Out-of-bounds write in macOS - CVE-2026-84515
Published: September 15, 2026
Vulnerability identifier: #VU149861
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-84515
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing untrusted input in SMB server. A remote attacker can trick the victim into connecting to a malicious SBM server, trigger an out-of-bounds write and execute arbitrary code on the target system.
Affected software
macOS
How to mitigate CVE-2026-84515
Install updates from vendor's website.
macOS - addressed in versions 26.7 25G229, 15.8 24H23