CVE-2026-43734
published 2026-06-29CVE-2026-43734: A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 26.5.2, iOS 18.7.10 and iPadOS 18.7.10, iOS 26.5.2 and…
PriorityP432medium6.5CVSS 3.1
AVNACLPRNUIRSUCNINAH
EPSS
0.39%
32.8th percentile
A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 26.5.2, iOS 18.7.10 and iPadOS 18.7.10, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, watchOS 26.6. Processing maliciously crafted web content may lead to an unexpected process crash.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| apple | ios_and_ipados | < 18.7.10 | 18.7.10 |
| apple | ios_and_ipados | < 26.5.2 | 26.5.2 |
| apple | ipados | < 26.5.2 | 26.5.2 |
| apple | iphone_os | < 26.5.2 | 26.5.2 |
| apple | macos | < 26.5.2 | 26.5.2 |
| apple | macos | >= 26.0 < 26.5.2 | 26.5.2 |
| apple | safari | < 26.5.2 | 26.5.2 |
| apple | tvos | < 26.6 | 26.6 |
| apple | visionos | < 26.6 | 26.6 |
| apple | watchos | < 26.6 | 26.6 |
| ubuntu | webkit2gtk | — | — |
| webkitgtk | webkitgtk | — | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
vendor_redhat6.5MEDIUM
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Ubuntu
WebKitGTK vulnerabilities
vendor_ubuntu·2026-08-31
CVE-2026-43742 WebKitGTK vulnerabilities
Title: WebKitGTK vulnerabilities
Summary: Several security issues were fixed in WebKitGTK.
Several security issues were discovered in the WebKitGTK Web and JavaScript
engines. If a user were tricked into viewing a malicious website, a remote
attacker could exploit a variety of issues related to web browser security,
including cross-site scripting attacks, denial of service attacks, and
arbitrary code execution.
Instructions: This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart any applications
that use WebKitGTK, such as Epiphany, to make all the necessary changes.
Red Hat
webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
vendor_redhat·2026-07-10·CVSS 6.5
CVE-2026-43734 [MEDIUM] CWE-416 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may lead to an unexpected process crash.
A flaw was found in WebKitGTK. Processing maliciously crafted web content can trigger a use-after-free due to improper memory management, resulting in an unexpected process crash.
Package: pywebkitgtk (Red Hat Enterprise Linux 6) - Out of support scope
Package: webkitgtk (Red Hat Enterprise Linux 6) - Out of support scope
Package: webkitgtk3 (Red Hat Enterprise Linux 7) - Out of support scope
Package: webkitgtk4 (Red Hat Enterprise Linux 7) - Out of support s
VulDB
Apple Safari/iOS/iPadOS/macOS up to 26.5.1 Web use after free
vuldb·2026-06-30·CVSS 6.5
CVE-2026-43734 [MEDIUM] Apple Safari/iOS/iPadOS/macOS up to 26.5.1 Web use after free
A vulnerability categorized as critical has been discovered in Apple Safari, iOS, iPadOS and macOS up to 26.5.1. This impacts an unknown function of the component Web Handler. Executing a manipulation can lead to use after free.
This vulnerability is handled as CVE-2026-43734. The attack can be executed remotely. There is not any exploit available.
It is advisable to upgrade the affected component.
GHSA
A use-after-free issue was addressed with improved memory management.
ghsa_unreviewed·2026-06-29
CVE-2026-43734 [MEDIUM] CWE-416 A use-after-free issue was addressed with improved memory management.
A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may lead to an unexpected process crash.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-43734 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash [fedora-all]
bugzilla·2026-08-31·CVSS 6.5
CVE-2026-43734 [MEDIUM] CVE-2026-43734 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash [fedora-all]
CVE-2026-43734 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
A use-after-free issue was addressed with improved memory management.
Impact: maliciously crafted web content may cause unexpected process crash
Advisory: https://webkitgtk.org/security/WSA-2026-0004.html
WebKit Bug: https://bugs.webkit.org/show_bug.cgi?id=313693
Bugzilla
CVE-2026-43734 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash [epel-all]
bugzilla·2026-08-31·CVSS 6.5
CVE-2026-43734 [MEDIUM] CVE-2026-43734 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash [epel-all]
CVE-2026-43734 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
A use-after-free issue was addressed with improved memory management.
Impact: maliciously crafted web content may cause unexpected process crash
Advisory: https://webkitgtk.org/security/WSA-2026-0004.html
WebKit Bug: https://bugs.webkit.org/show_bug.cgi?id=313693
Bugzilla
CVE-2026-43734 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
bugzilla·2026-07-14·CVSS 6.5
CVE-2026-43734 [MEDIUM] CVE-2026-43734 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
CVE-2026-43734 webkitgtk: webkitgtk: Maliciously crafted web content may cause unexpected process crash
A use-after-free issue was addressed with improved memory management.
Impact: maliciously crafted web content may cause unexpected process crash
Advisory: https://webkitgtk.org/security/WSA-2026-0004.html
WebKit Bug: https://bugs.webkit.org/show_bug.cgi?id=313693
2026-06-29
Published