Security readout for executives and security teams
Plain-English summary
A malicious Substance 3D Modeler file can crash the application when opened. The issue can disrupt an individual user’s work but is not reported to expose or alter data. Because exploitation requires the victim to open a crafted file, organizations handling externally supplied 3D assets face the greatest risk.
Executive priority
Treat this as a normal-priority endpoint remediation, accelerated for design teams handling untrusted files. The impact is operational disruption rather than disclosed compromise. Confirm ownership, inventory affected installations, and update them without delaying higher-severity remote-code-execution or actively exploited vulnerabilities.
Technical view
CVE-2026-21300 is a NULL pointer dereference (CWE-476) affecting Adobe Substance 3D Modeler 1.22.4 and earlier. A crafted file can trigger application denial-of-service. CVSS 3.1 is 5.5: local attack vector, low complexity, no privileges, required user interaction, high availability impact, and no stated confidentiality or integrity impact.
Likely exposure
Exposure is concentrated on endpoints running Substance 3D Modeler 1.22.4 or earlier, particularly where users open models from clients, collaborators, downloads, or other untrusted sources. The supplied evidence does not indicate remote, unattended, or server-side exploitation.
Exploitation context
A victim must open a malicious file. The supplied bundle reports no CISA KEV listing and provides no evidence of active exploitation. Successful exploitation is described as an application crash, not code execution, data theft, or data modification.
Researcher notes
The stated failure class is CWE-476 with availability-only impact. The narrative identifies 1.22.4 and earlier as affected; the structured version data is terse but indicates 1.22.5 as the apparent fixed boundary. No crash mechanics, proof of concept, exploitation telemetry, or additional mitigations are supplied.
Mitigation direction
- Update affected installations to version 1.22.5 or later after confirming Adobe’s advisory and deployment guidance.
- Prioritize users who routinely receive or download externally supplied Substance 3D files.
- Restrict opening untrusted files until affected installations are updated.
- Use approved file-transfer and content-review processes for externally sourced 3D assets.
Validation and detection
- Inventory installed Substance 3D Modeler versions across managed endpoints.
- Identify installations running version 1.22.4 or earlier.
- Confirm updated endpoints report version 1.22.5 or later.
- Review application crash telemetry for incidents involving externally sourced files.
- Verify file-handling guidance reaches teams exchanging 3D assets with outside parties.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-476: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-21300 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H1.83.6adobeVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://helpx.adobe.com/security/products/substance3d-modeler/apsb26-08.htmlCVE reference, adobe · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.