CVE-2026-21298
Published: 13 January 2026
Summary
CVE-2026-21298 is a high-severity Out-of-bounds Write (CWE-787) vulnerability in Adobe Substance 3D Modeler. 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 7.4th 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 SI-16 (Memory Protection) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-21298 is an out-of-bounds write vulnerability (CWE-787) affecting Adobe Substance3D Modeler versions 1.22.4 and earlier. Published on 2026-01-13, the flaw can result in arbitrary code execution in the context of the current user when processing malformed files.
With 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), the vulnerability requires local access and user interaction, such as opening a malicious file. Attackers with no privileges can exploit it to gain high-impact control over confidentiality, integrity, and availability in the user's context, without changing scope.
Adobe Security Bulletin APSB26-08 addresses this issue; see https://helpx.adobe.com/security/products/substance3d-modeler/apsb26-08.html for mitigation guidance and patch details.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-2037
Vulnerability details
Substance3D - Modeler versions 1.22.4 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…
more
open a malicious file.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Out-of-bounds write in desktop client software enables arbitrary code execution via a malformed file opened by the user (T1204.002), directly matching exploitation of client applications (T1203).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires identification, reporting, and timely correction of flaws like the out-of-bounds write in Substance3D Modeler via patching as per Adobe bulletin APSB26-08.
Implements memory protection safeguards such as DEP and ASLR to prevent arbitrary code execution resulting from the out-of-bounds write vulnerability.
Deploys malicious code protection mechanisms to scan and block malicious files that exploit the vulnerability when opened in Substance3D Modeler.