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Fencer Vulns
high 8.8

CVE-2023-39928 json

A use-after-free vulnerability exists in the MediaRecorder API of Webkit WebKitGTK 2.40.5.

published 2023-10-06 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-43626

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 73%
public exploits
0
none known

Summary

A use-after-free vulnerability exists in the MediaRecorder API of Webkit WebKitGTK 2.40.5. A specially crafted web page can abuse this vulnerability to cause memory corruption and potentially arbitrary code execution. A user would need to to visit a malicious webpage to trigger this vulnerability.

Patch / fix

  • wpewebkit Debian 14, Debian 13 2.42.0-1
  • webkit2gtk Debian 12 2.42.1-1~deb12u1
  • webkit2gtk Debian 14, Debian 13 2.42.0-1

debian advisories DEBIAN-CVE-2023-39928

  • webkit2gtk Ubuntu 22.04 LTS 2.42.1-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2023-39928

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 8 2.42.5-1.el8
  • webkit2gtk3-jsc RHEL 8 2.42.5-1.el8
  • webkit2gtk3 RHEL 9 2.42.5-1.el9
  • webkit2gtk3-jsc RHEL 9 2.42.5-1.el9
  • webkitgtk4 RHEL 7 ELS 2.48.3-2.el7_9
  • webkitgtk4-jsc RHEL 7 ELS 2.48.3-2.el7_9

red hat advisories RHSA-2025:10364RHSA-2024:2982RHSA-2024:2126

  • webkit2gtk3 SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Real Time 15 SP4 +6 more 2.42.4-150400.4.70.3
  • webkit2gtk4 SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Real Time 15 SP4 +5 more 2.42.4-150400.4.70.3
  • webkit2gtk3-soup2 SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Real Time 15 SP4 +8 more 2.42.4-150400.4.70.3
  • webkit2gtk3 SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +5 more 2.42.4-150200.97.3
  • webkit2gtk3 SLES for SAP 12 SP5, SLES 12 SP5, SLE Workstation Extension 12 SP5 +1 more 2.42.4-2.164.1
  • 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

suse advisories SUSE-SU-2024:0004-1SUSE-SU-2024:0003-1SUSE-SU-2024:0002-1SUSE-SU-2023:4978-1SUSE-SU-2023:4339-1SUSE-SU-2023:4294-1

  • webkit2gtk3 AlmaLinux 8 2.42.5-1.el8
  • webkit2gtk3-jsc AlmaLinux 8 2.42.5-1.el8
  • webkit2gtk3 AlmaLinux 9 2.42.5-1.el9
  • webkit2gtk3-jsc AlmaLinux 9 2.42.5-1.el9

almalinux advisories ALSA-2024:2982ALSA-2024:2126

  • webkit2gtk3 Rocky Linux 8 2.42.5-1.el8

rocky linux advisories RLSA-2024:2982

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-2023-39928 updated cvss 8.8

webkitgtk: use-after-free in the MediaRecorder API of the WebKit GStreamer-based ports

  • Red Hat Enterprise Linux 6 webkitgtk Red Hat Enterprise Linux 7 webkitgtk3, libwebkit2gtk
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) webkit2gtk3 2.42.5-1.el8, webkit2gtk3-jsc 2.42.5-1.el8
    fixed: vendor fix RHSA-2024:2982
  • Red Hat Enterprise Linux AppStream (v. 9) webkit2gtk3 2.42.5-1.el9, webkit2gtk3-jsc 2.42.5-1.el9
    fixed: vendor fix RHSA-2024:2126
  • Red Hat Enterprise Linux Server (v. 7 ELS) webkitgtk4 2.48.3-2.el7_9, webkitgtk4-jsc 2.48.3-2.el7_9 Red Hat Enterprise Linux Server Optional (v. 7 ELS) webkitgtk4-doc 2.48.3-2.el7_9, webkitgtk4-devel 2.48.3-2.el7_9, webkitgtk4-debuginfo 2.48.3-2.el7_9, webkitgtk4-jsc-devel 2.48.3-2.el7_9
    fixed: vendor fix RHSA-2025:10364

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

Exploit prediction

1.45% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 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

Affected products

  • Webkit Webkit

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.