CVE-2026-112611 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 Sequoia 15.8.2, macOS Tahoe 26.7.2. Processing a maliciously crafted PDF file may lead to memory corruption.
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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 components responsible for processing Portable Document Format files on Apple operating systems including iOS, iPadOS, and macOS variants such as Sequoia and Tahoe. This specific flaw arises from insufficient validation of input data boundaries during the parsing or rendering of PDF content. When a maliciously crafted PDF file is processed by these affected versions, the application fails to correctly verify that memory write operations remain within allocated buffer limits. Consequently, this lack of proper bounds checking allows an attacker to overwrite adjacent memory locations with arbitrary data. This type of defect is classically categorized under CWE-787: Out-of-bounds Write in standard vulnerability taxonomy frameworks, which highlights the critical nature of memory safety violations that can destabilize application execution and compromise system integrity.
The operational impact of this vulnerability extends beyond simple application crashes or denial of service scenarios due to its potential for arbitrary code execution. By exploiting an out-of-bounds write condition through a specially constructed PDF document, a threat actor may achieve remote code execution with the privileges of the user running the affected application. This aligns with ATT&CK technique T1203: Exploitation for Client Execution, where adversaries leverage vulnerabilities in client-side software to gain initial access or escalate privileges on targeted systems. The ability to corrupt memory structures can lead to control flow hijacking, allowing attackers to inject and execute malicious payloads directly within the context of the vulnerable process. This poses a significant risk to data confidentiality, integrity, and availability across personal devices running iOS and iPadOS as well as desktop environments utilizing macOS Sequoia or Tahoe.
Mitigation strategies primarily involve applying the vendor-provided software updates that address these bounds checking deficiencies. Users operating on iOS 26.7.2, iPadOS 26.7.2, iOS 27.2, iPadOS 27.2, macOS Sequoia 15.8.2, and macOS Tahoe 26.7.2 are advised to install the latest security patches immediately to close this attack vector. In addition to patching, organizations should enforce strict email filtering policies that scan incoming PDF attachments for known malicious patterns or anomalies indicative of exploitation attempts. Implementing sandboxed environments for viewing untrusted documents can further reduce the blast radius if a vulnerability is successfully triggered. Furthermore, enabling automatic updates ensures that devices remain protected against newly disclosed vulnerabilities without requiring manual intervention from end-users, thereby maintaining a robust security posture against document-based attacks.