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Fencer Vulns
high 8.8

CVE-2026-28953 json

The issue was addressed with improved memory handling.

published 2026-05-11 5 mo ago modified 2026-10-26 13 d ago also EUVD-2026-29258

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5, iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, watchOS 26.5. Processing maliciously crafted web content may lead to an unexpected process crash.

Patch / fix

  • Apple Safari 26.5
  • Apple iOS and iPadOS 18.7.9, 26.5
  • Apple macOS 26.5
  • Apple tvOS 26.5
  • Apple visionOS 26.5
  • Apple watchOS 26.5
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.52.4-1.el7_9
  • Red Hat Red Hat Enterprise Linux 8 0:2.52.4-1.el8_10
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.52.4-1.el8_4
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:2.52.4-1.el8_4
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.52.4-1.el8_6
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:2.52.4-1.el8_6
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:2.52.4-1.el8_8
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:2.52.4-1.el8_8
  • Red Hat Red Hat Enterprise Linux 9 0:2.52.4-1.el9_8
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.52.4-1.el9_2
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:2.52.4-1.el9_4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:2.52.4-1.el9_6
  • wpewebkit Debian 14 2.52.4-1
  • webkit2gtk Debian 13 2.52.5-1~deb13u1
  • webkit2gtk Debian 14 2.52.4-1

debian advisories DEBIAN-CVE-2026-28953

  • webkit2gtk Ubuntu 24.04 LTS 2.52.6-0ubuntu0.24.04.1
  • webkit2gtk Ubuntu 26.04 LTS 2.52.6-0ubuntu0.26.04.1

ubuntu advisories UBUNTU-CVE-2026-28953

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 2.52.4-1.el9_8
  • webkit2gtk3-jsc RHEL 9 2.52.4-1.el9_8
  • webkit2gtk3 RHEL 8 2.52.4-1.el8_10
  • webkit2gtk3-jsc RHEL 8 2.52.4-1.el8_10
  • webkit2gtk3 RHEL 9.6 EUS 2.52.4-1.el9_6
  • webkit2gtk3-jsc RHEL 9.6 EUS 2.52.4-1.el9_6
  • webkit2gtk3 RHEL 9.2 E4S 2.52.4-1.el9_2
  • webkit2gtk3-jsc RHEL 9.2 E4S 2.52.4-1.el9_2

red hat advisories RHSA-2026:28147RHSA-2026:28148RHSA-2026:28146RHSA-2026:28114RHSA-2026:27804RHSA-2026:27785

  • webkit2gtk3 SLES 16.0, SLES for SAP applications 16.0 2.52.4-160000.1.1
  • webkit2gtk4 SLES 16.0, SLES for SAP applications 16.0 2.52.4-160000.1.1
  • webkit2gtk3 SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLES 15 SP4-LTSS +2 more 2.52.4-150400.4.143.1
  • webkit2gtk4 SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLES 15 SP4-LTSS +2 more 2.52.4-150400.4.143.1
  • webkit2gtk3-soup2 SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLES 15 SP4-LTSS +2 more 2.52.4-150400.4.143.1
  • webkit2gtk3 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Desktop Applications 15 SP7 2.52.4-150600.12.68.1
  • webkit2gtk4 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 +1 more 2.52.4-150600.12.68.1
  • webkit2gtk3-soup2 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 2.52.4-150600.12.68.1

suse advisories SUSE-SU-2026:2623-1SUSE-SU-2026:22203-1SUSE-SU-2026:22212-1SUSE-SU-2026:2378-1SUSE-SU-2026:2376-1

  • webkit2gtk3 openSUSE Leap 16.0 2.52.4-160000.1.1
  • webkit2gtk4 openSUSE Leap 16.0 2.52.4-160000.1.1
  • webkit2gtk3-soup2 openSUSE Leap 16.0 2.52.4-160000.1.1

opensuse advisories openSUSE-SU-2026:21129-1

  • webkit2gtk3 AlmaLinux 8 2.52.4-1.el8_10
  • webkit2gtk3-jsc AlmaLinux 8 2.52.4-1.el8_10
  • webkit2gtk3 AlmaLinux 9 2.52.4-1.el9_8
  • webkit2gtk3-jsc AlmaLinux 9 2.52.4-1.el9_8

almalinux advisories ALSA-2026:25918ALSA-2026:25927

  • webkit2gtk3 Rocky Linux 9 2.52.4-1.el9_8
  • webkit2gtk3 Rocky Linux 8 2.52.4-1.el8_10

rocky linux advisories RLSA-2026:25927RLSA-2026:25918

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-2026-28953 updated 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 2.52.4-1.el8_10, webkit2gtk3-jsc 2.52.4-1.el8_10
    fixed: vendor fix RHSA-2026:25918
  • Red Hat Enterprise Linux AppStream (v. 9) webkit2gtk3 2.52.4-1.el9_8, webkit2gtk3-jsc 2.52.4-1.el9_8
    fixed: vendor fix RHSA-2026:25927
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) webkit2gtk3 2.52.4-1.el8_4, webkit2gtk3-jsc 2.52.4-1.el8_4
    fixed: vendor fix RHSA-2026:27785
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) webkit2gtk3 2.52.4-1.el8_6, webkit2gtk3-jsc 2.52.4-1.el8_6
    fixed: vendor fix RHSA-2026:28114
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) webkit2gtk3 2.52.4-1.el8_8, webkit2gtk3-jsc 2.52.4-1.el8_8
    fixed: vendor fix RHSA-2026:27804
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) webkit2gtk3 2.52.4-1.el9_2, webkit2gtk3-jsc 2.52.4-1.el9_2
    fixed: vendor fix RHSA-2026:28148
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) webkit2gtk3 2.52.4-1.el9_4, webkit2gtk3-jsc 2.52.4-1.el9_4
    fixed: vendor fix RHSA-2026:28146
show 6 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) webkit2gtk3 2.52.4-1.el9_6, webkit2gtk3-jsc 2.52.4-1.el9_6
    fixed: vendor fix RHSA-2026:28147
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) webkit2gtk3 2.52.4-1.el8_4, webkit2gtk3-jsc 2.52.4-1.el8_4
    fixed: vendor fix RHSA-2026:27785
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) webkit2gtk3 2.52.4-1.el8_6, webkit2gtk3-jsc 2.52.4-1.el8_6
    fixed: vendor fix RHSA-2026:28114
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) webkit2gtk3 2.52.4-1.el8_8, webkit2gtk3-jsc 2.52.4-1.el8_8
    fixed: vendor fix RHSA-2026:27804
  • Red Hat Enterprise Linux Server (v. 7 ELS) webkitgtk4 2.52.4-1.el7_9, webkitgtk4-jsc 2.52.4-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7 ELS) webkitgtk4-doc 2.52.4-1.el7_9, webkitgtk4-devel 2.52.4-1.el7_9, webkitgtk4-debuginfo 2.52.4-1.el7_9, webkitgtk4-jsc-devel 2.52.4-1.el7_9
    fixed: vendor fix RHSA-2026:27728
  • 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
partial
Assessed
5 mo ago

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-120 Buffer Copy without Checking Size of Input

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.