CVE-2026-34708
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 · uneditedInCopy versions 21.3, 20.5.3 and earlier are affected by a Stack-based Buffer Overflow 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 · high confidenceAdobe InCopy versions 21.3, 20.5.3 and earlier contain a stack-based buffer overflow vulnerability that can be triggered when a victim opens a specially crafted malicious file, leading to arbitrary code execution in the context of the current user's privileges.
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< 20.5.4>= 21.0, < 21.4CVSS 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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Verify Adobe InCopy is installedCheck for InCopy installation using system inventory tools, registry queries, or by locating InCopy application files in standard Adobe installation directoriesAffected if InCopy software is present on the system
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Identify installed InCopy versionRetrieve the version number of the InCopy executable using system information utilities, software inventory tools, or by checking file properties of the main InCopy application fileAffected if Version cannot be determined or InCopy is not found
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Compare version against affected rangesCross-reference the identified version against: versions prior to 20.5.4, OR versions 21.0 through 21.3.x (anything >= 21.0 but < 21.4)Affected if Installed version falls within < 20.5.4 OR >= 21.0 and < 21.4, placing the system within the vulnerable range
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Assess user file handling behaviorDetermine if users in the environment routinely open files from untrusted or unknown sources, as exploitation requires a victim to open a specially crafted malicious fileAffected if Users regularly open untrusted or unexpected InCopy files
A system is affected if Adobe InCopy is installed with a version number less than 20.5.4 or between 21.0 and 21.3.x inclusive, and users may open untrusted files.
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 · scoped20.5.421.4
Update InCopy to the latest patched version provided by Adobe. Avoid opening files from untrusted or unknown sources.
InCopy 20.5.4 (for 20.x branch) or InCopy 21.4+ (for 21.x branch)
- 1. Close any running instances of Adobe InCopy
- 2. Navigate to the official Adobe website at helpx.adobe.com or use Adobe Creative Cloud desktop application
- 3. Download InCopy version 20.5.4 (if currently on 20.x branch) or version 21.4 or later (if currently on 21.x branch)
- 4. Run the installer and follow the on-screen prompts to complete the installation
- 5. After installation, verify the version by opening InCopy and checking Help > About InCopy
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation1.0 h
- Testing1.0 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 $1,200.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-34708 — 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-2026-34708 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