critical 9.8

CVE-2025-43342 json

A correctness issue was addressed with improved checks.

published 2025-09-15 13 mo ago modified 2026-10-18 21 d ago also EUVD-2025-29308

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits: 0; none known

A correctness issue was addressed with improved checks. This issue is fixed in Safari 26, iOS 18.7 and iPadOS 18.7, iOS 26 and iPadOS 26, macOS Tahoe 26, tvOS 26, visionOS 26, watchOS 26. Processing maliciously crafted web content may lead to an unexpected process crash.

Patch / fix

fixed in 6 distros 7

Apple Safari 26
Apple iOS and iPadOS 18.7, 26
Apple macOS 26
Apple tvOS 26
Apple visionOS 26
Apple watchOS 26

debian ubuntu red hat suse opensuse almalinux rocky linux

wpewebkit Debian 14 2.50.0-1
webkit2gtk Debian 12 2.50.1-1~deb12u1
webkit2gtk Debian 13 2.50.1-1~deb13u1
webkit2gtk Debian 14 2.50.0-1

debian advisories DEBIAN-CVE-2025-43342

webkit2gtk Ubuntu 22.04 LTS 2.48.7-0ubuntu0.22.04.2
webkit2gtk Ubuntu 24.04 LTS 2.48.7-0ubuntu0.24.04.2
webkit2gtk Ubuntu 25.10 2.50.0-2ubuntu1

ubuntu advisories UBUNTU-CVE-2025-43342

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

webkit2gtk3 RHEL 9 2.50.1-1.el9_7
webkit2gtk3-jsc RHEL 9 2.50.1-1.el9_7
webkit2gtk3 RHEL 9 2.50.1-0.el9_6
webkit2gtk3-jsc RHEL 9 2.50.1-0.el9_6
webkit2gtk3 RHEL 8 2.50.0-1.el8_10
webkit2gtk3-jsc RHEL 8 2.50.0-1.el8_10
webkitgtk4 RHEL 7 ELS 2.50.0-1.el7_9
webkitgtk4-jsc RHEL 7 ELS 2.50.0-1.el7_9

red hat advisories RHSA-2025:20922 RHSA-2025:19352 RHSA-2025:19165 RHSA-2025:19157 RHSA-2025:19109 RHSA-2025:18097

webkit2gtk3 SLES for SAP applications 16.0, SLES 16.0 2.50.4-160000.1.1
webkit2gtk4 SLES for SAP applications 16.0, SLES 16.0 2.50.4-160000.1.1
webkit2gtk3 SLE Module for Desktop Applications 15 SP7, SLE Module for Desktop Applications 15 SP6, openSUSE Leap 15.6 2.50.1-150600.12.48.3
webkit2gtk4 SLE Module for Development Tools 15 SP7, SLE Module for Development Tools 15 SP6, SLE Module for Basesystem 15 SP7 +2 more 2.50.1-150600.12.48.3
webkit2gtk3-soup2 SLE Module for Basesystem 15 SP7, SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 2.50.1-150600.12.48.3
webkit2gtk3 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.50.1-150400.4.127.3
webkit2gtk4 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.50.1-150400.4.127.3
webkit2gtk3-soup2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +7 more 2.50.1-150400.4.127.3

suse advisories SUSE-SU-2026:20102-1 SUSE-SU-2025:3905-1 SUSE-SU-2025:3701-1 SUSE-SU-2025:3700-1

webkit2gtk3 openSUSE Leap 16.0 2.50.4-160000.1.1
webkit2gtk4 openSUSE Leap 16.0 2.50.4-160000.1.1
webkit2gtk3-soup2 openSUSE Leap 16.0 2.50.4-160000.1.1

opensuse advisories openSUSE-SU-2026:20065-1

webkit2gtk3 AlmaLinux 9 2.50.1-1.el9_7
webkit2gtk3-jsc AlmaLinux 9 2.50.1-1.el9_7
webkit2gtk3 AlmaLinux 9 2.50.1-0.el9_6
webkit2gtk3-jsc AlmaLinux 9 2.50.1-0.el9_6
webkit2gtk3 AlmaLinux 8 2.50.0-1.el8_10
webkit2gtk3-jsc AlmaLinux 8 2.50.0-1.el8_10

almalinux advisories ALSA-2025:20922 ALSA-2025:18097 ALSA-2025:17802

webkit2gtk3 Rocky Linux 9 2.50.1-1.el9_7
webkit2gtk3 Rocky Linux 9 2.50.1-0.el9_6
webkit2gtk3 Rocky Linux 8 2.50.0-1.el8_10

rocky linux advisories RLSA-2025:20922 RLSA-2025:18097 RLSA-2025:17802

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-43342 updated 2026-11-04 cvss 8.8

webkitgtk: Processing maliciously crafted web content may lead to an unexpected process crash

