Out-of-bounds write in WebKitGTK+ and WPE WebKit - CVE-2026-64719

Vulnerability identifier: #VU143698

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-2026-64719

CWE-ID: CWE-787

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to out-of-bounds access in WebRTC when processing maliciously crafted web content. A remote attacker can send maliciously crafted web content to cause a denial of service.

User interaction is required to process the crafted web content.

WebKitGTK+
WPE WebKit
Debian Linux
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
visionOS
Development Tools Module
Desktop Applications Module
Basesystem Module
openSUSE Leap
tvOS
Apple iOS
iPadOS
Ubuntu
macOS
watchOS
Apple Safari
webkit2gtk (Ubuntu package)
webkit2gtk (Debian package)
libjavascriptcoregtk-4_1-0-32bit-debuginfo
libjavascriptcoregtk-4_1-0-32bit
typelib-1_0-JavaScriptCore-4_1
typelib-1_0-WebKitWebProcessExtension-6_0
webkit2gtk-4_0-injected-bundles-debuginfo
libjavascriptcoregtk-6_0-1-debuginfo
webkit2gtk-4_1-injected-bundles-debuginfo
libjavascriptcoregtk-4_0-18
webkit2gtk3-soup2-devel
webkit-jsc-4.1
webkit2gtk3-debugsource
webkit2gtk4-debugsource
webkitgtk-6_0-injected-bundles
libwebkit2gtk-4_0-37
webkit-jsc-6.0
webkit2gtk3-soup2-minibrowser
typelib-1_0-WebKit2WebExtension-4_0
libwebkitgtk-6_0-4-debuginfo
libjavascriptcoregtk-4_1-0-debuginfo
WebKitGTK-6.0-lang
libjavascriptcoregtk-4_1-0-64bit
libjavascriptcoregtk-4_0-18-64bit-debuginfo
libwebkit2gtk-4_0-37-64bit
libjavascriptcoregtk-4_1-0-64bit-debuginfo
libwebkit2gtk-4_1-0-64bit-debuginfo
libjavascriptcoregtk-4_0-18-64bit
libwebkit2gtk-4_0-37-64bit-debuginfo
libwebkit2gtk-4_1-0-64bit
libwebkit2gtk-4_1-0-32bit
WebKitGTK-4.0-lang
WebKitGTK-4.1-lang
libjavascriptcoregtk-4_0-18-32bit
libjavascriptcoregtk-4_0-18-32bit-debuginfo
libwebkit2gtk-4_1-0-32bit-debuginfo
libwebkit2gtk-4_0-37-32bit
libwebkit2gtk-4_0-37-32bit-debuginfo
webkit-jsc-4
libjavascriptcoregtk-6_0-1
webkitgtk-6_0-injected-bundles-debuginfo
typelib-1_0-WebKit2-4_0
libjavascriptcoregtk-4_1-0
typelib-1_0-JavaScriptCore-4_0
typelib-1_0-JavaScriptCore-6_0
webkit2gtk3-soup2-debugsource
libjavascriptcoregtk-4_0-18-debuginfo
libwebkit2gtk-4_0-37-debuginfo
webkit-jsc-4.1-debuginfo
typelib-1_0-WebKit2-4_1
libwebkit2gtk-4_1-0
webkit2gtk4-minibrowser
webkit2gtk3-soup2-minibrowser-debuginfo
typelib-1_0-WebKit-6_0
webkit-jsc-6.0-debuginfo
webkit2gtk-4_1-injected-bundles
webkit2gtk-4_0-injected-bundles
webkit2gtk3-devel
libwebkitgtk-6_0-4
libwebkit2gtk-4_1-0-debuginfo
typelib-1_0-WebKit2WebExtension-4_1
webkit2gtk4-devel
webkit2gtk3-minibrowser
webkit2gtk3-minibrowser-debuginfo
webkit-jsc-4-debuginfo
webkit2gtk4-minibrowser-debuginfo

Install security update from vendor's website.

