CVE-2026-83596
Webkitgtk: validate the full featurelist array once in opentypeverticaldata findfeature
A flaw was found in WebKitGTK. Processing malicious web content can cause memory corruption due to improper memory handling.
Fixes and workarounds
Workaround
Do not process or load untrusted web content with WebKitGTK. In Red Hat Enterprise Linux 7, the following packages require WebKitGTK4: evolution-data-server, glade, gnome-boxes, gnome-initial-setup, gnome-online-accounts, gnome-shell, shotwell, sushi and yelp. This vulnerability can only be exploited when these packages are installed in the system and being used via a graphical interface to process untrusted web content, via GNOME for example. In gnome-shell, the vulnerability can be exploited by an attacker from the local network without user interaction. To mitigate this vulnerability, consider removing these packages. Note that some of these packages are required by GNOME, removing them will also remove GNOME and other packages, breaking functionality. However, the server can still be used via the terminal interface. Additionally, WebKitGTK3 is not required by any package. Therefore, it can be removed without consequences or break of functionality.
Source: CNA: redhatAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| WebKit WebKit webkit
https://webkit.org/ |
≥ 1.10.0; < * (affected, semver)
Other versions: unaffected |
CNA: redhat |
| WebKitGTK WebKitGTK webkitgtk
https://webkitgtk.org/ |
≥ 1.10.0; < * (affected, semver)
Other versions: unaffected |
CNA: redhat |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support Red Hat webkitgtk4
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.54.0-1.el7_9; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8 Red Hat webkit2gtk3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.54.0-1.el8_10; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat webkit2gtk3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.54.0-1.el8_6; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Red Hat webkit2gtk3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.54.0-1.el8_6; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.8 Telecommunications Update Service Red Hat webkit2gtk3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.54.0-1.el8_8; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat webkit2gtk3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.54.0-1.el8_8; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9 Red Hat webkit2gtk3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.54.0-1.el9_8; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Red Hat webkit2gtk3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.54.0-1.el9_2; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Red Hat webkit2gtk3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.54.0-1.el9_4; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 9.6 Extended Update Support Red Hat webkit2gtk3
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:2.54.0-1.el9_6; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 6 Red Hat webkitgtk
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unknown |
CNA: redhat |
| Red Hat Enterprise Linux 7 Red Hat webkitgtk3
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unaffected |
CNA: redhat |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 8.8 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | CNA: redhat |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://access.redhat.com/errata/RHSA-2026:69098CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:74084CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:89821CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:89822CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:91631CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:92216CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:92339CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:93435CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-83596CNA: redhat · vdb-entry, x_refsource_REDHAT
- https://bugs.webkit.org/show_bug.cgi?id=322969CNA: redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2526490CNA: redhat · issue-tracking, x_refsource_REDHAT