Windows apps · Application version · August 28, 2025

Microsoft Edge WebView2 Runtime 139.0.3405.125

Microsoft Edge WebView2 Runtime 139.0.3405.125, released August 28, 2025, fixes 1 CVE in Microsoft Edge WebView2 Runtime. None of them is reported as exploited. Patch Radar priority: Urgent. The latest Microsoft Edge WebView2 Runtime is 157.0.4341.42, which also fixes every one of these CVEs.

Urgent

Superseded. The latest Microsoft Edge WebView2 Runtime is 157.0.4341.42, which also fixes every CVE on this page. Install that instead.

CVEs closed
1
1 rated Critical
Exploited
0
None reported
Highest CVSS
9.6
Base score, 0 to 10
Highest EPSS
0.0742
94th percentile

Applies to

ProductVersion
Microsoft Edge WebView2 Runtime139.0.3405.125

CVEs this fix closes

PriorityCVETitleCVSSEPSSExploitation
Urgent CVE-2025-9478 Chromium: CVE-2025-9478 Use after free in ANGLE9.6 0.0742 None reported
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