high 8.8

CVE-2025-43529 kev in the critical feed json

A use-after-free issue was addressed with improved memory management.

published 2025-12-17 10 mo ago modified 2026-10-07 32 d ago also EUVD-2025-203963

cvss: 8.8; version 3.1, CNA
cisa kev: Exploited; added 2025-12-15
epss: 25.7%; EPSS 25.7% chance of exploitation in 30 days, percentile 97%
public exploits: 0; none known

A use-after-free issue was addressed with improved memory management. This issue is fixed in Safari 26.2, iOS 18.7.3 and iPadOS 18.7.3, iOS 26.2 and iPadOS 26.2, macOS Tahoe 26.2, tvOS 26.2, visionOS 26.2, watchOS 26.2. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals on versions of iOS before iOS 26. CVE-2025-14174 was also issued in response to this report.

Patch / fix

cisa required action Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

fixed in 6 distros 7

Apple Safari 26.2
Apple iOS and iPadOS 18.7.3, 26.2
Apple macOS 26.2
Apple tvOS 26.2
Apple visionOS 26.2
Apple watchOS 26.2

debian ubuntu red hat suse opensuse almalinux rocky linux

wpewebkit Debian 14 2.50.4-1
webkit2gtk Debian 12 2.50.4-1~deb12u1
webkit2gtk Debian 13 2.50.4-1~deb13u1
webkit2gtk Debian 14 2.50.4-1

debian advisories DEBIAN-CVE-2025-43529

webkit2gtk Ubuntu 22.04 LTS 2.50.4-0ubuntu0.22.04.1
webkit2gtk Ubuntu 24.04 LTS 2.50.4-0ubuntu0.24.04.1
webkit2gtk Ubuntu 25.10 2.50.4-0ubuntu0.25.10.1

ubuntu advisories UBUNTU-CVE-2025-43529

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 2.50.4-1.el9_7
webkit2gtk3-jsc RHEL 9 2.50.4-1.el9_7
webkit2gtk3 RHEL 8 2.50.4-1.el8_10
webkit2gtk3-jsc RHEL 8 2.50.4-1.el8_10
webkit2gtk3 RHEL 9.6 EUS 2.50.4-1.el9_6
webkit2gtk3-jsc RHEL 9.6 EUS 2.50.4-1.el9_6
webkitgtk4 RHEL 7 ELS 2.50.4-2.el7_9
webkitgtk4-jsc RHEL 7 ELS 2.50.4-2.el7_9

red hat advisories RHSA-2025:23974 RHSA-2025:23975 RHSA-2025:23972 RHSA-2025:23973 RHSA-2025:23970 RHSA-2025:23971

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 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Desktop Applications 15 SP7 +2 more 2.50.4-150600.12.54.1
webkit2gtk4 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 +4 more 2.50.4-150600.12.54.1
webkit2gtk3-soup2 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 +2 more 2.50.4-150600.12.54.1
webkit2gtk3 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.50.4-150400.4.134.2
webkit2gtk4 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.50.4-150400.4.134.2
webkit2gtk3-soup2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +7 more 2.50.4-150400.4.134.1

suse advisories SUSE-SU-2026:20102-1 SUSE-SU-2026:0021-1 SUSE-SU-2025:4528-1 SUSE-SU-2025:4527-1

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 8 2.50.4-1.el8_10
webkit2gtk3-jsc AlmaLinux 8 2.50.4-1.el8_10
webkit2gtk3 AlmaLinux 9 2.50.4-1.el9_7
webkit2gtk3-jsc AlmaLinux 9 2.50.4-1.el9_7

almalinux advisories ALSA-2025:23663 ALSA-2025:23700

webkit2gtk3 Rocky Linux 9 2.50.4-1.el9_7
webkit2gtk3 Rocky Linux 8 2.50.4-1.el8_10

rocky linux advisories RLSA-2025:23700 RLSA-2025:23663

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-2025-43529 updated 2026-11-04 cvss 8.8

