CVE-2019-8756
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 · uneditedMultiple memory corruption issues were addressed with improved input validation. This issue is fixed in macOS Catalina 10.15, iOS 13, iCloud for Windows 7.14, iCloud for Windows 10.7, tvOS 13, macOS Catalina 10.15.1, Security Update 2019-001, and Security Update 2019-006, watchOS 6, iTunes 12.10.1 for Windows. Multiple issues in libxml2.
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 confidenceCVE-2019-8756 is a memory corruption vulnerability in libxml2, a widely-used XML parsing library. Multiple memory corruption issues were addressed with improved input validation. This affects multiple Apple products including macOS, iOS, iCloud for Windows, tvOS, and watchOS.
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< 7.14>= 10.0, < 10.7< 12.10.1< 10.15< 13< 6.0CVSS 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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 macOS versionGo to Apple menu > About This Mac to view the system version numberAffected if Version is earlier than 10.15 (Catalina)
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Check iTunes version on WindowsOpen iTunes, go to Help > About iTunes to display the version numberAffected if Version is earlier than 12.10.1
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Check iCloud for Windows versionOpen iCloud, click the version number displayed in the about or settings areaAffected if Version is earlier than 7.14, or version is 10.0 or later but earlier than 10.7
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Check tvOS version on Apple TVGo to Settings > System > About to view the tvOS versionAffected if Version is earlier than 13
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Check watchOS version on Apple WatchOpen the Watch app on iPhone, go to General > About to view watchOS versionAffected if Version is earlier than 6.0
If any of the above products are installed and the detected version falls within the affected ranges, the environment is vulnerable to CVE-2019-8756.
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 · scoped6.07.1410.7
Apply the relevant security updates for the affected Apple products: macOS Catalina 10.15.1 or Security Update 2019-001/2019-006, iOS 13, tvOS 13, watchOS 6, iCloud for Windows 7.14/10.7, or iTunes 12.10.1 for Windows.
macOS Catalina 10.15+, iOS 13+, tvOS 13+, watchOS 6+, iTunes 12.10.1 for Windows, iCloud for Windows 7.14/10.7+
- For macOS users: Upgrade to macOS Catalina 10.15 or later, or apply Security Update 2019-001 or Security Update 2019-006 for earlier macOS versions
- For iOS users: Upgrade to iOS 13 or later
- For tvOS users: Upgrade to tvOS 13 or later
- For watchOS users: Upgrade to watchOS 6 or later
- For Windows iTunes users: Upgrade to iTunes 12.10.1 or later
- For Windows iCloud users: Upgrade to iCloud for Windows 7.14 (if using version 7.x) or iCloud for Windows 10.7 (if using version 10.x) or later
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,328.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-8756 — 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-2019-8756 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