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Vulnerability · Published Aug 24, 2026 · Assigned by redhat

CVE-2026-78376Webkitgtk: use-after-free of jscvalue function parameters

High 8.8

In plain English

A high-severity use-after-free 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 41% 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 59.3% 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 a use-after-free issue due to improper memory handling and result in memory corruption.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12webkit2gtkno fix listedDEBIAN-CVE-2026-78376
Debian:13webkit2gtk2.54.0-1~deb13u1DEBIAN-CVE-2026-78376
Debian:14webkit2gtkno fix listedDEBIAN-CVE-2026-78376
Debian:12wpewebkitno fix listedDEBIAN-CVE-2026-78376
Debian:13wpewebkitno fix listedDEBIAN-CVE-2026-78376
Debian:14wpewebkit2.54.0-1DEBIAN-CVE-2026-78376
Ubuntu:22.04:LTSqtwebkit-opensource-srcno fix listedUBUNTU-CVE-2026-78376
Ubuntu:24.04:LTSqtwebkit-opensource-srcno fix listedUBUNTU-CVE-2026-78376
Ubuntu:22.04:LTSwebkit2gtkno fix listedUBUNTU-CVE-2026-78376
Ubuntu:24.04:LTSwebkit2gtkno fix listedUBUNTU-CVE-2026-78376
Ubuntu:26.04:LTSwebkit2gtkno fix listedUBUNTU-CVE-2026-78376
Ubuntu:26.10webkit2gtkno fix listedUBUNTU-CVE-2026-78376
Ubuntu:22.04:LTSwpewebkitno fix listedUBUNTU-CVE-2026-78376

Affected products (as reported)

VendorProductVersions
WebKit WebKit 2.21.1 – before *
WebKitGTK WebKitGTK 2.21.1 – 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-416 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References