CVE-2026-112563 in macOS
Summary
by MITRE • 10/26/2026
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27.2, macOS Sequoia 15.8.2, macOS Tahoe 26.7.2, tvOS 27.2, visionOS 27.2. Processing a maliciously crafted file may lead to unexpected app termination.
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Analysis
by VulDB Data Team • 10/27/2026
The vulnerability described constitutes an out-of-bounds write flaw within the core processing logic of Apple's operating systems, specifically affecting macOS versions including Golden Gate 27.2, Sequoia 15.8.2, and Tahoe 26.7.2, as well as tvOS 27.2 and visionOS 27.2. This type of memory corruption error typically arises when a software application writes data to a buffer beyond its allocated boundaries, often due to insufficient validation of input parameters or incorrect calculation of array indices. In this specific instance, the issue was addressed by implementing improved bounds checking mechanisms within the affected components. These enhancements ensure that any write operations are strictly confined within the memory regions explicitly assigned to them, thereby preventing unauthorized access to adjacent memory structures and preserving data integrity.
From a technical perspective, out-of-bounds writes represent a critical class of vulnerabilities because they allow an attacker to manipulate memory contents in ways that can lead to arbitrary code execution or denial of service conditions. While the immediate observable impact described is unexpected application termination, which aligns with a Denial of Service scenario classified under CWE-787: Out-of-Bounds Write, such flaws often serve as stepping stones for more severe exploits if not properly mitigated at the system level. The ability to write outside allocated buffers can potentially overwrite critical control data, function pointers, or exception handlers, although in this specific case, Apple's mitigation strategies appear to have focused on stabilizing the application state rather than allowing full exploitation. This suggests that the vulnerability was likely triggered by processing maliciously crafted files designed to exploit edge cases in file parsing routines where input length or structure validation was previously inadequate.
The operational impact of this vulnerability centers on system stability and availability for users interacting with untrusted content. By processing a specially constructed file, an attacker could cause the affected application to crash unexpectedly. This denial of service condition disrupts normal workflow and can lead to data loss if unsaved work is involved. Furthermore, repeated crashes may degrade user trust in the platform's reliability. The inclusion of this fix across multiple operating system families indicates that the underlying component responsible for file processing is shared or similarly implemented across macOS, tvOS, and visionOS ecosystems, highlighting a systemic risk that required coordinated patching efforts to ensure consistent security posture across Apple's device portfolio.
To mitigate such risks, it is imperative for organizations and individual users to apply the latest software updates immediately upon release. The fixes provided in macOS Golden Gate 27.2, Sequoia 15.8.2, Tahoe 26.7.2, tvOS 27.2, and visionOS 27.2 directly address the root cause by enforcing stricter memory access controls. Beyond patching, security best practices recommend employing application sandboxing to limit the potential impact of any residual vulnerabilities, as well as utilizing input validation strategies at the network perimeter if these files are received via email or web services. Monitoring for anomalous process termination events can also aid in detecting attempted exploitation activities before they escalate into more significant system compromises. This incident underscores the importance of continuous memory safety improvements and rigorous bounds checking in software development lifecycles to prevent common classes of memory corruption vulnerabilities.