dbcve.org
SafariWeb browser · Apple

CVE-2025-43342

CRITICAL · 9.8 CVSS v3.1 Published 2025-09-15
Fix available
A fix is available. Upgrade to 2.48.7 / 18.7 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
A correctness issue was addressed with improved checks. This issue is fixed in Safari 26, iOS 18.7 and iPadOS 18.7, iOS 26 and iPadOS 26, macOS Tahoe 26, tvOS 26, visionOS 26, watchOS 26. Processing maliciously crafted web content may lead to an unexpected process 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 · moderate confidence

This is a WebKit vulnerability where processing maliciously crafted web content triggers an unexpected process crash due to a correctness issue (likely a memory safety flaw such as buffer overflow, out-of-bounds access, or type confusion). The fix involves improved bounds or sanity checks in the browser engine.

MitigationUpdate all affected Apple devices (Safari, iOS, iPadOS, macOS, tvOS, visionOS, watchOS) to the patched versions specified in the advisory.

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
Affected:< 26.0
IpadosOperating system
Affected:< 18.7
Iphone OsOperating system
Affected:< 18.7
macOSOperating system
Affected:< 26.0
TvosOperating system
Affected:< 26.0
VisionosOperating system
Affected:< 26.0
WatchosOperating system
Affected:< 26.0
WebkitgtkWeb browser
Affected:< 2.48.7

CVSS 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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify the WebKit-based browser or application in use
    On macOS, check Applications folder for Safari. On iOS/iPadOS, check for Safari app. On Linux systems with WebKitGTK, identify applications using webkit2gtk (such as Epiphany/Gnome Web, Evolution, or others) using 'dpkg -l | grep webkit' or 'rpm -qa | grep webkit'.
    Affected if A WebKit-based browser or application is actively used to render web content.
  2. Check Safari version on macOS
    Open Safari, click Safari menu > About Safari. The version number is displayed next to the Safari name. Alternatively, run 'defaults read /Applications/Safari.app/Contents/Info CFBundleShortVersionString' in Terminal.
    Affected if The displayed version is below 26.0 (for example, 25.4.x or earlier).
  3. Check iOS or iPadOS version for built-in Safari
    Open Settings > General > About on the iOS/iPadOS device. The version number is displayed next to 'Version'. Note: Safari is bundled with iOS/iPadOS, so the OS version determines Safari's WebKit version.
    Affected if The iOS version is below 18.7 (for example, 18.6.x or earlier), or the iPadOS version is below 18.7.
  4. Check tvOS, watchOS, or visionOS version for built-in WebKit
    Open Settings > General > About on the tvOS, watchOS, or visionOS device. The version number is displayed. Apps using WebKit on these platforms inherit the OS version.
    Affected if The tvOS version is below 26.0, watchOS version is below 26.0, or visionOS version is below 26.0.
  5. Check WebKitGTK version on Linux systems
    Run 'dpkg -l libwebkit2gtk-4.1-0' (Debian/Ubuntu) or 'rpm -q webkit2gtk' (Fedora/RHEL) to query the installed WebKitGTK package version. Also check 'webkit2gtk' via 'pkg-config --modversion webkit2gtk-4.1'.
    Affected if The WebKitGTK version is below 2.48.7 (for example, 2.48.5 or earlier).

A user is affected if they use a WebKit-based browser or application (Safari, WebKitGTK-based apps) with a version below the thresholds (Safari/macOS < 26.0, iOS/iPadOS < 18.7, tvOS/watchOS/visionOS < 26.0, WebKitGTK < 2.48.7) and have the ability to process web content.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 2.48.7 / 18.7 / 26.0 or later
Fixed in 2.48.718.726.0
Interim mitigation

Update all affected Apple devices (Safari, iOS, iPadOS, macOS, tvOS, visionOS, watchOS) to the patched versions specified in the advisory.

Recommended fix High confidence

Safari 26.0, iOS 18.7, iPadOS 18.7, macOS 26.0, tvOS 26.0, visionOS 26.0, watchOS 26.0, WebKitGTK 2.48.7

  1. Check current version: On macOS/iOS/iPadOS/tvOS/watchOS/visionOS, go to Settings > General > Software Update (or Apple menu > System Settings > Software Update on macOS)
  2. For Safari: Update via macOS system update or Safari > About Safari
  3. For WebKitGTK: Check distribution package manager for webkit2gtk version (e.g., dpkg -l | grep webkit or rpm -qa | grep webkit)
  4. Apply available updates to reach the fixed version
Caveat Major version upgrades (e.g., to macOS 26) may introduce UI changes or deprecate older features; minor version updates (18.7, 2.48.7) typically have minimal risk

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Safari Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
5.0 hours of engineering $890
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-43342 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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