Medium severity · published Sep 14, 2026
CVE-2026-84531
An out-of-bounds write issue was addressed with improved bounds checking
6.2
CVSS
0.1%
EPSS
No
On KEV
Description
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27. Processing maliciously crafted NTLM input may lead to unexpected app termination.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MA
macOS · Apple
before 27 · source: vendor, NVD
IO
iOS · Apple
before 27.0 · source: NVD
IA
iOS and iPadOS · Apple
before 27 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-84531
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-84531
Vendor Advisory
https://support.apple.com/en-us/149034
Vendor Advisory
https://support.apple.com/en-us/149035
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