Security readout for executives and security teams
Plain-English summary
A malicious file opened in Adobe Substance 3D Painter could expose sensitive information from the application's memory. The victim must open the file, limiting immediate risk, but exposed memory could contain confidential project or session data.
Executive priority
Prioritize routine remediation on creative workstations handling external files or sensitive projects. This is not an emergency based on supplied evidence, but confidentiality exposure justifies timely updating and temporary file-handling controls.
Technical view
CVE-2026-21365 is an out-of-bounds read (CWE-125) in Substance 3D Painter 11.1.2 and earlier. It has CVSS 3.1 score 5.5 and affects confidentiality only; no integrity or availability impact is identified. Exploitation requires local file delivery and user interaction.
Likely exposure
Workstations running Substance 3D Painter 11.1.2 or earlier are potentially exposed, particularly where users receive project files from external or untrusted sources. The supplied structured version data is ambiguous, so inventories should be compared with Adobe's advisory.
Exploitation context
The bundle provides no evidence of active exploitation, and the CVE is not listed as KEV. An unauthenticated attacker must persuade a user to open a malicious file. Successful exploitation could disclose sensitive process memory but is not reported to alter data or disrupt service.
Researcher notes
The stated vector is CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N. The narrative identifies 11.1.2 and earlier, while the structured affected entry includes values "0" and "11.1.3" without range semantics. Confirm boundaries and the corrected release through Adobe. No exploit method or observed exploitation is supplied.
Mitigation direction
- Review Adobe advisory APSB26-25 for the supported corrected release and vendor instructions.
- Update affected Substance 3D Painter installations according to Adobe guidance.
- Restrict opening Painter files received from unknown or unverified sources.
- Use attachment filtering and user awareness controls until affected installations are remediated.
Validation and detection
- Inventory installed Substance 3D Painter versions across managed endpoints.
- Identify installations running version 11.1.2 or earlier.
- Confirm installed versions against the exact affected range in Adobe APSB26-25.
- Verify remediation through endpoint inventory or software-management reporting.
- Review security telemetry for suspicious Painter file activity; absence does not prove safety.
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-125: 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-2026-21365 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:H/I:N/A:N
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:H/I:N/A:N1.83.6adobeVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
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_painter/apsb26-25.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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.