CVE-2026-65336 Overview
CVE-2026-65336 is an improper input validation vulnerability [CWE-20] affecting Apple Safari and multiple Apple operating systems. Processing maliciously crafted web content triggers an unexpected Safari crash, resulting in a denial of service condition. Apple addressed the issue through improved state management in the affected components. The flaw requires user interaction, such as visiting a hostile web page, and does not compromise confidentiality or integrity.
Critical Impact
Attackers can crash Safari on unpatched Apple devices by luring users to malicious web content, disrupting browsing sessions across iOS, iPadOS, and macOS.
Affected Products
- Apple iOS 18.7.10 and iPadOS 18.7.10 (and earlier)
- Apple iOS 26.6.1 and iPadOS 26.6.1 (and earlier)
- Apple macOS Tahoe (fixed in 26.6.2) and Safari (fixed in 26.6.1)
Discovery Timeline
- 2026-08-17 - CVE-2026-65336 published to the National Vulnerability Database (NVD)
- 2026-08-18 - Last updated in NVD database
Technical Details for CVE-2026-65336
Vulnerability Analysis
The vulnerability resides in Safari's handling of specially crafted web content. When the browser parses hostile HTML, JavaScript, or associated web resources, an internal state inconsistency causes the process to terminate unexpectedly. Apple's advisories describe the fix as improved state management, indicating the underlying component did not correctly track object or engine state across processing steps.
The issue is classified under [CWE-20: Improper Input Validation]. Exploitation results in application-level denial of service rather than code execution or data disclosure. The CVSS vector reflects a network-delivered attack requiring user interaction and yielding low availability impact only.
Root Cause
The root cause is improper state management inside Safari's web content processing pipeline. Malformed input transitions an internal component into an unexpected state, triggering an unhandled condition that crashes the browser process. No memory corruption or privilege escalation has been reported.
Attack Vector
An attacker hosts crafted web content on a controlled site or injects it into a page reachable by the victim. When the victim visits the page in a vulnerable Safari build, the renderer crashes. Delivery vectors include phishing links, malicious advertisements, and compromised third-party content embedded in trusted sites.
No verified public proof-of-concept is available. The vulnerability mechanism is described in prose because Apple has not published exploit-level technical details. Refer to the Apple Support Article #148286 for vendor documentation.
Detection Methods for CVE-2026-65336
Indicators of Compromise
- Repeated or unexpected Safari process termination on iOS, iPadOS, or macOS devices after visiting external links.
- Crash reports referencing WebKit or Safari renderer components on unpatched OS builds.
- Endpoint telemetry showing Safari relaunches correlated with navigation to unfamiliar domains.
Detection Strategies
- Correlate browser crash events with recent URL history and referrer data to identify potentially hostile pages.
- Monitor mobile device management (MDM) inventory for Safari, iOS, iPadOS, and macOS builds below the patched versions.
- Inspect web proxy and DNS logs for user navigation to newly registered or low-reputation domains preceding crash events.
Monitoring Recommendations
- Enable centralized crash log collection from managed macOS endpoints and mobile devices.
- Track OS and Safari version compliance against Apple's patched releases through fleet management tooling.
- Alert on repeated Safari crashes affecting the same user or device within short time windows.
How to Mitigate CVE-2026-65336
Immediate Actions Required
- Update affected devices to Safari 26.6.1, iOS 18.7.10, iPadOS 18.7.10, iOS 26.6.1, iPadOS 26.6.1, or macOS Tahoe 26.6.2.
- Prioritize patch deployment for users who routinely browse untrusted external content.
- Communicate the risk of unsolicited links to end users while patches are rolling out.
Patch Information
Apple released fixes across Safari, iOS, iPadOS, and macOS. Consult the Apple Support Article #148281, Apple Support Article #148282, and Apple Support Article #148287 for full version details and download instructions.
Workarounds
- Restrict Safari use for browsing untrusted content until affected devices receive the vendor patch.
- Enforce web filtering at the network layer to block known malicious domains and reduce exposure to hostile pages.
- Use MDM policies to require the minimum patched OS versions before allowing access to corporate resources.
# Verify installed macOS and Safari versions on managed endpoints
sw_vers -productVersion
defaults read /Applications/Safari.app/Contents/Info.plist CFBundleShortVersionString
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
