SafariWeb browser · Apple
CVE-2026-64783
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 use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 26.6, iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, visionOS 26.6, watchOS 26.6. Processing maliciously crafted web content may lead to an unexpected Safari crash.
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 confidenceUse-after-free vulnerability in WebKit affecting Safari and system browsers on iOS, iPadOS, macOS, visionOS, and watchOS. Processing maliciously crafted web content can trigger the vulnerability, leading to unexpected browser crashes.
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
< 26.6< 26.6< 26.6>= 26.0, < 26.6< 26.6< 26.6CVSS 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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Check Safari version on macOSOpen Safari, click Safari menu > About Safari, or run 'defaults read /Applications/Safari.app/Contents/Info CFBundleShortVersionString' in TerminalAffected if Version is less than 26.6 or between 26.0 and 26.5
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Check iOS or iPadOS versionGo to Settings > General > About on iPhone or iPad, or connect device to computer and check in Finder/iTunesAffected if Version is less than 26.6
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Check visionOS versionGo to Settings > General > About on Apple Vision deviceAffected if Version is less than 26.6
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Check watchOS versionOpen Watch app on paired iPhone, go to My Watch > General > About, or check on Apple Watch in Settings > General > AboutAffected if Version is less than 26.6
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Identify WebKit-based browsers in useCheck installed browsers (such as Safari, or third-party browsers that use WebKit engine) and note their versionsAffected if Any WebKit-based browser version is below 26.6
You are affected if any Safari, iOS, iPadOS, macOS, visionOS, or watchOS installation is running version 26.0 to 26.5 (or any version below 26.6 for non-macOS platforms), as the use-after-free in WebKit requires processing of malicious web content to trigger.
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 · scoped26.6
Apply vendor security updates to Safari 26.6, iOS 26.6, iPadOS 26.6, macOS Tahoe 26.6, visionOS 26.6, or watchOS 26.6 as appropriate for affected devices.
Safari 26.6, iOS 26.6, iPadOS 26.6, macOS Tahoe 26.6, visionOS 26.6, watchOS 26.6
- Check current version of the affected Apple product (Safari, iOS, iPadOS, macOS, visionOS, or watchOS)
- Open System Settings or System Preferences
- Navigate to Software Update or General > Software Update
- Install the available update to version 26.6
- Verify the update was successfully installed by checking the version number
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Safari
Scoped from the published advisory
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 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 $1,696.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-64783 — 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-2026-64783 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