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HighVulnerabilityupdated 29 Oct 2026, 13:35 UTC

WebKitGTK browser engine has several flaws that can crash or leak data

WebKitGTK is the web engine used by some Linux apps to show web pages. Attackers can exploit several bugs in it to crash the app, read information they should not see, or bypass security protections.

Official source
SeverityHighVulnerability
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official sourceBacked by an official source

What happened

Multiple vulnerabilities in WebKitGTK allow a remote, unauthenticated attacker to cause a denial of service, disclose information, manipulate data, and bypass security measures.

Why it is dangerous: Anyone whose app or desktop uses a vulnerable WebKitGTK may have sessions crashed, data exposed, or security protections circumvented, especially when opening untrusted web content.

Are you affected?

You are affected if you run a WebKitGTK-based application or system with an unpatched WebKitGTK version.

WebKitGTK (versions not specified in the source material)

What to do

  1. Check which WebKitGTK version your system or applications use
  2. Install the latest WebKitGTK security update from your Linux distribution
  3. Restart applications that use WebKitGTK after updating

Timeline

  1. 29 Oct 2026, 12:55 UTC
    Publicly disclosed
  2. 29 Oct 2026, 12:55 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  3. 29 Oct 2026, 12:56 UTC
    Reported by CERT-Bund (BSI) · CERT-Bund (BSI)
  4. 29 Oct 2026, 12:58 UTC
    Picked up by Zero Radar
  5. 29 Oct 2026, 13:35 UTC
    Severity raised to high

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
ZR-3a5947b4 · ZR-9534e055
Disclosed
29 Oct 2026, 12:55 UTC
On Zero Radar
29 Oct 2026, 12:58 UTC (3 min after disclosure)
Last change
29 Oct 2026, 13:35 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

WebKitGTK browser engine has several flaws that can crash or leak data · Zero Radar