CVE-2024-8840
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 JB2 File Parsing Out-Of-Bounds Read Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code 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 JB2 files. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. . Was ZDI-CAN-24420.
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 confidenceAn out-of-bounds read vulnerability exists in PDF-XChange Editor's JB2 file parser due to insufficient validation of user-supplied data. When parsing a maliciously crafted JB2 file, the parser reads past the end of an allocated buffer, potentially allowing an attacker to execute arbitrary code in the context of the current process. Exploitation requires user interaction (opening a malicious file or visiting a malicious page).
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= 10.3.0.386= 10.3.0.386CVSS 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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Check if PDF-XChange Editor is installedOpen Windows Registry and navigate to HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall or check C:\Program Files\PDF-XChange\PDF-XChange Editor for the executable, then right-click the application executable and select Properties to view the Version fieldAffected if The installed version matches exactly 10.3.0.386
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Check if PDF-XChange PDF Tools is installedOpen Windows Registry and navigate to HKLM\SOFTWARE\PDF-XChange or check for installation directories, then view the version information of the installed componentsAffected if The installed version matches exactly 10.3.0.386
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Identify JB2 file handling capabilityOpen PDF-XChange Editor, go to File > Preferences > File Associations or check the application capabilities for JB2/JBIG2 image format support - JB2 is the native JBIG2 format used in some PDF filesAffected if JB2 file parsing is enabled and the application attempts to render JB2 content from untrusted files
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Determine exposure to untrusted filesReview whether users in the environment routinely open PDF files from untrusted or unknown sources, or check browser/plugin settings that may automatically open PDF filesAffected if Users can open or preview untrusted PDF files containing JB2 imagery
A system is affected only if PDF-XChange Editor or PDF-XChange PDF Tools version 10.3.0.386 is installed AND users can open untrusted PDF files with JB2 content, as the out-of-bounds read occurs when parsing malicious JB2 data.
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 dataApply the vendor patch for CVE-2024-8840 when available; until then, restrict or disable PDF-XChange Editor's handling of untrusted JB2 files and advise users against opening files from untrusted sources.
- Consultation4.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-8840 — 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-2024-8840 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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- 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
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