CVE-2018-4126
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 · uneditedA memory corruption issue was addressed with improved memory handling. This issue affected versions prior to iOS 12, macOS Mojave 10.14, tvOS 12, watchOS 5, iTunes 12.9 for Windows, iCloud for Windows 7.7.
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 confidenceA memory corruption vulnerability in Apple operating systems that was addressed through improved memory handling. This flaw existed in versions prior to iOS 12, macOS Mojave 10.14, tvOS 12, watchOS 5, iTunes 12.9 for Windows, and iCloud for Windows 7.7, potentially allowing local privilege escalation or arbitrary code execution.
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< 12.0< 10.14< 12< 5.0< 7.7< 12.9CVSS 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:3.0/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.
-
Identify the Apple product and platformDetermine which Apple software is installed: iOS device (iPhone/iPad), macOS computer, tvOS Apple TV, watchOS Apple Watch, iTunes for Windows, or iCloud for WindowsAffected if The product is one of the affected Apple operating systems or software listed in the CVE
-
Check iOS version on iPhone or iPadOpen Settings > General > About on the iOS device and look at the 'Version' fieldAffected if The version shown is earlier than 12.0 (for example, 11.4.1, 11.3, etc.)
-
Check macOS versionClick the Apple menu > About This Mac, or run 'sw_vers' in TerminalAffected if The version shown is earlier than 10.14 (such as 10.13.6, 10.12, etc.)
-
Check tvOS version on Apple TVGo to Settings > General > About on Apple TVAffected if The version shown is earlier than 12
-
Check watchOS version on Apple WatchOpen the Watch app on paired iPhone, go to General > About, or check on the watch in Settings > AboutAffected if The version shown is earlier than 5.0
-
Check iTunes or iCloud for Windows versionOpen iTunes or iCloud for Windows, go to Help > About (iTunes) or check the installed version in Programs and FeaturesAffected if iTunes version is earlier than 12.9, or iCloud for Windows version is earlier than 7.7
A system is affected if any Apple product listed is installed and its version falls below the fixed release (iOS 12.0, macOS 10.14, tvOS 12, watchOS 5.0, iTunes 12.9, iCloud 7.7).
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 data5.07.710.14
Apply the vendor-supplied patches by updating to iOS 12 or later, macOS Mojave 10.14 or later, tvOS 12 or later, watchOS 5 or later, iTunes 12.9 or later for Windows, and iCloud for Windows 7.7 or later.
- Consultation2.0 h
- Implementation8.0 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 $4,480.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-4126 — 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-2018-4126 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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