CVE-2023-42056
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 · uneditedPDF-XChange Editor U3D File Parsing Uninitialized Variable Information Disclosure Vulnerability. This vulnerability allows remote attackers to disclose sensitive information on affected installations of PDF-XChange Editor. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of U3D files. The issue results from the lack of proper initialization of memory prior to accessing it. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current process. Was ZDI-CAN-20929.
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 confidencePDF-XChange Editor contains an uninitialized variable vulnerability in its U3D (Universal 3D) file parsing logic. The parser fails to properly initialize memory before accessing it, leading to information disclosure. While the primary impact is disclosure of sensitive information from uninitialized memory, the advisory notes this can be chained with other vulnerabilities to achieve arbitrary code execution in the context of the current process.
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= 9.5.368.0= 9.5.368.0CVSS 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
- None
- Availability
- None
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
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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Identify installed PDF-XChange productsOpen Windows Settings > Apps > Apps & features (or use 'appwiz.cpl' in Run), locate PDF-XChange Editor or PDF-XChange PDF Tools, and note the exact version number displayedAffected if The installed version is exactly 9.5.368.0
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Confirm the vulnerable productVerify whether you have PDF-XChange Editor, PDF-XChange PDF Tools, or both installed. Both products at version 9.5.368.0 are affectedAffected if Either product is installed at version 9.5.368.0
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Determine if U3D file handling is usedCheck for recent activity with .U3D files or examine whether 3D content in PDFs is commonly processed. U3D (Universal 3D) is a 3D model format embedded in PDFsAffected if The software processes or has processed U3D files or 3D PDF content
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Review PDF handling workflowsIdentify whether the software is used to open PDFs from untrusted sources, particularly PDFs containing embedded 3D objects or received via email or web downloadsAffected if Users open PDFs from untrusted or unknown sources that may contain embedded U3D content
You are affected if PDF-XChange Editor or PDF-XChange PDF Tools version 9.5.368.0 is installed and the software processes U3D files or 3D PDF content.
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.
From vendor dataUsers should avoid opening untrusted U3D files or visiting malicious pages until a vendor patch is available. Organizations should deploy email/web filtering for untrusted file types and consider sandboxing PDF-XChange Editor for high-risk workflows.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-42056 — 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-2023-42056 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