High severity · published Jul 27, 2026
CVE-2026-28931
A buffer overflow was addressed with improved bounds checking
8.8
CVSS
0.5%
EPSS
No
On KEV
Description
A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, watchOS 26.6. Connecting to a malicious NFS server may lead to kernel memory corruption.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
macOS · Apple
before 26.6 · source: vendor, NVD
IO
iOS · Apple
before 26.6 · source: NVD
IA
iOS and iPadOS · Apple
before 26.6 · source: vendor
TV
tvOS · Apple
before 26.6 · source: vendor, NVD
WA
watchOS · Apple
before 26.6 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28931
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-28931
Release Notes
https://support.apple.com/en-us/128066
Release Notes
https://support.apple.com/en-us/128067
Release Notes
https://support.apple.com/en-us/128068
Release Notes
https://support.apple.com/en-us/128069
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