WebKitGTK+ - update to 2.52.6
WPE WebKit - update to 2.52.6
visionOS - update to 26.6
tvOS - update to 26.6 23L773
Apple iOS - addressed in versions 18.7.10 22H374, 26.6 23G71
iPadOS - addressed in versions 18.7.10 22H374, 26.6 23G71
macOS - update to 26.6 25G72
Apple Safari - update to 26.6
watchOS - update to 26.6 23U67
webkit2gtk (Ubuntu package) - addressed in versions 2.52.6-0ubuntu0.24.04.1, 2.52.6-0ubuntu0.26.04.1
webkit2gtk (Debian package) - update to 2.52.6-1~deb13u1
libjavascriptcoregtk-4_1-0-32bit-debuginfo - update to 2.52.6-150600.12.74.1
libjavascriptcoregtk-4_1-0-32bit - update to 2.52.6-150600.12.74.1
typelib-1_0-JavaScriptCore-4_1 - update to 2.52.6-150600.12.74.1
typelib-1_0-WebKitWebProcessExtension-6_0 - update to 2.52.6-150600.12.74.1
webkit2gtk-4_0-injected-bundles-debuginfo - update to 2.52.6-150600.12.74.1
libjavascriptcoregtk-6_0-1-debuginfo - update to 2.52.6-150600.12.74.1
webkit2gtk-4_1-injected-bundles-debuginfo - update to 2.52.6-150600.12.74.1
libjavascriptcoregtk-4_0-18 - update to 2.52.6-150600.12.74.1
webkit2gtk3-soup2-devel - update to 2.52.6-150600.12.74.1
webkit-jsc-4.1 - update to 2.52.6-150600.12.74.1
webkit2gtk3-debugsource - update to 2.52.6-150600.12.74.1
webkit2gtk4-debugsource - update to 2.52.6-150600.12.74.1
webkitgtk-6_0-injected-bundles - update to 2.52.6-150600.12.74.1
libwebkit2gtk-4_0-37 - update to 2.52.6-150600.12.74.1
webkit-jsc-6.0 - update to 2.52.6-150600.12.74.1
webkit2gtk3-soup2-minibrowser - update to 2.52.6-150600.12.74.1
typelib-1_0-WebKit2WebExtension-4_0 - update to 2.52.6-150600.12.74.1
libwebkitgtk-6_0-4-debuginfo - update to 2.52.6-150600.12.74.1
libjavascriptcoregtk-4_1-0-debuginfo - update to 2.52.6-150600.12.74.1
WebKitGTK-6.0-lang - update to 2.52.6-150600.12.74.1
libjavascriptcoregtk-4_1-0-64bit - update to 2.52.6-150600.12.74.1
libjavascriptcoregtk-4_0-18-64bit-debuginfo - update to 2.52.6-150600.12.74.1
libwebkit2gtk-4_0-37-64bit - update to 2.52.6-150600.12.74.1
libjavascriptcoregtk-4_1-0-64bit-debuginfo - update to 2.52.6-150600.12.74.1
libwebkit2gtk-4_1-0-64bit-debuginfo - update to 2.52.6-150600.12.74.1
libjavascriptcoregtk-4_0-18-64bit - update to 2.52.6-150600.12.74.1
libwebkit2gtk-4_0-37-64bit-debuginfo - update to 2.52.6-150600.12.74.1
libwebkit2gtk-4_1-0-64bit - update to 2.52.6-150600.12.74.1
libwebkit2gtk-4_1-0-32bit - update to 2.52.6-150600.12.74.1
WebKitGTK-4.0-lang - update to 2.52.6-150600.12.74.1
WebKitGTK-4.1-lang - update to 2.52.6-150600.12.74.1
libjavascriptcoregtk-4_0-18-32bit - update to 2.52.6-150600.12.74.1
libjavascriptcoregtk-4_0-18-32bit-debuginfo - update to 2.52.6-150600.12.74.1
libwebkit2gtk-4_1-0-32bit-debuginfo - update to 2.52.6-150600.12.74.1
libwebkit2gtk-4_0-37-32bit - update to 2.52.6-150600.12.74.1
libwebkit2gtk-4_0-37-32bit-debuginfo - update to 2.52.6-150600.12.74.1
webkit-jsc-4 - update to 2.52.6-150600.12.74.1
libjavascriptcoregtk-6_0-1 - update to 2.52.6-150600.12.74.1
webkitgtk-6_0-injected-bundles-debuginfo - update to 2.52.6-150600.12.74.1
typelib-1_0-WebKit2-4_0 - update to 2.52.6-150600.12.74.1
libjavascriptcoregtk-4_1-0 - update to 2.52.6-150600.12.74.1
typelib-1_0-JavaScriptCore-4_0 - update to 2.52.6-150600.12.74.1
typelib-1_0-JavaScriptCore-6_0 - update to 2.52.6-150600.12.74.1
webkit2gtk3-soup2-debugsource - update to 2.52.6-150600.12.74.1
libjavascriptcoregtk-4_0-18-debuginfo - update to 2.52.6-150600.12.74.1
libwebkit2gtk-4_0-37-debuginfo - update to 2.52.6-150600.12.74.1
webkit-jsc-4.1-debuginfo - update to 2.52.6-150600.12.74.1
typelib-1_0-WebKit2-4_1 - update to 2.52.6-150600.12.74.1
libwebkit2gtk-4_1-0 - update to 2.52.6-150600.12.74.1
webkit2gtk4-minibrowser - update to 2.52.6-150600.12.74.1
webkit2gtk3-soup2-minibrowser-debuginfo - update to 2.52.6-150600.12.74.1
typelib-1_0-WebKit-6_0 - update to 2.52.6-150600.12.74.1
webkit-jsc-6.0-debuginfo - update to 2.52.6-150600.12.74.1
webkit2gtk-4_1-injected-bundles - update to 2.52.6-150600.12.74.1
webkit2gtk-4_0-injected-bundles - update to 2.52.6-150600.12.74.1
webkit2gtk3-devel - update to 2.52.6-150600.12.74.1
libwebkitgtk-6_0-4 - update to 2.52.6-150600.12.74.1
libwebkit2gtk-4_1-0-debuginfo - update to 2.52.6-150600.12.74.1
typelib-1_0-WebKit2WebExtension-4_1 - update to 2.52.6-150600.12.74.1
webkit2gtk4-devel - update to 2.52.6-150600.12.74.1
webkit2gtk3-minibrowser - update to 2.52.6-150600.12.74.1
webkit2gtk3-minibrowser-debuginfo - update to 2.52.6-150600.12.74.1
webkit-jsc-4-debuginfo - update to 2.52.6-150600.12.74.1
webkit2gtk4-minibrowser-debuginfo - update to 2.52.6-150600.12.74.1

• https://support.apple.com/en-us/128073
• https://bugs.webkit.org/show_bug.cgi?id=319404
• https://webkitgtk.org/security/WSA-2026-0005.html

• Multiple vulnerabilities in WebKitGTK+ and WPE WebKit
• Multiple vulnerabilities in Apple Safari
• Multiple vulnerabilities in macOS Tahoe
• Multiple vulnerabilities in iOS 26 and iPadOS 26
• Multiple vulnerabilities in Apple visionOS
• Multiple vulnerabilities in Apple tvOS
• Multiple vulnerabilities in Apple watchOS
• Multiple vulnerabilities in iOS 18 and iPadOS 18
• Debian update for webkit2gtk
• Ubuntu update for webkit2gtk
• SUSE update for webkit2gtk3