CVE-2026-65390: Apple WebKit integer overflow in image processing

CVE-2026-65390 · Severity: high · CVSS 8.8 · Published 2026-09-14

WebKit, the rendering engine used by Safari and other Apple applications, contains an integer overflow vulnerability in its image processing component. An attacker can exploit this by delivering maliciously crafted web content that triggers memory corruption, potentially allowing code execution or causing application crashes. This affects millions of users across Apple's ecosystem including Safari, iOS, iPadOS, and macOS devices.

Technologies: Apple iPadOS, Apple Iphone Os, Apple macOS, Apple Safari, Apple Tvos, Apple Visionos, Apple watchOS. Vendors: Apple.

Quick answers

Is CVE-2026-65390 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-65390 being exploited in the wild.
How severe is CVE-2026-65390?
High severity, with a CVSS score of 8.8, published 14 September 2026.
Which products and versions are affected?
Apple iPadOS before 26.6.1; Apple macOS Tahoe before 26.6.2; Apple Safari before 26.6.1; Apple Tvos before 27; and 2 more.
Is there a fix for CVE-2026-65390?
A patch was published on 2026-08-17: Patches released: Safari 26.6.1, iOS 26.6.1, iPadOS 26.6.1, macOS Tahoe 26.6.2, tvOS 27, visionOS 27, watchOS 27 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-65390 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-65390?
Check whether you run Apple iPadOS, Apple Iphone Os, Apple macOS or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

CVE-2026-65390 is an integer overflow vulnerability in WebKit's image processing routines. The vulnerability occurs when parsing maliciously crafted image data, where insufficient input validation allows integer overflow to occur, leading to heap buffer overflow and memory corruption. The attack requires the user to visit a malicious website or view crafted web content—no authentication is required. Successful exploitation can lead to arbitrary code execution with the privileges of the Safari process or other applications using WebKit. Apple addressed this issue with improved input validation in Safari 26.6.1, iOS 26.6.1, iPadOS 26.6.1, macOS Tahoe 26.6.2, tvOS 27, visionOS 27, and watchOS 27.

Affected products

  • Apple Safari before 26.6.1
  • Apple iOS before 26.6.1
  • Apple iPadOS before 26.6.1
  • Apple macOS Tahoe before 26.6.2
  • Apple tvOS before 27
  • Apple visionOS before 27
  • Apple watchOS before 27

Timeline

  • 2026-09-14: disclosed: CVE-2026-65390 disclosed and security advisory published
  • 2026-08-17: patched: Patches released: Safari 26.6.1, iOS 26.6.1, iPadOS 26.6.1, macOS Tahoe 26.6.2, tvOS 27, visionOS 27, watchOS 27

References

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