1. Home
  2. CVE Database
  3. CVE-2026-28858
CRITICAL · 9.8

CVE-2026-28858

A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 26.4 and iPadOS 26.4. A remote user may be able to cause unexpected system termination or corrupt kernel memor...

Vulnerability Description

A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 26.4 and iPadOS 26.4. A remote user may be able to cause unexpected system termination or corrupt kernel memory.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
AppleIpados< 26.4
AppleIphone Os< 26.4

Related Weaknesses (CWE)

CWE-120

References

FAQ

What is CVE-2026-28858?

CVE-2026-28858 is a vulnerability with a CVSS score of 9.8 (CRITICAL). A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 26.4 and iPadOS 26.4. A remote user may be able to cause unexpected system termination or corrupt kernel memor...

How severe is CVE-2026-28858?

CVE-2026-28858 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-28858?

Check the references section above for vendor advisories and patch information. Affected products include: Apple Ipados, Apple Iphone Os.