Out-of-bounds write in macOS - CVE-2026-43666

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Main Vulnerability Database Vulnerabilities #VU131049

Out-of-bounds write in macOS - CVE-2026-43666

Published: May 12, 2026


Vulnerability identifier: #VU131049
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-43666
CWE-ID: CWE-787
Exploitation vector: Adjecent network
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker on the local network to perform a denial of service (DoS) attack.

The vulnerability exists due to an out-of-bounds write in mDNSResponder. A remote attacker on the local network can cause a denial-of-service.


Affected software

macOS
iPadOS
Apple iOS
tvOS
visionOS
watchOS

How to mitigate CVE-2026-43666

Install update from vendor's website.

macOS - addressed in versions 26.5 25F71, 14.8.7 23J520, 15.7.7 24G720
iPadOS - addressed in versions 18.7.9 22H355, 26.5 23F77
Apple iOS - addressed in versions 18.7.9 22H355, 26.5 23F77
tvOS - update to 26.5 23L471
visionOS - update to 26.5
watchOS - update to 26.5 23T570

External References

Related Security Bulletins