CVE-2026-21306
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedSubstance3D - Sampler versions 5.1.0 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 a malicious file.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceSubstance3D Sampler versions 5.1.0 and earlier contain an out-of-bounds write vulnerability that allows arbitrary code execution in the context of the current user. Exploitation requires a victim to open a specially crafted malicious file, making this a file-based attack vector.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 5.1.3CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Locate Adobe Substance 3D Sampler installationSearch for the Adobe Substance 3D Sampler application in your system's program list. On Windows, open Add or Remove Programs and search for 'Substance 3D Sampler'. On macOS, check the Applications folder for the application.Affected if The application is installed on the system
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Identify installed version numberView the version information for the installed Adobe Substance 3D Sampler application. On Windows, click on the application entry in Add or Remove Programs to display the version. On macOS, right-click the application and select Get Info to view the version field.Affected if A version number is displayed for the application
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Compare version against vulnerable rangeCompare the installed version number to the affected range. The vulnerability affects versions 5.1.0 and earlier. The patched version is 5.1.3.Affected if The installed version is 5.1.0 or any version earlier than 5.1.3
Your environment is affected if Adobe Substance 3D Sampler version 5.1.0 or earlier is installed and a user could open a file-based payload.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped5.1.3
Users should refrain from opening untrusted or unsolicited files and update to a version newer than 5.1.0 once Adobe releases a patch. Organizations should deploy the updated version through their patch management processes.
Adobe Substance 3D Sampler 5.1.3
- Check current Adobe Substance 3D Sampler version by opening the application and navigating to Help > About, or checking the installed version in system settings
- Download Adobe Substance 3D Sampler version 5.1.3 or later from the official Adobe website at helpx.adobe.com
- Close any running instances of Substance 3D Sampler
- Run the installer for version 5.1.3 and follow the on-screen prompts to complete the upgrade
- Restart the application after installation completes
- Verify the installed version shows 5.1.3 or later under Help > About
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-21306 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-21306 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data