high · 8.8

A flaw was found in WebKitGTK.

CVE-2026-78376 · GHSA-qcc7-6r53-qpph · EUVD-2026-64858 · published 24 Aug 2026

How serious is it

  • Severity: high, CVSS score 8.8 out of 10.
  • No exploit prediction (EPSS) score yet.
  • Not on the CISA list of exploited vulnerabilities.
  • No public exploit in Exploit-DB.

Is your app affected by CVE-2026-78376?

Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.

Who is affected

  • Webkit Webkit: 2.21.1 <*
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support: patch: 0:2.54.0-1.el7_9
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support: patch: 0:2.54.0-1.el9_6
  • The WebKitGTK Team webkitgtk: 2.21.1 <*
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: patch: 0:2.54.0-1.el9_2
  • Red Hat Red Hat Enterprise Linux 8: patch: 0:2.54.0-1.el8_10
  • Red Hat Red Hat Enterprise Linux 9: patch: 0:2.54.0-1.el9_8

How to check

  1. Find out whether you run the affected product and which version, then compare it with the versions above.

How to fix

Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
  1. Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
  2. If a vulnerable version was live, check your logs and rotate the secrets that server could read.

The advisory

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.

Check your whole app

Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.

References

Merged from ENISA EUVD. Last updated 29 Oct 2026. All vulnerabilities · RSS · JSON

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