PT-2026-39826 · Apple · Tvos+5

Heapsmasher + 1 · Published 2026-05-11 · Updated 2026-05-11 · CVE-2026-28991

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions iOS versions prior to 26.5 iPadOS versions prior to 26.5 macOS Tahoe versions prior to 26.5 tvOS versions prior to 26.5 visionOS versions prior to 26.5 watchOS versions prior to 26.5

Description An out-of-bounds read—a condition where a program reads data past the end of the intended buffer—was identified. This issue may allow an application to cause a denial-of-service.

Recommendations Update iOS to version 26.5. Update iPadOS to version 26.5. Update macOS Tahoe to version 26.5. Update tvOS to version 26.5. Update visionOS to version 26.5. Update watchOS to version 26.5.

Fix

DoS

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-28991

Affected Products

Ios

Ipados

Macos Tahoe

Tvos

Visionos

Watchos

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-28991 · Security Note
• https://support.apple.com/en-us/127110 · Note
• https://support.apple.com/en-us/127115 · Note
• https://support.apple.com/en-us/127120 · Note
• https://support.apple.com/en-us/127118 · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-28991 · Note
• https://support.apple.com/en-us/127119 · Note