Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-78376
Webkitgtk: use-after-free of jscvalue function parameters
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N R U H H H 8.8 .0029 19.1 —
AFFECTED
Product Versions Fixed
WebKit 2.21.1 – —
WebKitGTK 2.21.1 – —
Red Hat Enterprise Linux 8 unspecified 0:2.54.0-1.el8_10
Red Hat Enterprise Linux 9 unspecified 0:2.54.0-1.el9_8
Red Hat Enterprise Linux 6 unspecified —
Red Hat Enterprise Linux 7 unspecified —
Red Hat Enterprise Linux 7 unspecified —
TIMELINE
Aug 24 Reserved by redhat
Aug 24 Published (CNA: redhat)
Sep 21 PATCH SHIPPED — CVE-2026-78376 (WebKit). Fixed in Red Hat Enterprise Linux 9 0:2.54.0-1.el9_8.
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| August 24, 2026 | Reserved | Reserved by redhat |
| August 24, 2026 | Published | Published (CNA: redhat) |
| September 21, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-78376 (WebKit). Fixed in Red Hat Enterprise Linux 9 0:2.54.0-1.el9_8. |
Affected
Affected products and packages — 7 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| WebKit | WebKit | — | 2.21.1 | — |
| WebKitGTK | WebKitGTK | — | 2.21.1 | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | 0:2.54.0-1.el8_10 |
| Red Hat | Red Hat Enterprise Linux 9 | — | — | 0:2.54.0-1.el9_8 |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-78376 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
