CVE-2026-65341: Apple Safari Buffer Overflow Vulnerability

CVE-2026-65341 Overview

CVE-2026-65341 is a memory corruption vulnerability affecting Apple Safari, iOS, iPadOS, and macOS. Processing maliciously crafted web content may trigger memory corruption within the browser engine. Apple addressed the flaw with improved memory handling in Safari 26.6.1, iOS 18.7.10, iPadOS 18.7.10, iOS 26.6.1, iPadOS 26.6.1, and macOS Tahoe 26.6.2. The weakness is classified under [CWE-119] (improper restriction of operations within the bounds of a memory buffer). Exploitation requires user interaction, typically by luring a target to a hostile webpage. Successful exploitation can compromise confidentiality and integrity of data processed by the browser.

Critical Impact
Remote attackers can trigger memory corruption in Safari and WebKit-based rendering across iOS, iPadOS, and macOS through crafted web content.

Affected Products

Apple Safari (prior to 26.6.1)
Apple iOS and iPadOS (prior to 18.7.10 and 26.6.1)
Apple macOS Tahoe (prior to 26.6.2)

Discovery Timeline

2026-08-17 - CVE-2026-65341 published to NVD
2026-08-18 - Last updated in NVD database

Technical Details for CVE-2026-65341

Vulnerability Analysis

The vulnerability resides in the web content processing path used by Safari and Apple's WebKit-based components. When Safari parses or renders maliciously crafted HTML, JavaScript, or associated web resources, memory handling routines fail to correctly enforce buffer boundaries. This produces a memory corruption condition classified as [CWE-119]. An attacker who controls a webpage can leverage this to influence process memory and impact data confidentiality and integrity within the browsing context. Apple's advisory describes the fix as "improved memory handling," indicating stricter validation of memory operations during content processing. The vulnerability requires user interaction, since a victim must load attacker-controlled content in a vulnerable browser or app that renders web content through WebKit.

Root Cause

The root cause is improper handling of memory buffers during processing of untrusted web content. Boundary checks or lifetime tracking in the affected code path allow crafted inputs to corrupt adjacent memory. Apple has not published exploitation specifics beyond the summary in its support documents.

Attack Vector

The attack vector is network-based. An attacker hosts or injects malicious web content on a page the target visits, or delivers it through an application that renders web content using WebKit. No credentials are required, but user interaction is needed to trigger the vulnerable code path. Refer to the Apple Support Document #148281 and related advisories for platform-specific technical notes.

Detection Methods for CVE-2026-65341

Indicators of Compromise

Unexpected Safari or WebKit process crashes with memory access violations shortly after visiting an unfamiliar URL.
Creation of unusual child processes or file writes originating from Safari, com.apple.WebKit.WebContent, or embedded web view processes.
Outbound network connections from Safari-hosted processes to previously unseen or low-reputation domains.

Detection Strategies

Monitor endpoint telemetry for WebKit process crashes correlated with browsing activity on newly registered or uncategorized domains.
Alert on anomalous behavior by WebContent processes such as spawning shells, loading unsigned libraries, or accessing sensitive user data directories.
Use web proxy or DNS logs to identify traffic to domains flagged as hosting exploit kits or drive-by content.

Monitoring Recommendations

Inventory macOS, iOS, and iPadOS device versions and flag hosts running Safari or OS builds below the fixed releases.
Track user reports of unexpected browser tab crashes and correlate with visited URLs for triage.
Ingest Apple system diagnostic reports into centralized logging to spot repeated WebKit fault signatures.

How to Mitigate CVE-2026-65341

Immediate Actions Required

Update Safari to version 26.6.1 on all supported macOS systems.
Upgrade iOS and iPadOS devices to 18.7.10 or 26.6.1, depending on the current major version.
Upgrade macOS Tahoe systems to 26.6.2.
Prioritize patching for users who routinely browse untrusted sites or handle sensitive data.

Patch Information

Apple released fixes documented in Apple Support Document #148281, Apple Support Document #148282, Apple Support Document #148286, and Apple Support Document #148287. The remediation is delivered through standard OS and Safari updates via Software Update.

Workarounds

Restrict browsing to trusted sites and enforce enterprise web filtering until devices are patched.
Disable JavaScript for high-risk browsing sessions where feasible, understanding this may break site functionality.
Deploy mobile device management (MDM) policies to require the fixed OS versions before granting access to corporate resources.

bash

# Configuration example: verify Safari and macOS versions on a managed endpoint
sw_vers -productVersion
defaults read /Applications/Safari.app/Contents/Info.plist CFBundleShortVersionString