MicrosoftEdge / MicrosoftEdge/WebView2Feedback
[Problem/Bug]: Runtime regression in mixed CEF/WebView2 hosting with 146 & CEF 140
@krbharadwaj is already working on this.
Since Apr 23, 2026.
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Description
What happened?
We have a windows desktop application (.net 4.8) that hosts web pages in both CEF and WebView2. The rollout of WebView2 runtime 146.0.3856.62 has started a crash in the application related to popup windows. This looks similar to https://github.com/MicrosoftEdge/WebView2Feedback/issues/4343 We are running the CEF version 140.9.7339.185 and CEF crashes with
[2660:22900:0315/211214.734:FATAL:ui\gfx\win\hwnd_util.cc:65] 1400
If we force the application back to the 145 runtime the problem is resolved.
Importance
Important. My app's user experience is significantly compromised.
Runtime Channel
Stable release (WebView2 Runtime)
Runtime Version
146.0.3856.62
SDK Version
No response
Framework
WPF
Operating System
Windows 11
OS Version
26200.8037
Repro steps
We run our application and pages in both Edge and CEF can be views. If the CEF web page does a window.open call the crash occurs. We are trying to write a small sample to demonstrate the problem.
Repros in Edge Browser
No, issue does not reproduce in the corresponding Edge version
Regression
No, this never worked
Last working version (if regression)
145.0.3800.97
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