Information disclosure in WebKitGTK+ and WPE WebKit - CVE-2026-20691

Vulnerability identifier: #VU124406

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:L/SI:N/SA:N]

CVE-ID: CVE-2026-20691

CWE-ID: CWE-200

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to excessive data output by the WebKit Sandboxing component. A remote attacker can gain fingerprint the user. 

WebKitGTK+
WPE WebKit
Debian Linux
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
Anolis OS
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Development Tools Module
Desktop Applications Module
Basesystem Module
openSUSE Leap
Ubuntu
macOS
iPadOS
Apple iOS
visionOS
watchOS
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
javascriptcoregtk4.1-devel
webkitgtk6.0-devel
webkitgtk6.0
webkit2gtk4.1-devel
webkit2gtk4.1
javascriptcoregtk6.0-devel
webkit2gtk4.1-doc
webkitgtk6.0-doc
javascriptcoregtk4.1
javascriptcoregtk6.0
webkit2gtk (Debian package)
webkit2gtk-4_0-injected-bundles
libjavascriptcoregtk-4_0-18
webkit2gtk3-debugsource
typelib-1_0-WebKit2-4_0
typelib-1_0-JavaScriptCore-4_0
webkit2gtk3-devel
typelib-1_0-WebKit2WebExtension-4_0
libjavascriptcoregtk-4_0-18-debuginfo
libwebkit2gtk-4_0-37
libwebkit2gtk-4_0-37-debuginfo
webkit2gtk-4_0-injected-bundles-debuginfo
libwebkit2gtk3-lang
webkit-jsc-4.1-debuginfo
libjavascriptcoregtk-4_1-0
libjavascriptcoregtk-6_0-1
typelib-1_0-WebKit2WebExtension-4_1
libjavascriptcoregtk-4_1-0-debuginfo
libjavascriptcoregtk-6_0-1-debuginfo
webkitgtk-6_0-injected-bundles-debuginfo
typelib-1_0-JavaScriptCore-4_1
webkit-jsc-6.0-debuginfo
webkit2gtk3-soup2-debugsource
libwebkitgtk-6_0-4
libwebkit2gtk-4_1-0
webkit2gtk4-minibrowser-debuginfo
libwebkit2gtk-4_1-0-debuginfo
webkit2gtk4-debugsource
WebKitGTK-4.1-lang
WebKitGTK-6.0-lang
WebKitGTK-4.0-lang
webkit-jsc-4-debuginfo
webkit2gtk4-minibrowser
libwebkitgtk-6_0-4-debuginfo
webkit2gtk-4_1-injected-bundles
webkit2gtk4-devel
webkit-jsc-4
webkit2gtk3-soup2-minibrowser-debuginfo
typelib-1_0-JavaScriptCore-6_0
webkit2gtk-4_1-injected-bundles-debuginfo
webkit2gtk3-soup2-minibrowser
typelib-1_0-WebKit2-4_1
libwebkit2gtk-4_1-0-64bit-debuginfo
libwebkit2gtk-4_1-0-64bit
libjavascriptcoregtk-4_1-0-64bit-debuginfo
libjavascriptcoregtk-4_0-18-64bit
libwebkit2gtk-4_0-37-64bit-debuginfo
libjavascriptcoregtk-4_0-18-64bit-debuginfo
libjavascriptcoregtk-4_1-0-64bit
libwebkit2gtk-4_0-37-64bit
libwebkit2gtk-4_0-37-32bit
libjavascriptcoregtk-4_1-0-32bit-debuginfo
libjavascriptcoregtk-4_1-0-32bit
libwebkit2gtk-4_1-0-32bit-debuginfo
libjavascriptcoregtk-4_0-18-32bit
libwebkit2gtk-4_1-0-32bit
libwebkit2gtk-4_0-37-32bit-debuginfo
typelib-1_0-WebKit-6_0
typelib-1_0-WebKitWebProcessExtension-6_0
webkitgtk-6_0-injected-bundles
webkit2gtk3-minibrowser
webkit-jsc-4.1
webkit2gtk3-minibrowser-debuginfo
webkit2gtk3-soup2-devel
webkit-jsc-6.0
libjavascriptcoregtk-4_0-18-32bit-debuginfo
webkit2gtk3 (Red Hat package)
webkit2gtk (Ubuntu package)
webkitgtk4 (Red Hat package)
webkit2gtk3-jsc-devel
webkit2gtk3-jsc
webkit2gtk3
Apple Safari

Install updates from vendor's website.

