CVE-2026-21328 is an out-of-bounds write vulnerability classified under CWE-787 affecting Adobe After Effects versions 25.6 and earlier. This vulnerability arises when the software improperly handles memory bounds during file processing, allowing an attacker to write data outside the intended buffer. Such memory corruption can lead to arbitrary code execution within the context of the current user. Exploitation requires that a victim opens a maliciously crafted After Effects project or file, making user interaction mandatory. The vulnerability does not require any prior authentication, increasing its risk profile. The CVSS v3.1 score of 7.8 indicates high severity, with attack vector local (AV:L), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), and high impact on confidentiality, integrity, and availability (C:H/I:H/A:H). No patches or known exploits are currently available, but the vulnerability poses a significant threat due to the potential for arbitrary code execution, which could lead to system compromise, data theft, or disruption of services. Adobe After Effects is widely used in media production, advertising, and digital content creation, making this vulnerability particularly relevant to organizations in these sectors.

The vulnerability allows attackers to execute arbitrary code with the same privileges as the user running After Effects, potentially leading to full system compromise if the user has administrative rights. Confidentiality is at risk as attackers could access sensitive project files and data. Integrity could be compromised by altering project files or injecting malicious code. Availability might be affected if the exploit causes application crashes or system instability. Since exploitation requires user interaction, social engineering or phishing campaigns could be used to trick users into opening malicious files. The widespread use of Adobe After Effects in creative industries means that many organizations globally could be targeted, especially those handling sensitive media content or intellectual property. The lack of patches increases the window of exposure, and the absence of known exploits in the wild suggests this is an emerging threat that could be weaponized soon.

Until Adobe releases an official patch, organizations should implement strict controls on file sources, only opening After Effects files from trusted and verified origins. Employ email and web filtering to block or flag suspicious attachments and downloads. Educate users about the risks of opening unsolicited or unexpected project files, emphasizing caution with files received via email or file-sharing platforms. Use endpoint protection solutions capable of detecting anomalous behavior related to After Effects processes. Apply the principle of least privilege by running After Effects with the minimum necessary user rights to limit the impact of potential exploitation. Monitor system and application logs for unusual activity indicative of exploitation attempts. Consider isolating systems used for After Effects projects from critical network segments to reduce lateral movement risk. Stay alert for Adobe’s security advisories and apply patches immediately upon release.