Red Hat Enterprise Linux 6 webkitgtk
affected: workaround, no fix planned “Out of support scope”
Red Hat Enterprise Linux AppStream (v. 8) webkit2gtk3 2.50.0-1.el8_10, webkit2gtk3-jsc 2.50.0-1.el8_10
fixed: vendor fix RHSA-2025:17802
Red Hat Enterprise Linux AppStream (v. 9) webkit2gtk3 2.50.1-0.el9_6, webkit2gtk3 2.50.1-1.el9_7, webkit2gtk3-jsc 2.50.1-0.el9_6, webkit2gtk3-jsc 2.50.1-1.el9_7
fixed: vendor fix RHSA-2025:18097
Red Hat Enterprise Linux AppStream AUS (v. 8.2) webkit2gtk3 2.50.0-1.el8_2, webkit2gtk3-jsc 2.50.0-1.el8_2
fixed: vendor fix RHSA-2025:19157
Red Hat Enterprise Linux AppStream AUS (v.8.4) webkit2gtk3 2.50.0-1.el8_4, webkit2gtk3-jsc 2.50.0-1.el8_4
fixed: vendor fix RHSA-2025:19165
Red Hat Enterprise Linux AppStream AUS (v.8.6) webkit2gtk3 2.50.0-1.el8_6, webkit2gtk3-jsc 2.50.0-1.el8_6 Red Hat Enterprise Linux AppStream E4S (v.8.6) webkit2gtk3 2.50.0-1.el8_6, webkit2gtk3-jsc 2.50.0-1.el8_6
fixed: vendor fix RHSA-2025:19109
Red Hat Enterprise Linux AppStream E4S (v.8.8) webkit2gtk3 2.50.0-1.el8_8.1, webkit2gtk3-jsc 2.50.0-1.el8_8.1
fixed: vendor fix RHSA-2025:17807
Red Hat Enterprise Linux AppStream E4S (v.9.0) webkit2gtk3 2.50.0-2.el9_0, webkit2gtk3-jsc 2.50.0-2.el9_0
fixed: vendor fix RHSA-2025:17643

show 7 more

Red Hat Enterprise Linux AppStream E4S (v.9.2) webkit2gtk3 2.50.0-2.el9_2, webkit2gtk3-jsc 2.50.0-2.el9_2
fixed: vendor fix RHSA-2025:17743
Red Hat Enterprise Linux AppStream EUS (v.9.4) webkit2gtk3 2.50.0-2.el9_4, webkit2gtk3-jsc 2.50.0-2.el9_4
fixed: vendor fix RHSA-2025:17741
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) webkit2gtk3 2.50.0-1.el8_4, webkit2gtk3-jsc 2.50.0-1.el8_4
fixed: vendor fix RHSA-2025:19165
Red Hat Enterprise Linux AppStream TUS (v.8.6) webkit2gtk3 2.50.0-1.el8_6, webkit2gtk3-jsc 2.50.0-1.el8_6
fixed: vendor fix RHSA-2025:19109
Red Hat Enterprise Linux AppStream TUS (v.8.8) webkit2gtk3 2.50.0-1.el8_8.1, webkit2gtk3-jsc 2.50.0-1.el8_8.1
fixed: vendor fix RHSA-2025:17807
Red Hat Enterprise Linux Server (v. 7 ELS) webkitgtk4 2.50.0-1.el7_9, webkitgtk4-jsc 2.50.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7 ELS) webkitgtk4-doc 2.50.0-1.el7_9, webkitgtk4-devel 2.50.0-1.el7_9, webkitgtk4-debuginfo 2.50.0-1.el7_9, webkitgtk4-jsc-devel 2.50.0-1.el7_9
fixed: vendor fix RHSA-2025:19352
Red Hat Enterprise Linux 7 webkitgtk3, libwebkit2gtk
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 13 mo ago (2025-09-16)

Exploit prediction

0.77% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Apple Safari
Apple iOS and iPadOS
Apple macOS
Apple tvOS
Apple visionOS
Apple watchOS

Classification

Weakness

CWE-20 Improper Input Validation

References

support.apple.com /en-us/125108
release-notes, vendor-advisory
support.apple.com /en-us/125109
release-notes, vendor-advisory
support.apple.com /en-us/125113
release-notes, vendor-advisory
support.apple.com /en-us/125114
release-notes, vendor-advisory
support.apple.com /en-us/125115
release-notes, vendor-advisory
support.apple.com /en-us/125116
release-notes, vendor-advisory
support.apple.com /en-us/125110
seclists.org /fulldisclosure/2025/Sep/57
mailing-list, third-party-advisory
seclists.org /fulldisclosure/2025/Sep/53
mailing-list, third-party-advisory
seclists.org /fulldisclosure/2025/Sep/59
mailing-list, third-party-advisory
seclists.org /fulldisclosure/2025/Sep/49
mailing-list, third-party-advisory
openwall.com /lists/oss-security/2025/09/22/3
mailing-list, third-party-advisory

Sources

CVE List CVE-2025-43342
NVD CVE-2025-43342

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary