Use after free in macOS - CVE-2026-43734

Vulnerability identifier: #VU137089

CSH Severity: Medium

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-43734

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to a use-after-free error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected process crash.

macOS
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
Debian Linux
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
visionOS
Anolis OS
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Basesystem Module
Desktop Applications Module
Development Tools Module
openSUSE Leap
tvOS
iPadOS
Apple iOS
watchOS
Fedora
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
webkitgtk4 (Red Hat package)
webkit2gtk3 (Red Hat package)
webkitgtk
webkit2gtk (Debian package)
webkit2gtk3
webkit2gtk3-devel
webkit2gtk3-jsc
webkit2gtk3-jsc-devel
libwebkit2gtk-4_0-37
webkit2gtk-4_0-injected-bundles
typelib-1_0-WebKit2WebExtension-4_0
webkit2gtk3-debugsource
webkit2gtk-4_0-injected-bundles-debuginfo
typelib-1_0-JavaScriptCore-4_0
typelib-1_0-WebKit2-4_0
libjavascriptcoregtk-4_0-18-debuginfo
libwebkit2gtk-4_0-37-debuginfo
libjavascriptcoregtk-4_0-18
libwebkit2gtk3-lang
webkit2gtk4-debugsource
webkitgtk-6_0-injected-bundles
libwebkitgtk-6_0-4-debuginfo
webkit2gtk-4_1-injected-bundles
libwebkit2gtk-4_1-0
webkit2gtk4-minibrowser
libjavascriptcoregtk-4_1-0
libwebkit2gtk-4_1-0-debuginfo
webkit2gtk3-soup2-minibrowser-debuginfo
webkit2gtk3-soup2-devel
webkit2gtk3-soup2-debugsource
webkit-jsc-4
webkit-jsc-6.0-debuginfo
webkit-jsc-4.1-debuginfo
webkit2gtk4-devel
webkit2gtk4-minibrowser-debuginfo
libjavascriptcoregtk-6_0-1
webkit-jsc-4-debuginfo
webkit-jsc-6.0
libjavascriptcoregtk-4_1-0-debuginfo
typelib-1_0-JavaScriptCore-6_0
typelib-1_0-WebKit2-4_1
typelib-1_0-WebKit-6_0
libwebkitgtk-6_0-4
typelib-1_0-WebKit2WebExtension-4_1
typelib-1_0-JavaScriptCore-4_1
libwebkit2gtk-4_0-37-32bit-debuginfo
libjavascriptcoregtk-4_1-0-32bit-debuginfo
libjavascriptcoregtk-4_1-0-32bit
libjavascriptcoregtk-4_0-18-32bit
libwebkit2gtk-4_0-37-32bit
libwebkit2gtk-4_1-0-32bit
libjavascriptcoregtk-4_0-18-32bit-debuginfo
libwebkit2gtk-4_1-0-32bit-debuginfo
WebKitGTK-4.1-lang
WebKitGTK-6.0-lang
WebKitGTK-4.0-lang
libjavascriptcoregtk-4_0-18-64bit-debuginfo
libjavascriptcoregtk-4_1-0-64bit-debuginfo
libwebkit2gtk-4_1-0-64bit-debuginfo
libjavascriptcoregtk-4_0-18-64bit
libwebkit2gtk-4_0-37-64bit
webkit2gtk3-minibrowser
webkit2gtk-4_1-injected-bundles-debuginfo
typelib-1_0-WebKitWebProcessExtension-6_0
libjavascriptcoregtk-6_0-1-debuginfo
webkit2gtk3-minibrowser-debuginfo
webkitgtk-6_0-injected-bundles-debuginfo
webkit-jsc-4.1
webkit2gtk3-soup2-minibrowser
libwebkit2gtk-4_1-0-64bit
libwebkit2gtk-4_0-37-64bit-debuginfo
libjavascriptcoregtk-4_1-0-64bit
Apple Safari

Install update from vendor's website.

macOS - update to 26.5.2 25F84
visionOS - update to 26.6
tvOS - update to 26.6 23L773
iPadOS - addressed in versions 18.7.10 22H374, 26.5.2 23F84
Apple iOS - addressed in versions 18.7.10 22H374, 26.5.2 23F84
Apple Safari - update to 26.5.2
watchOS - update to 26.6 23U67
webkitgtk4 (Red Hat package) - update to 2.52.5-1.el7_9
webkit2gtk3 (Red Hat package) - addressed in versions 2.52.5-1.el8_4, 2.52.5-1.el8_6, 2.52.5-1.el8_8, 2.52.5-1.el8_10, 2.52.5-1.el9_4, 2.52.5-1.el9_6
webkitgtk - addressed in versions 2.52.5-1.fc43, 2.52.5-1.fc44
webkit2gtk (Debian package) - update to 2.52.5-1~deb13u1
webkit2gtk3 - update to 2.52.5-1.0.1
webkit2gtk3-devel - update to 2.52.5-1.0.1
webkit2gtk3-jsc - update to 2.52.5-1.0.1
webkit2gtk3-jsc-devel - update to 2.52.5-1.0.1
libwebkit2gtk-4_0-37 - addressed in versions 2.52.5-4.63.2, 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit2gtk-4_0-injected-bundles - addressed in versions 2.52.5-4.63.2, 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
typelib-1_0-WebKit2WebExtension-4_0 - addressed in versions 2.52.5-4.63.2, 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit2gtk3-devel - addressed in versions 2.52.5-4.63.2, 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit2gtk3-debugsource - addressed in versions 2.52.5-4.63.2, 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit2gtk-4_0-injected-bundles-debuginfo - addressed in versions 2.52.5-4.63.2, 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
typelib-1_0-JavaScriptCore-4_0 - addressed in versions 2.52.5-4.63.2, 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
typelib-1_0-WebKit2-4_0 - addressed in versions 2.52.5-4.63.2, 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libjavascriptcoregtk-4_0-18-debuginfo - addressed in versions 2.52.5-4.63.2, 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libwebkit2gtk-4_0-37-debuginfo - addressed in versions 2.52.5-4.63.2, 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libjavascriptcoregtk-4_0-18 - addressed in versions 2.52.5-4.63.2, 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libwebkit2gtk3-lang - update to 2.52.5-4.63.2
webkit2gtk4-debugsource - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkitgtk-6_0-injected-bundles - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libwebkitgtk-6_0-4-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit2gtk-4_1-injected-bundles - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libwebkit2gtk-4_1-0 - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit2gtk4-minibrowser - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libjavascriptcoregtk-4_1-0 - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libwebkit2gtk-4_1-0-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit2gtk3-soup2-minibrowser-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit2gtk3-soup2-devel - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit2gtk3-soup2-debugsource - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit-jsc-4 - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit-jsc-6.0-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit-jsc-4.1-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit2gtk4-devel - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit2gtk4-minibrowser-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libjavascriptcoregtk-6_0-1 - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit-jsc-4-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit-jsc-6.0 - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libjavascriptcoregtk-4_1-0-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
typelib-1_0-JavaScriptCore-6_0 - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
typelib-1_0-WebKit2-4_1 - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
typelib-1_0-WebKit-6_0 - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libwebkitgtk-6_0-4 - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
typelib-1_0-WebKit2WebExtension-4_1 - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
typelib-1_0-JavaScriptCore-4_1 - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libwebkit2gtk-4_0-37-32bit-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libjavascriptcoregtk-4_1-0-32bit-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libjavascriptcoregtk-4_1-0-32bit - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libjavascriptcoregtk-4_0-18-32bit - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libwebkit2gtk-4_0-37-32bit - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libwebkit2gtk-4_1-0-32bit - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libjavascriptcoregtk-4_0-18-32bit-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libwebkit2gtk-4_1-0-32bit-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
WebKitGTK-4.1-lang - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
WebKitGTK-6.0-lang - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
WebKitGTK-4.0-lang - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libjavascriptcoregtk-4_0-18-64bit-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libjavascriptcoregtk-4_1-0-64bit-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libwebkit2gtk-4_1-0-64bit-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libjavascriptcoregtk-4_0-18-64bit - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libwebkit2gtk-4_0-37-64bit - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit2gtk3-minibrowser - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit2gtk-4_1-injected-bundles-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
typelib-1_0-WebKitWebProcessExtension-6_0 - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libjavascriptcoregtk-6_0-1-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit2gtk3-minibrowser-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkitgtk-6_0-injected-bundles-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit-jsc-4.1 - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
webkit2gtk3-soup2-minibrowser - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libwebkit2gtk-4_1-0-64bit - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libwebkit2gtk-4_0-37-64bit-debuginfo - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1
libjavascriptcoregtk-4_1-0-64bit - addressed in versions 2.52.5-150400.4.146.1, 2.52.5-150600.12.71.1

• https://support.apple.com/en-us/127595

• Multiple vulnerabilities in Apple macOS Tahoe
• Fedora 43 update for webkitgtk
• Fedora 44 update for webkitgtk
• Red Hat Enterprise Linux 8 update for webkit2gtk3
• Anolis OS update for webkit2gtk3
• Debian update for webkit2gtk
• SUSE update for webkit2gtk3
• SUSE update for webkit2gtk3
• SUSE update for webkit2gtk3
• Red Hat Enterprise Linux 9 update for webkit2gtk3
• Red Hat Enterprise Linux 9 update for webkit2gtk3
• Multiple vulnerabilities in Apple visionOS
• Multiple vulnerabilities in Apple tvOS
• Multiple vulnerabilities in Apple watchOS
• Multiple vulnerabilities in iOS 26 and iPadOS 26
• Multiple vulnerabilities in Apple Safari
• Multiple vulnerabilities in iOS 18 and iPadOS 18
• Red Hat Enterprise Linux 8 update for webkit2gtk3
• Red Hat Enterprise Linux 7 Extended Lifecycle Support update for webkitgtk4
• Red Hat Enterprise Linux 8 update for webkit2gtk3
• Red Hat Enterprise Linux 8 update for webkit2gtk3