macOS - update to 26.4 25E246
Apple Safari - update to 26.4
iPadOS - update to 26.4 23E246
Apple iOS - update to 26.4 23E246
visionOS - update to 26.4
watchOS - update to 26.4 23T240
javascriptcoregtk4.1-devel - update to 2.52.1-1
webkitgtk6.0-devel - update to 2.52.1-1
webkitgtk6.0 - update to 2.52.1-1
webkit2gtk4.1-devel - update to 2.52.1-1
webkit2gtk4.1 - update to 2.52.1-1
javascriptcoregtk6.0-devel - update to 2.52.1-1
webkit2gtk4.1-doc - update to 2.52.1-1
webkitgtk6.0-doc - update to 2.52.1-1
javascriptcoregtk4.1 - update to 2.52.1-1
javascriptcoregtk6.0 - update to 2.52.1-1
webkit2gtk (Debian package) - update to 2.52.1-1~deb13u1
webkit2gtk-4_0-injected-bundles - addressed in versions 2.52.1-4.57.1, 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libjavascriptcoregtk-4_0-18 - addressed in versions 2.52.1-4.57.1, 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk3-debugsource - addressed in versions 2.52.1-4.57.1, 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
typelib-1_0-WebKit2-4_0 - addressed in versions 2.52.1-4.57.1, 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
typelib-1_0-JavaScriptCore-4_0 - addressed in versions 2.52.1-4.57.1, 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk3-devel - addressed in versions 2.52.1-4.57.1, 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
typelib-1_0-WebKit2WebExtension-4_0 - addressed in versions 2.52.1-4.57.1, 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libjavascriptcoregtk-4_0-18-debuginfo - addressed in versions 2.52.1-4.57.1, 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libwebkit2gtk-4_0-37 - addressed in versions 2.52.1-4.57.1, 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libwebkit2gtk-4_0-37-debuginfo - addressed in versions 2.52.1-4.57.1, 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk-4_0-injected-bundles-debuginfo - addressed in versions 2.52.1-4.57.1, 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libwebkit2gtk3-lang - update to 2.52.1-4.57.1
webkit-jsc-4.1-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libjavascriptcoregtk-4_1-0 - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libjavascriptcoregtk-6_0-1 - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
typelib-1_0-WebKit2WebExtension-4_1 - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libjavascriptcoregtk-4_1-0-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libjavascriptcoregtk-6_0-1-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkitgtk-6_0-injected-bundles-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
typelib-1_0-JavaScriptCore-4_1 - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit-jsc-6.0-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk3-soup2-debugsource - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libwebkitgtk-6_0-4 - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libwebkit2gtk-4_1-0 - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk4-minibrowser-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libwebkit2gtk-4_1-0-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk4-debugsource - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
WebKitGTK-4.1-lang - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
WebKitGTK-6.0-lang - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
WebKitGTK-4.0-lang - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit-jsc-4-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk4-minibrowser - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libwebkitgtk-6_0-4-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk-4_1-injected-bundles - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk4-devel - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit-jsc-4 - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk3-soup2-minibrowser-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
typelib-1_0-JavaScriptCore-6_0 - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk-4_1-injected-bundles-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk3-soup2-minibrowser - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
typelib-1_0-WebKit2-4_1 - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libwebkit2gtk-4_1-0-64bit-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libwebkit2gtk-4_1-0-64bit - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libjavascriptcoregtk-4_1-0-64bit-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libjavascriptcoregtk-4_0-18-64bit - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libwebkit2gtk-4_0-37-64bit-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libjavascriptcoregtk-4_0-18-64bit-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libjavascriptcoregtk-4_1-0-64bit - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libwebkit2gtk-4_0-37-64bit - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libwebkit2gtk-4_0-37-32bit - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libjavascriptcoregtk-4_1-0-32bit-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libjavascriptcoregtk-4_1-0-32bit - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libwebkit2gtk-4_1-0-32bit-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libjavascriptcoregtk-4_0-18-32bit - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libwebkit2gtk-4_1-0-32bit - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libwebkit2gtk-4_0-37-32bit-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
typelib-1_0-WebKit-6_0 - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
typelib-1_0-WebKitWebProcessExtension-6_0 - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkitgtk-6_0-injected-bundles - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk3-minibrowser - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit-jsc-4.1 - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk3-minibrowser-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk3-soup2-devel - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit-jsc-6.0 - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
libjavascriptcoregtk-4_0-18-32bit-debuginfo - addressed in versions 2.52.1-150400.4.140.2, 2.52.1-150600.12.63.1
webkit2gtk3 (Red Hat package) - addressed in versions 2.52.3-0.el9_7.1, 2.52.3-1.el8_4, 2.52.3-1.el8_6, 2.52.3-1.el8_8, 2.52.3-1.el8_10, 2.52.3-1.el9_0, 2.52.3-1.el9_2, 2.52.3-1.el9_4, 2.52.3-1.el9_6
webkit2gtk (Ubuntu package) - addressed in versions 2.52.3-0ubuntu0.24.04.1, 2.52.3-0ubuntu0.25.10.1, 2.52.3-0ubuntu0.26.04.2
webkitgtk4 (Red Hat package) - update to 2.52.3-1.el7_9
webkit2gtk3-jsc-devel - update to 2.52.3-1.0.1
webkit2gtk3-jsc - update to 2.52.3-1.0.1
webkit2gtk3-devel - update to 2.52.3-1.0.1
webkit2gtk3 - update to 2.52.3-1.0.1

• https://support.apple.com/en-us/126794
• https://webkitgtk.org/security/WSA-2026-0002.html

• Multiple vulnerabilities in WebKitGTK+ and WPE WebKit
• Multiple vulnerabilities in Apple macOS Tahoe
• Multiple vulnerabilities in Apple Safari
• Multiple vulnerabilities in Apple iOS 26 and iPadOS 26
• Multiple vulnerabilities in Apple watchOS
• Multiple vulnerabilities in Apple visionOS
• SUSE update for webkit2gtk3
• Red Hat Enterprise Linux 9 update for webkit2gtk3
• Red Hat Enterprise Linux 8 update for webkit2gtk3
• Red Hat Enterprise Linux 9 update for webkit2gtk3
• SUSE update for webkit2gtk3
• Red Hat Enterprise Linux 8 update for webkit2gtk3
• Red Hat Enterprise Linux 8 update for webkit2gtk3
• Red Hat Enterprise Linux 9 update for webkit2gtk3
• Ubuntu update for webkit2gtk
• SUSE update for webkit2gtk3
• Anolis OS update for webkit2gtk3
• Red Hat Enterprise Linux 8 update for webkit2gtk3
• Red Hat Enterprise Linux 9 update for webkit2gtk3
• Anolis OS update for webkitgtk
• Debian update for webkit2gtk
• Red Hat Enterprise Linux 9 update for webkit2gtk3
• Red Hat Enterprise Linux 7 Extended Lifecycle Support update for webkitgtk4