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Vulnerability · Published Aug 31, 2026 · Assigned by redhat

CVE-2026-83596Webkitgtk: validate the full featurelist array once in opentypeverticaldata findfeature

High 8.8

In plain English

A high-severity buffer overflow in Red Hat Enterprise Linux 6 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.5%top 56.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12webkit2gtkno fix listedDEBIAN-CVE-2026-83596
Debian:13webkit2gtk2.54.0-1~deb13u1DEBIAN-CVE-2026-83596
Debian:14webkit2gtkno fix listedDEBIAN-CVE-2026-83596
Debian:12wpewebkitno fix listedDEBIAN-CVE-2026-83596
Debian:13wpewebkitno fix listedDEBIAN-CVE-2026-83596
Debian:14wpewebkit2.54.0-1DEBIAN-CVE-2026-83596

Affected products (as reported)

VendorProductVersions
WebKit WebKit 1.10.0 – before *
WebKitGTK WebKitGTK 1.10.0 – before *
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support see references
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On see references
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service see references
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions see references
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references

Weakness: CWE-120 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References