CVE-2025-43343
Publication date 15 September 2025
Last updated 29 October 2025
Ubuntu priority
Description
The issue was addressed with improved memory handling. This issue is fixed in tvOS 26, Safari 26, visionOS 26, watchOS 26, macOS Tahoe 26, iOS 26 and iPadOS 26. Processing maliciously crafted web content may lead to an unexpected process crash.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| webkitgtk | 25.10 questing | Not in release |
| 25.04 plucky | Not in release | |
| 24.04 LTS noble | Not in release | |
| 22.04 LTS jammy | Not in release | |
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial | Ignored | |
| webkit2gtk | 25.10 questing |
Needs evaluation
|
| 25.04 plucky |
Needs evaluation
|
|
| 24.04 LTS noble |
Needs evaluation
|
|
| 22.04 LTS jammy |
Needs evaluation
|
|
| 20.04 LTS focal | Ignored | |
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial | Ignored | |
| qtwebkit-source | 25.10 questing | Not in release |
| 25.04 plucky | Not in release | |
| 24.04 LTS noble | Not in release | |
| 22.04 LTS jammy | Not in release | |
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial | Ignored | |
| qtwebkit-opensource-src | 25.10 questing | Not in release |
| 25.04 plucky | Not in release | |
| 24.04 LTS noble | Ignored | |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Ignored | |
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial | Ignored | |
| wpewebkit | 25.10 questing | Not in release |
| 25.04 plucky | Not in release | |
| 24.04 LTS noble | Not in release | |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Ignored |
Notes
jdstrand
webkit receives limited support. For details, see https://wiki.ubuntu.com/SecurityTeam/FAQ#webkit webkit in Ubuntu uses the JavaScriptCore (JSC) engine, not V8
mdeslaur
It is no longer possible to build new webkit2gtk versions on focal and earlier. Marking as ignored. wpewebkit isn't used by anything of importance in the archive, except for cog, an example container for wpewebkit. There is no point in attempting to backport newer wpewebkit versions to the archive. As such, marking as ignored. It is not feasible to fix webkitgtk, qtwebkit-source, and qtwebkit-opensource-src. Marking them as ignored.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
9.8 · Critical
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |