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Fencer Vulns
high 8.8

CVE-2022-42856 kev in the critical feed json

A type confusion issue was addressed with improved state handling.

published 2022-12-15 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-45919

cvss
8.8
version 3.1, CNA
cisa kev
Exploited
added 2022-12-14
epss
8.5%
EPSS 8.5% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

A type confusion issue was addressed with improved state handling. This issue is fixed in Safari 16.2, tvOS 16.2, macOS Ventura 13.1, iOS 15.7.2 and iPadOS 15.7.2, iOS 16.1.2. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited against versions of iOS released before iOS 15.1..

Patch / fix

cisa required action Apply updates per vendor instructions.

  • Apple tvOS 13.1, 15.7, 16.1, 16.2
  • wpewebkit Debian 14, Debian 13, Debian 12 2.38.3-1
  • webkit2gtk Debian 14, Debian 13, Debian 12 2.38.3-1

debian advisories DEBIAN-CVE-2022-42856

  • webkit2gtk Ubuntu 20.04 LTS 2.38.3-0ubuntu0.20.04.1
  • webkit2gtk Ubuntu 22.04 LTS 2.38.3-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2022-42856

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 2.36.7-1.el9_1.1
  • webkit2gtk3-jsc RHEL 9 2.36.7-1.el9_1.1
  • webkit2gtk3 RHEL 8 2.36.7-1.el8_7.1
  • webkit2gtk3-jsc RHEL 8 2.36.7-1.el8_7.1
  • 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-2023:0021RHSA-2023:0016

  • webkit2gtk3 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +5 more 2.38.3-2.123.1
  • webkit2gtk3 SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS +1 more 2.38.3-150000.3.125.1
  • webkit2gtk3 SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +14 more 2.38.3-150200.57.1
  • webkit2gtk3 SLE Module for Desktop Applications 15 SP4, openSUSE Leap 15.4 2.38.3-150400.4.25.1
  • webkit2gtk4 SLE Module for Development Tools 15 SP4, openSUSE Leap 15.4 2.38.3-150400.4.25.1
  • webkit2gtk3-soup2 SLE Module for Basesystem 15 SP4, openSUSE Leap 15.4 2.38.3-150400.4.25.1

suse advisories SUSE-SU-2023:0061-1SUSE-SU-2022:4642-1SUSE-SU-2022:4641-1SUSE-SU-2022:4634-1

  • webkit2gtk3 AlmaLinux 8 2.36.7-1.el8_7.1
  • webkit2gtk3-jsc AlmaLinux 8 2.36.7-1.el8_7.1
  • webkit2gtk3 AlmaLinux 9 2.36.7-1.el9_1.1
  • webkit2gtk3-jsc AlmaLinux 9 2.36.7-1.el9_1.1

almalinux advisories ALSA-2023:0016ALSA-2023:0021

  • webkit2gtk3 Rocky Linux 9 2.36.7-1.el9_1.1
  • webkit2gtk3 Rocky Linux 8 2.36.7-1.el8_7.1

rocky linux advisories RLSA-2023:0021RLSA-2023:0016

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-2022-42856 updated cvss 8.8

webkitgtk: processing maliciously crafted web content may lead to an arbitrary code execution

  • Red Hat Enterprise Linux 6 webkitgtk Red Hat Enterprise Linux 7 webkitgtk3, libwebkit2gtk
    affected: workaround, no fix planned “Setting the environment variable JSC_useFTLJIT=0 will disable the vulnerable code. (This will also somewhat slow down JavaScript execution.)”
  • Red Hat Enterprise Linux AppStream (v. 8) webkit2gtk3 2.36.7-1.el8_7.1, webkit2gtk3-jsc 2.36.7-1.el8_7.1
    fixed: vendor fix “Setting the environment variable JSC_useFTLJIT=0 will disable the vulnerable code. (This will also somewhat slow down JavaScript execution.)” RHSA-2023:0016
  • Red Hat Enterprise Linux AppStream (v. 9) webkit2gtk3 2.36.7-1.el9_1.1, webkit2gtk3-jsc 2.36.7-1.el9_1.1
    fixed: vendor fix “Setting the environment variable JSC_useFTLJIT=0 will disable the vulnerable code. (This will also somewhat slow down JavaScript execution.)” RHSA-2023:0021
  • 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 “Setting the environment variable JSC_useFTLJIT=0 will disable the vulnerable code. (This will also somewhat slow down JavaScript execution.)” 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

Timeline

  1. 0-day patched (Project Zero)
  2. Added to CISA KEV
  3. Published
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
3 y ago
Patch by
2023-01-04 (3 y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Apple, iOS
CISA name
Apple iOS Type Confusion 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
2022-11-30
Details
project zero tracker

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
21 mo ago

Exploit prediction

8.52% chance of exploitation in the next 30 days, higher than 95% 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 tvOS

Classification

Weakness
  • CWE-843 Access of Resource Using Incompatible Type

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.