SafariWeb browser · Apple
CVE-2019-8586
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 memory handling. This issue is fixed in iOS 12.3, macOS Mojave 10.14.5, tvOS 12.3, Safari 12.1.1, iTunes for Windows 12.9.5, iCloud for Windows 7.12. Processing maliciously crafted web content may lead to arbitrary code execution.
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 confidenceThis is a WebKit memory corruption vulnerability that can be exploited by processing maliciously crafted web content, potentially leading to arbitrary code execution. It affects multiple Apple products including iOS, macOS, tvOS, Safari, iTunes for Windows, and iCloud for Windows.
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
SafariWeb browser
< 12.1.1< 7.12>= 10.0, < 10.4< 12.9.5< 12.3< 10.14.5< 12.3CVSS 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
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/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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Identify installed Apple productsCheck for Safari, iTunes, iCloud for Windows, or determine iOS/macOS/tvOS version via Settings or System PreferencesAffected if Any of these Apple products are installed on the system
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Determine Safari versionOpen Safari, go to Safari > About Safari (Mac) or Settings > Safari > About (iOS). Compare the version number to 12.1.1Affected if Safari version is lower than 12.1.1
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Determine iTunes versionOpen iTunes, go to Help > About iTunes. Compare the version number to 12.9.5 (Windows)Affected if iTunes version is lower than 12.9.5
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Determine iCloud for Windows versionOpen iCloud, click the iCloud icon > About iCloud. Compare version to 7.12 and check if it is >= 10.0 and < 10.4Affected if iCloud for Windows version is lower than 7.12, or between 10.0 and 10.4
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Determine macOS versionClick Apple menu > About This Mac. Compare the OS version to 10.14.5Affected if macOS version is lower than 10.14.5 (Mojave)
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Confirm WebKit content processing is enabledVerify that the affected application can process web content (this is enabled by default in Safari, iTunes, and iCloud)Affected if The application processes web content, which is the default behavior for affected applications
If any affected Apple product is installed with a version below the fixed threshold and can process web content (default state), the environment is vulnerable to CVE-2019-8586.
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 data7.1210.410.14.5
Apply the relevant vendor security updates: iOS 12.3, macOS Mojave 10.14.5, tvOS 12.3, Safari 12.1.1, iTunes 12.9.5, or iCloud for Windows 7.12 depending on the affected product.
Fix this in Safari
Scoped from the published advisory
- Consultation1.0 h
- Implementation2.0 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 $1,424.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-8586 — 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-2019-8586 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