects vulnerability analysis and mitigation

CVE-2026-21320 is a Use After Free vulnerability in Adobe After Effects that could allow arbitrary code execution in the context of the current user. It affects After Effects versions 25.6 and earlier (specifically, all versions prior to 25.6.4). Adobe disclosed and patched this vulnerability on February 10, 2026, as part of their February 2026 security update cycle. It carries a CVSS v3.1 base score of 7.8 (High) (Adobe Advisory, Feedly).

The vulnerability is classified as CWE-416 (Use After Free), meaning the application references memory after it has been freed, potentially leading to memory corruption and code execution. The attack vector is local — an attacker must deliver a specially crafted file to the victim, who must then open it in Adobe After Effects. No privileges are required on the part of the attacker, but user interaction is a prerequisite. No public technical write-ups or proof-of-concept code have been identified at this time (Adobe Advisory, Feedly).

Successful exploitation allows an attacker to execute arbitrary code in the context of the currently logged-in user, resulting in high confidentiality, integrity, and availability impact on the affected system. An attacker could leverage code execution to access sensitive project files, install malware, or pivot to other systems accessible by the victim user. The scope is limited to the local system running the vulnerable After Effects installation (Adobe Advisory).

1. Craft a malicious file: An attacker creates a specially crafted After Effects project file (e.g., .aep) designed to trigger a use-after-free condition in vulnerable versions (≤25.6).
2. Deliver the file: The attacker distributes the malicious file via phishing email, file-sharing platform, or other social engineering means targeting After Effects users.
3. Victim opens the file: The victim opens the malicious file in Adobe After Effects version 25.6 or earlier, triggering the use-after-free memory corruption.
4. Achieve code execution: The memory corruption is leveraged to redirect execution flow, resulting in arbitrary code execution in the context of the current user — potentially enabling malware installation, data theft, or further lateral movement (Adobe Advisory).

• File System: Unexpected files dropped in user temp directories or After Effects working directories following the opening of an untrusted .aep or related project file.
• Process: Unusual child processes spawned by the After Effects process (e.g., cmd.exe, powershell.exe, curl, or scripting interpreters) that are not part of normal application behavior.
• Network: Unexpected outbound network connections originating from the After Effects process to unknown external IP addresses or domains shortly after opening a project file.
• Logs: Application crash logs or Windows Event Logs indicating memory access violations or abnormal termination of the After Effects process around the time a suspicious file was opened.

Adobe has released After Effects version 25.6.4 to address this vulnerability; users should update immediately via the Creative Cloud desktop application or Adobe's official download channels (Adobe Advisory). As a workaround, users should avoid opening After Effects project files received from untrusted or unknown sources. Organizations should implement user awareness training around phishing and malicious file delivery, and consider restricting automatic file-opening features where feasible (CIS Advisory).

The vulnerability was covered as part of Adobe's broader February 2026 patch release, which addressed multiple products. The Center for Internet Security (CIS) issued an advisory noting that multiple Adobe vulnerabilities patched in this cycle could allow arbitrary code execution (CIS Advisory). Tenable published detection plugins for the vulnerability (Tenable). No notable independent researcher commentary or significant social media discussion has been identified beyond routine patch tracking.