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CVE-2026-28858

Apple iPadOS buffer overflow

9.8 CRITICALEPSS 0.56%
  1. Published25 Mar 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Apple iPadOS< 26.4
Apple iPhone OS< 26.4

Remediation

Fixed in
Apple iPadOS≥ 26.4
Apple iPhone OS≥ 26.4

References

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Frequently asked

Is CVE-2026-28858 being actively exploited?

CVE-2026-28858 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.56%.

How severe is CVE-2026-28858?

CVE-2026-28858 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.56% probability of exploitation.

Which products are affected by CVE-2026-28858?

Affected products include Apple iPadOS, Apple iPhone OS.

How do I fix CVE-2026-28858?

Upgrade affected software to a fixed version, for example Apple iPadOS 26.4, Apple iPhone OS 26.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-28858 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.