Security readout for executives and security teams
Plain-English summary
A malicious Substance 3D Designer file can crash the application when opened. The issue threatens availability rather than data confidentiality or integrity. Successful exploitation requires a user to open the file, limiting urgency but creating disruption risk for teams that routinely receive external design assets.
Executive priority
Schedule remediation through normal vulnerability-management timelines. Accelerate for production-critical design teams, shared workstations, or users frequently opening third-party assets. The documented risk is workflow disruption, not data theft or system takeover.
Technical view
CVE-2026-21336 is a NULL pointer dereference (CWE-476) with CVSS 3.1 score 5.5. The vector indicates local access, low complexity, no privileges, required user interaction, unchanged scope, and high availability impact. The documented outcome is application denial-of-service.
Likely exposure
Workstations running Substance 3D Designer 15.1.0 or earlier and opening untrusted files are the clearest exposure. The bundle’s affected-version metadata also mentions 15.1.2 ambiguously, so confirm the authoritative version boundary in Adobe’s advisory before closing findings.
Exploitation context
A victim must open a malicious file; remote, interaction-free compromise is not described. The cited material provides no evidence of active exploitation, and the CVE is not identified as being in KEV. No confidentiality or integrity impact is documented.
Researcher notes
The source bundle conflicts on version scope: its description says 15.1.0 and earlier, while structured affected metadata mentions 15.1.2 with an unclear default-status representation. Treat Adobe APSB26-19 as authoritative. Available evidence supports crash-only availability impact and does not establish code execution or active exploitation.
Mitigation direction
- Review Adobe advisory APSB26-19 and apply Adobe’s designated fixed release or current supported update.
- Restrict or scrutinize Substance 3D Designer files received from untrusted or external sources.
- Use established endpoint controls and user awareness procedures for externally supplied design assets.
Validation and detection
- Inventory installed Substance 3D Designer versions across relevant workstations.
- Compare detected versions with the authoritative affected and fixed ranges in Adobe APSB26-19.
- Confirm updated endpoints report the intended version and launch normally.
- Verify external design-file handling controls cover Substance 3D Designer assets.
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-2026-21336 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_designer/apsb26-19.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.