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High severity7.3NVD Advisory· Published May 11, 2026· Updated May 13, 2026

CVE-2026-43656

CVE-2026-43656

Description

An out-of-bounds write issue was addressed with improved input validation. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5. Parsing a maliciously crafted file may lead to an unexpected app termination.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

An out-of-bounds write in Apple OS parsing of malicious files could lead to app termination or denial-of-service, patched in multiple platforms May 2026.

Root

Cause CVE-2026-43656 is an out-of-bounds write vulnerability in the file parsing logic of Apple operating systems. The issue arises when the system processes a maliciously crafted file without proper input validation, allowing a write operation to access memory beyond the allocated buffer bounds.

Exploitation

Exploitation requires the victim to parse a maliciously crafted file, such as a document, image, or archive. The attack does not require elevated privileges, but it does rely on user interaction to open or process the file. The vulnerability exists in the core parsing layer present in multiple Apple platforms, including iOS, iPadOS, and macOS variants.

Impact

Successful exploitation could lead to an unexpected app termination, resulting in a denial-of-service (DoS) condition. The official advisories for the attacker may cause an app to unexpectedly terminate or, in the case of macOS Sequoia, cause an unexpected system termination. The vulnerability was addressed by Apple with improved input validation in the affected components.

Mitigation

Apple released security updates on May 11, 2026, for a wide range of products and versions, including iOS 18.7.9/iPadOS 18.7.9 (for older devices), iOS 26.5/iPadOS 26.5, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, and macOS Tahoe 26.5 [1][2][3][4]. Users are advised to update to the latest available version for their device. Apple also notes that for customer protection, they do not disclose security issues until an investigation and patches are ready.

References
  1. About the security content of macOS Tahoe 26.5 - Apple Support
  2. About the security content of iOS 26.5 and iPadOS 26.5 - Apple Support
  3. About the security content of iOS 18.7.9 and iPadOS 18.7.9 - Apple Support
  4. About the security content of macOS Sequoia 15.7.7 - Apple Support

AI Insight generated on May 18, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.

Affected products

3

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

5

News mentions

42