CVE-2026-64771
A critical buffer overflow in Apple operating systems could let a remote attacker crash applications or corrupt memory. The flaw has been fixed in recent OS releases. Users should update to the latest version to protect themselves.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Apple devices running iOS, iPadOS, macOS, tvOS, or visionOS that have not yet updated to the latest releases (iOS 26.6, iPadOS 26.6, macOS Sequoia 15.7.8, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6).
Real-world impact
An attacker could cause applications to terminate unexpectedly or corrupt heap memory, leading to denial of service or enabling further exploitation.
Why this severity
The CVSS score of 9.8 reflects that the vulnerability is network‑exploitable with no authentication or user interaction, and it can compromise confidentiality, integrity, and availability.
What to do about it
- 01Open Settings > General > Software Update on your device.
- 02Install the latest available update (iOS 26.6, iPadOS 26.6, macOS Sequoia 15.7.8, macOS Tahoe 26.6, tvOS 26.6, or visionOS 26.6).
- 03Restart the device after the update completes.
NVD-referenced vendor advisory
Timeline
- Jul 27, 2026 · 3d agoPublishedDisclosed and added to the National Vulnerability Database.
- Jul 28, 2026 · 2d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.
How it’s attacked
References & advisories
- support.apple.com/en-us/128066release notesvendor advisory
- support.apple.com/en-us/128067release notesvendor advisory
- support.apple.com/en-us/128069release notesvendor advisory
- support.apple.com/en-us/128070release notesvendor advisory
- support.apple.com/en-us/128071release notesvendor advisory