CVE-2026-86985 in Safari
Summary
by MITRE • 10/26/2026
This issue was addressed with improved input validation. This issue is fixed in Safari 27.2, iOS 26.7.2 and iPadOS 26.7.2, iOS 27.2 and iPadOS 27.2, macOS Golden Gate 27.2, tvOS 27.2. Processing maliciously crafted web content may lead to an unexpected process crash.
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Analysis
by VulDB Data Team • 10/26/2026
The vulnerability described involves a failure in input validation within the rendering engine of Safari and related Apple operating systems including iOS, iPadOS, macOS, and tvOS. Specifically, when processing web content that has been maliciously crafted by an attacker, the application fails to properly sanitize or validate specific inputs before execution. This lack of rigorous checks allows malformed data structures or unexpected character sequences to bypass internal safety mechanisms, leading to a state where the browser process cannot handle the input gracefully. The primary manifestation of this flaw is an unexpected process crash, which indicates that the error condition triggers an exception or memory violation that terminates the application rather than handling it through safe fallback procedures.
From a technical perspective, this issue aligns with common categories such as CWE-20 Improper Input Validation and potentially CWE-787 Out-of-bounds Write if the malformed content causes memory corruption beyond simple termination. The attack vector typically involves an attacker hosting malicious web pages or embedding harmful scripts within legitimate sites that users visit. When a victim accesses this content, their browser attempts to parse and render it. Due to the insufficient validation logic in the affected versions of Safari 27.2, iOS 26.7.2, iPadOS 26.7.2, iOS 27.2, iPadOS 27.2, macOS Golden Gate 27.2, and tvOS 27.2, the rendering engine encounters an unhandled condition. This results in a denial of service for the user as their browsing session is abruptly terminated. While immediate exploitation for arbitrary code execution may not be confirmed based solely on this description, crashes are often precursors to more severe vulnerabilities such as heap corruption or use-after-free conditions that could potentially lead to remote code execution if further analysis reveals deeper memory safety issues.
The operational impact of this vulnerability centers on reliability and availability rather than direct data compromise in its current disclosed form. Users experience interrupted browsing sessions which can be particularly disruptive during critical tasks requiring continuous web access. For enterprise environments relying on these devices for productivity, frequent crashes due to maliciously crafted content undermine trust in the platform's stability. Furthermore, if this crash behavior is consistent and predictable, it could potentially aid attackers in fingerprinting browser versions or triggering specific error states that might be leveraged in conjunction with other vulnerabilities. The lack of graceful degradation means that even non-exploitative malformed input can degrade user experience significantly.
Mitigation strategies primarily involve applying the software updates provided by Apple which address these validation gaps. Administrators should ensure all devices running iOS, iPadOS, macOS, and tvOS are updated to the specified patched versions where improved input validation logic has been implemented. Until patches are applied, users can mitigate risk by exercising caution with untrusted web content and utilizing browser extensions or security tools that filter potentially dangerous scripts before they reach the rendering engine. Additionally, enabling features like Content Security Policy (CSP) on personal websites can help restrict how external resources are loaded, reducing the attack surface for such input validation flaws. Continuous monitoring of vendor advisories is essential as further details regarding potential exploitability may emerge over time.