CVE-2026-21327
Published: 10 February 2026
Summary
CVE-2026-21327 is a high-severity Out-of-bounds Write (CWE-787) vulnerability in Adobe After Effects. Its CVSS base score is 7.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked at the 2.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 RA-5 (Vulnerability Monitoring and Scanning) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Flaw remediation directly prevents exploitation of the out-of-bounds write vulnerability in After Effects by requiring timely application of vendor patches like those in Adobe APSB26-15.
Vulnerability scanning identifies systems running vulnerable After Effects versions affected by CVE-2026-21327 prior to exploitation via malicious file opens.
Memory protection mechanisms such as DEP and ASLR mitigate arbitrary code execution from the out-of-bounds write even on unpatched systems.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Out-of-bounds write enables client-side arbitrary code execution upon opening a malicious file (T1203 + T1204.002).
NVD Description
After Effects versions 25.6 and earlier are affected by an out-of-bounds write vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open…
more
a malicious file.
Deeper analysisAI
CVE-2026-21327 is an out-of-bounds write vulnerability (CWE-787) affecting Adobe After Effects versions 25.6 and earlier. Published on 2026-02-10, it could result in arbitrary code execution in the context of the current user when exploited.
The vulnerability has a CVSS v3.1 base score of 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), indicating local attack vector, low attack complexity, no required privileges, and user interaction. An attacker can exploit it by tricking a victim into opening a malicious file, achieving high-impact confidentiality, integrity, and availability violations through arbitrary code execution as the current user.
Adobe's security bulletin APSB26-15, available at https://helpx.adobe.com/security/products/after_effects/apsb26-15.html, details patches and mitigation recommendations for addressing this issue.
Details
- CWE(s)