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Fencer Vulns
high 8.8

CVE-2026-83596 json

Webkitgtk: validate the full featurelist array once in opentypeverticaldata findfeature

published 2026-08-31 2 mo ago modified 2026-11-05 4 d ago also EUVD-2026-68809

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

A flaw was found in WebKitGTK. Processing malicious web content can cause memory corruption due to improper memory handling.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.54.0-1.el7_9
  • Red Hat Red Hat Enterprise Linux 8 0:2.54.0-1.el8_10
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.54.0-1.el8_4
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:2.54.0-1.el8_4
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.54.0-1.el8_6
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:2.54.0-1.el8_6
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:2.54.0-1.el8_8
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:2.54.0-1.el8_8
  • Red Hat Red Hat Enterprise Linux 9 0:2.54.0-1.el9_8
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.54.0-1.el9_2
  • Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:2.54.0-1.el9_4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:2.54.0-1.el9_6
  • wpewebkit Debian 14 2.54.0-1
  • webkit2gtk Debian 13 2.54.0-1~deb13u1

debian advisories DEBIAN-CVE-2026-83596

  • webkit2gtk3 RHEL 8 2.54.0-1.el8_10
  • webkit2gtk3-jsc RHEL 8 2.54.0-1.el8_10
  • webkit2gtk3 RHEL 9 2.54.0-1.el9_8
  • webkit2gtk3-jsc RHEL 9 2.54.0-1.el9_8

red hat advisories RHSA-2026:74084RHSA-2026:69098

  • webkit2gtk3 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.54.1-150400.4.157.4
  • webkit2gtk4 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.54.1-150400.4.157.4
  • webkit2gtk3-soup2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.54.1-150400.4.157.5
  • webkit2gtk3 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Desktop Applications 15 SP7 2.54.1-150600.12.81.3
  • webkit2gtk4 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 +1 more 2.54.1-150600.12.81.4
  • webkit2gtk3-soup2 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 2.54.1-150600.12.81.4

suse advisories SUSE-SU-2026:4868-1SUSE-SU-2026:4858-1

  • webkit2gtk3 AlmaLinux 8 2.54.0-1.el8_10
  • webkit2gtk3-jsc AlmaLinux 8 2.54.0-1.el8_10
  • webkit2gtk3 AlmaLinux 9 2.54.0-1.el9_8
  • webkit2gtk3-jsc AlmaLinux 9 2.54.0-1.el9_8

almalinux advisories ALSA-2026:74084ALSA-2026:69098

  • webkit2gtk3 Rocky Linux 8 2.54.0-1.el8_10
  • webkit2gtk3 Rocky Linux 9 2.54.0-1.el9_8

rocky linux advisories RLSA-2026:74084RLSA-2026:69098

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-2026-83596 updated cvss 8.8

webkitgtk: Validate the full FeatureList array once in OpenTypeVerticalData findFeature

  • Red Hat Enterprise Linux 6 webkitgtk
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) webkit2gtk3 2.54.0-1.el8_10, webkit2gtk3-jsc 2.54.0-1.el8_10
    fixed: vendor fix RHSA-2026:74084
  • Red Hat Enterprise Linux AppStream (v. 9) webkit2gtk3 2.54.0-1.el9_8, webkit2gtk3-jsc 2.54.0-1.el9_8
    fixed: vendor fix RHSA-2026:69098
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) webkit2gtk3 2.54.0-1.el8_4, webkit2gtk3-jsc 2.54.0-1.el8_4
    fixed: vendor fix RHSA-2026:95403
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) webkit2gtk3 2.54.0-1.el8_6, webkit2gtk3-jsc 2.54.0-1.el8_6
    fixed: vendor fix RHSA-2026:92339
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) webkit2gtk3 2.54.0-1.el8_8, webkit2gtk3-jsc 2.54.0-1.el8_8
    fixed: vendor fix RHSA-2026:93435
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) webkit2gtk3 2.54.0-1.el9_2, webkit2gtk3-jsc 2.54.0-1.el9_2
    fixed: vendor fix RHSA-2026:89822
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) webkit2gtk3 2.54.0-1.el9_4, webkit2gtk3-jsc 2.54.0-1.el9_4
    fixed: vendor fix RHSA-2026:92216
show 6 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) webkit2gtk3 2.54.0-1.el9_6, webkit2gtk3-jsc 2.54.0-1.el9_6
    fixed: vendor fix RHSA-2026:89821
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) webkit2gtk3 2.54.0-1.el8_4, webkit2gtk3-jsc 2.54.0-1.el8_4
    fixed: vendor fix RHSA-2026:95403
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) webkit2gtk3 2.54.0-1.el8_6, webkit2gtk3-jsc 2.54.0-1.el8_6
    fixed: vendor fix RHSA-2026:92339
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) webkit2gtk3 2.54.0-1.el8_8, webkit2gtk3-jsc 2.54.0-1.el8_8
    fixed: vendor fix RHSA-2026:93435
  • Red Hat Enterprise Linux Server (v. 7 ELS) webkitgtk4 2.54.0-1.el7_9, webkitgtk4-jsc 2.54.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7 ELS) webkitgtk4-doc 2.54.0-1.el7_9, webkitgtk4-devel 2.54.0-1.el7_9, webkitgtk4-debuginfo 2.54.0-1.el7_9, webkitgtk4-jsc-devel 2.54.0-1.el7_9
    fixed: vendor fix RHSA-2026:91631
  • 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
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 43% 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

Affected products

  • WebKit WebKit
  • WebKitGTK WebKitGTK
  • 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-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.