CVE-2026-43740 in Safari
Summary
by MITRE • 06/30/2026
The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may result in the disclosure of process memory.
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Analysis
by VulDB Data Team • 06/30/2026
This vulnerability represents a memory safety issue that was resolved through enhanced memory handling mechanisms within Apple's web browser ecosystem. The flaw existed in Safari versions prior to 26.5.2 across multiple platforms including iOS, iPadOS, and macOS Tahoe. The vulnerability stems from insufficient memory management when processing specially crafted web content, creating potential pathways for attackers to extract sensitive information from process memory. This type of vulnerability falls under the broader category of memory corruption issues that can lead to information disclosure attacks.
The technical nature of this flaw demonstrates weaknesses in how the browser handles memory allocation and deallocation during web content rendering processes. When users encounter maliciously crafted web pages, the improper memory handling can cause the system to leak process memory contents through various attack vectors. This vulnerability is particularly concerning as it operates at the core level of browser security where memory management intersects with user interaction. The issue likely involves buffer overflows, use-after-free conditions, or similar memory corruption patterns that allow unauthorized access to sensitive data.
The operational impact of this vulnerability extends beyond simple information disclosure, potentially enabling attackers to extract credentials, session tokens, or other confidential data from running browser processes. Security researchers have identified this issue as a critical concern for web browsing environments where users encounter untrusted content. The vulnerability affects all versions prior to the patched releases, meaning that users operating on older system versions remain exposed to potential exploitation. This type of flaw commonly maps to CWE-125 (Out-of-bounds Read) or CWE-476 (NULL Pointer Dereference) categories when memory handling is inadequate.
Organizations and individuals should prioritize immediate deployment of the patched versions including Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2 to mitigate potential exploitation risks. The mitigation strategy should include comprehensive system updates across all affected platforms and regular monitoring for similar memory handling vulnerabilities. Security teams should implement network-based detection measures to identify attempts to exploit this vulnerability through malicious web content delivery. This remediation approach aligns with ATT&CK framework techniques related to privilege escalation and credential access through memory corruption attacks.
The fix implemented by Apple demonstrates proper memory management practices including bounds checking, proper deallocation procedures, and enhanced input validation for web content processing. These improvements help ensure that browser processes maintain proper isolation and prevent unauthorized memory access patterns. Regular security assessments should verify that similar memory handling issues do not exist in other components of the browser ecosystem. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date security patches across all system components to prevent exploitation through memory-based attack vectors.