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CVE-2026-39868

Published: Jun 29, 2026Updated: Aug 17, 2026 Sources: CVE List NVDCWE-20
9.1CRITICAL
NVD MITRE
EPSS Score
1.2%
Top 33.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

Description

This issue was addressed with improved input validation. This issue is fixed in iOS 18.7.10 and iPadOS 18.7.10, iOS 26.5.2 and iPadOS 26.5.2, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, watchOS 26.6. An app may be able to cause unexpected system termination or corrupt kernel memory.

In plain language

AI Low urgency

This is a bug in Apple iOS and macOS that could let an app crash the system or corrupt low-level memory; typical small businesses should update to the latest iOS 26.5.2 / iPadOS 26.5.2 / macOS Tahoe 26.5.2 when convenient.

Executive summary

Improved input validation in iOS/iPadOS and macOS Tahoe 26.5.2 fixes a flaw where a malformed input from an app could trigger unexpected system termination or kernel memory corruption (attack vector and reachability details not publicly specified).

If affected, business impact
App-triggered device crashesPotential system instabilityService interruption riskPossible data loss from crashes

What to do now

  1. Check which Apple devices you use (iPhone/iPad/Mac) and their current operating system versions.
  2. Update iPhone and iPad to iOS 26.5.2 and iPadOS 26.5.2.
  3. Update Macs to macOS Tahoe 26.5.2.
  4. After updating, verify devices are stable by running your normal apps and watching for unexpected restarts.
Usually a quick update

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-20

Affected Products

Apple
commercial·USaka apple inc., apple computer
ipadosEmbeddedOS
Operating Systems / mobile-os
iOS and iPadOSEmbeddedOS
Operating Systems / mobile-os
macOSOn-premOS
Operating Systems / unix-bsd
tvOSEmbeddedOS
Operating Systems / mobile-os
visionOSOS
Operating Systems / mobile-os
watchOSEmbeddedOS
Operating Systems / mobile-os
and 2 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-39868?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://support.apple.com/en-us/127594
support.apple.com
https://support.apple.com/en-us/127595
support.apple.com
https://support.apple.com/en-us/128068
support.apple.com
and 5 more references View all →
News mentions
4

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