CVE-2026-113913 in iOS
Summary
by MITRE • 10/26/2026
An input validation issue was addressed with improved input validation. 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 web content may disclose sensitive information.
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Analysis
by VulDB Data Team • 10/26/2026
The vulnerability described involves a critical input validation flaw within the web content processing subsystem of Apple's operating systems, including iOS, iPadOS, macOS, and visionOS. This issue stems from insufficient sanitization or verification of data inputs before they are processed by the browser engine or related rendering components. In complex software architectures like those found in modern mobile and desktop operating systems, input validation is a primary defense mechanism against various classes of attacks. When this validation fails to properly restrict or verify the format, length, type, or content of user-supplied data, it creates an opening for malicious actors to inject unexpected or malformed inputs that the application does not anticipate handling correctly. The resolution in versions iOS 26.7.2, iPadOS 26.7.2, iOS 27.2, iPadOS 27.2, macOS Golden Gate 27.2, macOS Sequoia 15.8.2, macOS Tahoe 26.7.2, and visionOS 27.2 addresses this gap by implementing stricter checks to ensure that only well-formed and expected data structures are processed during web content rendering operations.
From a technical perspective, the core of this vulnerability lies in the failure to enforce strict boundaries on input parameters passed to functions responsible for parsing or interpreting web content such as HTML, JavaScript, CSS, or other markup languages. This type of flaw is commonly categorized under CWE-20 Improper Input Validation within the Common Weakness Enumeration framework. When an application processes external data without adequate validation, it may execute unintended logic paths or expose internal states that were not meant to be accessible. In the context of web content processing, this often manifests as a failure to properly escape special characters, validate URL structures, or check for buffer boundaries during memory allocation and manipulation tasks associated with rendering pages. The consequence is that an attacker who can influence the input data—typically through a maliciously crafted website visited by the user—can exploit these unchecked inputs to manipulate the application's behavior in ways that deviate from its intended design.
The operational impact of this vulnerability centers on the potential disclosure of sensitive information, which aligns with CWE-200 Exposure of Sensitive Information to an Unauthorized Actor. This means that through the exploitation of the input validation flaw, a remote attacker could potentially access memory contents, retrieve cookies or session tokens, extract cached data, or uncover internal application states that contain private user details such as credentials, personal identification information, or financial records. The attack vector is typically classified under ATT&CK technique T1059 Command and Scripting Interpreter if the vulnerability allows for code execution leading to data exfiltration, or more broadly within Information Discovery techniques where the goal is specifically to gather intelligence about the victim's environment rather than immediate system compromise. Because web content processing occurs frequently during normal device usage, this vulnerability presents a high-risk surface area that could be triggered simply by visiting a compromised webpage, making it particularly dangerous in scenarios involving drive-by downloads or malicious advertising networks.
Mitigation strategies for this type of vulnerability require both technical fixes and user awareness practices. On the developer side, as evidenced by Apple's release notes, the primary remediation involves enhancing input validation routines to strictly enforce expected data formats and reject any anomalous inputs before they reach critical processing functions. This includes implementing allow-listing approaches where only explicitly permitted characters or structures are accepted, rather than relying on block-lists which can be bypassed using encoding tricks or edge cases. For end-users, the most effective mitigation is to ensure that all devices running iOS, iPadOS, macOS, and visionOS are updated to the latest patched versions mentioned in the advisory. Keeping software up-to-date ensures that these critical security patches are applied promptly, closing the window of opportunity for attackers who might otherwise exploit this flaw to steal sensitive data from unpatched systems. Additionally, users should exercise caution when visiting unfamiliar websites or clicking on links from untrusted sources, as browser-based vulnerabilities often rely on social engineering elements to lure victims into triggering the malicious payload.