webkitgtk: webkitgtk: Use-after-free due to improper memory management

Red Hat Enterprise Linux 6 webkitgtk, pywebkitgtk
affected: workaround, no fix planned “Out of support scope”
Red Hat Enterprise Linux 7 webkitgtk3, libwebkit2gtk
affected: workaround, no fix planned “Will not fix”
Red Hat Enterprise Linux AppStream (v. 8) webkit2gtk3 2.50.4-1.el8_10, webkit2gtk3-jsc 2.50.4-1.el8_10
fixed: vendor fix RHSA-2025:23663
Red Hat Enterprise Linux AppStream (v. 9) webkit2gtk3 2.50.4-1.el9_7, webkit2gtk3-jsc 2.50.4-1.el9_7
fixed: vendor fix RHSA-2025:23700
Red Hat Enterprise Linux AppStream AUS (v. 8.2) webkit2gtk3 2.50.4-1.el8_2, webkit2gtk3-jsc 2.50.4-1.el8_2
fixed: vendor fix RHSA-2025:23969
Red Hat Enterprise Linux AppStream AUS (v.8.4) webkit2gtk3 2.50.4-1.el8_4, webkit2gtk3-jsc 2.50.4-1.el8_4
fixed: vendor fix RHSA-2025:23967
Red Hat Enterprise Linux AppStream AUS (v.8.6) webkit2gtk3 2.50.4-1.el8_6, webkit2gtk3-jsc 2.50.4-1.el8_6 Red Hat Enterprise Linux AppStream E4S (v.8.6) webkit2gtk3 2.50.4-1.el8_6, webkit2gtk3-jsc 2.50.4-1.el8_6
fixed: vendor fix RHSA-2025:23968
Red Hat Enterprise Linux AppStream E4S (v.8.8) webkit2gtk3 2.50.4-1.el8_8, webkit2gtk3-jsc 2.50.4-1.el8_8
fixed: vendor fix RHSA-2025:23973

show 8 more

Red Hat Enterprise Linux AppStream E4S (v.9.0) webkit2gtk3 2.50.4-1.el9_0, webkit2gtk3-jsc 2.50.4-1.el9_0
fixed: vendor fix RHSA-2025:23970
Red Hat Enterprise Linux AppStream E4S (v.9.2) webkit2gtk3 2.50.4-1.el9_2, webkit2gtk3-jsc 2.50.4-1.el9_2
fixed: vendor fix RHSA-2025:23971
Red Hat Enterprise Linux AppStream EUS (v.9.4) webkit2gtk3 2.50.4-1.el9_4, webkit2gtk3-jsc 2.50.4-1.el9_4
fixed: vendor fix RHSA-2025:23972
Red Hat Enterprise Linux AppStream EUS (v.9.6) webkit2gtk3 2.50.4-1.el9_6, webkit2gtk3-jsc 2.50.4-1.el9_6
fixed: vendor fix RHSA-2025:23974
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) webkit2gtk3 2.50.4-1.el8_4, webkit2gtk3-jsc 2.50.4-1.el8_4
fixed: vendor fix RHSA-2025:23967
Red Hat Enterprise Linux AppStream TUS (v.8.6) webkit2gtk3 2.50.4-1.el8_6, webkit2gtk3-jsc 2.50.4-1.el8_6
fixed: vendor fix RHSA-2025:23968
Red Hat Enterprise Linux AppStream TUS (v.8.8) webkit2gtk3 2.50.4-1.el8_8, webkit2gtk3-jsc 2.50.4-1.el8_8
fixed: vendor fix RHSA-2025:23973
Red Hat Enterprise Linux Server (v. 7 ELS) webkitgtk4 2.50.4-2.el7_9, webkitgtk4-jsc 2.50.4-2.el7_9 Red Hat Enterprise Linux Server Optional (v. 7 ELS) webkitgtk4-doc 2.50.4-2.el7_9, webkitgtk4-devel 2.50.4-2.el7_9, webkitgtk4-debuginfo 2.50.4-2.el7_9, webkitgtk4-jsc-devel 2.50.4-2.el7_9
fixed: vendor fix RHSA-2025:23975

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

Timeline

2025-12-12 0-day patched (Project Zero)
2025-12-15 Added to CISA KEV
2025-12-17 Published
2025-12-18 CISA SSVC: exploitation active
2026-01-05 CISA patch deadline

Known exploited

Added: 10 mo ago (2025-12-15)
Patch by: 2026-01-05 (10 mo ago)
Ransomware: Not known
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor, product: Apple, Multiple Products
CISA name: Apple Multiple Products Use-After-Free WebKit Vulnerability

Zero-day

Detected in real attacks while still unknown to the vendor and the public, per Google Project Zero's 0day In-the-Wild tracker.

Patched: 2025-12-12
Details: project zero tracker

CISA SSVC

Exploitation: Active, exploited in the wild
Automatable: no
Technical impact: total
Assessed: 10 mo ago (2025-12-18)

Exploit prediction

25.65% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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-416 Use After Free

References

support.apple.com /en-us/125884
release-notes, vendor-advisory
support.apple.com /en-us/125885
release-notes, vendor-advisory
support.apple.com /en-us/125886
release-notes, vendor-advisory
support.apple.com /en-us/125889
release-notes, vendor-advisory
support.apple.com /en-us/125890
release-notes, vendor-advisory
support.apple.com /en-us/125891
release-notes, vendor-advisory
support.apple.com /en-us/125892
release-notes, vendor-advisory
cisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-43529
government-resource, us-government-resource

Sources

CVE List CVE-2025-43529
NVD CVE-2025-43529

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