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Fencer Vulns
high 8.8

CVE-2023-39434 json

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

published 2023-09-26 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-43158

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

A use-after-free issue was addressed with improved memory management. This issue is fixed in iOS 17 and iPadOS 17, watchOS 10, macOS Sonoma 14. Processing web content may lead to arbitrary code execution.

Patch / fix

  • Apple iOS and iPadOS 17
  • Apple macOS 14
  • Apple watchOS 10
  • wpewebkit Debian 14, Debian 13 2.40.5-1
  • webkit2gtk Debian 12 2.40.5-1~deb12u1
  • webkit2gtk Debian 14, Debian 13 2.40.5-1

debian advisories DEBIAN-CVE-2023-39434

  • webkit2gtk Ubuntu 22.04 LTS 2.40.5-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2023-39434

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 SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +8 more 2.42.1-150200.87.4
  • webkit2gtk3 SLE Module for Desktop Applications 15 SP5, SLE Module for Desktop Applications 15 SP4, openSUSE Leap 15.5 +1 more 2.42.1-150400.4.57.2
  • webkit2gtk4 SLE Module for Development Tools 15 SP5, SLE Module for Development Tools 15 SP4, openSUSE Leap 15.5 +1 more 2.42.1-150400.4.57.3
  • webkit2gtk3-soup2 SLE Module for Basesystem 15 SP5, SLE Module for Basesystem 15 SP4, openSUSE Leap 15.5 +1 more 2.42.1-150400.4.57.2
  • webkit2gtk3 SLES for SAP 12 SP5, SLES 12 SP5, SLE Workstation Extension 12 SP5 +1 more 2.42.1-2.155.1
  • webkit2gtk3 SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 2.42.1-150000.3.153.1

suse advisories SUSE-SU-2023:4339-1SUSE-SU-2023:4294-1SUSE-SU-2023:4211-1SUSE-SU-2023:4209-1

  • webkit2gtk3 AlmaLinux 8 2.40.5-1.el8
  • webkit2gtk3-jsc AlmaLinux 8 2.40.5-1.el8
  • webkit2gtk3 AlmaLinux 9 2.40.5-1.el9
  • webkit2gtk3-jsc AlmaLinux 9 2.40.5-1.el9

almalinux advisories ALSA-2023:7055ALSA-2023:6535

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-2023-39434 updated cvss 8.8

webkitgtk: processing web content may lead to arbitrary code execution

  • Red Hat Enterprise Linux 6 webkitgtk Red Hat Enterprise Linux 7 webkitgtk3, webkitgtk4, libwebkit2gtk, webkitgtk4-jsc, webkitgtk4-plugin-process-gtk2
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 webkit2gtk3, webkit2gtk3-jsc, webkit2gtk3-plugin-process-gtk2 Red Hat Enterprise Linux 9 webkit2gtk3, webkit2gtk3-jsc
    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
no
Technical impact
total
Assessed
18 mo ago

Exploit prediction

1.65% chance of exploitation in the next 30 days, higher than 76% 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
NVD 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 iOS and iPadOS
  • Apple macOS
  • Apple watchOS

Classification

Weakness

References

Sources

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.