Out-of-bounds read in macOS - CVE-2026-28920

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Main Vulnerability Database Vulnerabilities #VU131092

Out-of-bounds read in macOS - CVE-2026-28920

Published: May 12, 2026


Vulnerability identifier: #VU131092
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-28920
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in zlib. A remote attacker can trick the victim into visiting a specially crafted website, trigger an out-of-bounds read error and read contents of memory on the system.


Affected software

macOS
iPadOS
Apple iOS
tvOS
visionOS
watchOS

How to mitigate CVE-2026-28920

Install updates 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