Microsoft Edge WebView2 Runtime 139.0.3405.86
Microsoft Edge WebView2 Runtime 139.0.3405.86, released August 7, 2025, fixes 9 CVEs in Microsoft Edge WebView2 Runtime. None of them is reported as exploited. Patch Radar priority: High. The latest Microsoft Edge WebView2 Runtime is 157.0.4341.42, which also fixes every one of these CVEs.
Superseded. The latest Microsoft Edge WebView2 Runtime is 157.0.4341.42, which also fixes every CVE on this page. Install that instead.
Priority of the 9 CVEs
Applies to
| Product | Version |
|---|---|
| Microsoft Edge WebView2 Runtime | 139.0.3405.86 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| High | CVE-2025-9132 | Chromium: CVE-2025-9132 Out of bounds write in V8 | 8.8 | 0.0317 | None reported |
| High | CVE-2025-8578 | Chromium: CVE-2025-8578 Use after free in Cast | 8.8 | 0.0036 | None reported |
| High | CVE-2025-8576 | Chromium: CVE-2025-8576 Use after free in Extensions | 8.8 | 0.0034 | None reported |
| Routine | CVE-2025-8581 | Chromium: CVE-2025-8581 Inappropriate implementation in Extensions | 4.3 | 0.0030 | None reported |
| Routine | CVE-2025-8577 | Chromium: CVE-2025-8577 Inappropriate implementation in Picture In Picture | 4.3 | 0.0026 | None reported |
| Routine | CVE-2025-8579 | Chromium: CVE-2025-8579 Inappropriate implementation in Gemini Live in Chrome | 4.3 | 0.0026 | None reported |
| Routine | CVE-2025-8580 | Chromium: CVE-2025-8580 Inappropriate implementation in Filesystems | 4.3 | 0.0026 | None reported |
| Routine | CVE-2025-8582 | Chromium: CVE-2025-8582 Insufficient validation of untrusted input in DOM | 4.3 | 0.0026 | None reported |
| Routine | CVE-2025-8583 | Chromium: CVE-2025-8583 Inappropriate implementation in Permissions | 4.3 | 0.0024 | None reported |
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