CVE-2026-112683 in iOS
Summary
by MITRE • 10/26/2026
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.7.2 and iPadOS 26.7.2, iOS 27.2 and iPadOS 27.2, macOS Golden Gate 27.2, macOS Sequoia 15.8.2, macOS Tahoe 26.7.2, visionOS 27.2. Processing a maliciously crafted font may lead to unexpected app termination or corrupt process memory.
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Analysis
by VulDB Data Team • 10/27/2026
The vulnerability described involves an out-of-bounds write condition within the system's font processing subsystem, specifically affecting how applications handle malformed or maliciously constructed font files. This type of flaw typically arises when software fails to properly validate the length or boundaries of data structures before writing them into memory buffers. In this instance, the underlying issue was addressed by implementing improved bounds checking mechanisms that ensure write operations remain strictly within allocated memory regions. The absence of such checks previously allowed an attacker who could supply a crafted font file to trigger a buffer overflow, leading to writes beyond the intended destination in process memory. This category of defect is formally classified under CWE-787: Out-of-bounds Write, which represents one of the most critical classes of memory corruption vulnerabilities due to its potential for arbitrary code execution and system compromise.
From an operational perspective, processing a maliciously crafted font can result in immediate application termination or unpredictable behavior within the affected process. While some out-of-bounds writes may only cause denial of service through crashes, more sophisticated exploitation techniques could leverage this flaw to overwrite adjacent memory structures, such as function pointers or return addresses on the stack. This capability significantly increases the risk profile beyond simple instability, potentially allowing for remote code execution if an attacker can control the content written outside the buffer boundaries. The vulnerability impacts a wide range of Apple operating systems including iOS 26.7.2 and iPadOS 26.7.2, as well as newer releases like iOS 27.2 and iPadOS 27.2. It also affects macOS versions including Golden Gate 27.2, Sequoia 15.8.2, and Tahoe 26.7.2, along with visionOS 27.2, indicating that the font rendering engine is a shared component across these platforms.
In terms of threat modeling, this vulnerability aligns with ATT&CK technique T1203: Exploitation for Client Execution, where attackers often use social engineering or malicious documents to deliver exploits via common file formats like fonts. The attack vector typically involves convincing a user to open a document containing the embedded malicious font, thereby triggering the vulnerable code path during rendering. Defense in depth strategies are essential here since client-side applications frequently process untrusted input from external sources. Mitigation primarily relies on applying the provided software updates which contain the necessary patches for bounds checking. Organizations and individual users should ensure that all devices running iOS, iPadOS, macOS, or visionOS are updated to at least the specified versions listed in the advisory. Additionally, implementing application sandboxing policies can limit the impact of any successful exploitation by restricting the compromised process's access to sensitive system resources and other processes. Regular security awareness training for users regarding opening files from untrusted sources remains a critical complementary control against such delivery mechanisms.