# 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.

- Web page: https://patchblox.com/security/fix/windows-app/microsoft.edgewebview2runtime-139.0.3405.86
- Platform: Windows apps
- Released: Aug 7, 2025
- Priority: High (Closes CVE-2025-9132, high severity)
- CVEs: 9, exploited: 0, on CISA KEV: 0
- Superseded by: [Microsoft Edge WebView2 Runtime 157.0.4341.42](https://patchblox.com/security/data/product/windows-app/microsoft-edge-webview2-runtime.md), the latest version, which also fixes every CVE listed here

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Edge WebView2 Runtime](https://patchblox.com/security/data/product/windows-app/microsoft-edge-webview2-runtime.md) |  | 139.0.3405.86 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-9132](https://patchblox.com/security/data/cve/CVE-2025-9132.md) | High | Chromium: CVE-2025-9132 Out of bounds write in V8 | 8.8 | 0.0317 |  |
| [CVE-2025-8578](https://patchblox.com/security/data/cve/CVE-2025-8578.md) | High | Chromium: CVE-2025-8578 Use after free in Cast | 8.8 | 0.0036 |  |
| [CVE-2025-8576](https://patchblox.com/security/data/cve/CVE-2025-8576.md) | High | Chromium: CVE-2025-8576 Use after free in Extensions | 8.8 | 0.0034 |  |
| [CVE-2025-8581](https://patchblox.com/security/data/cve/CVE-2025-8581.md) | Routine | Chromium: CVE-2025-8581 Inappropriate implementation in Extensions | 4.3 | 0.0030 |  |
| [CVE-2025-8577](https://patchblox.com/security/data/cve/CVE-2025-8577.md) | Routine | Chromium: CVE-2025-8577 Inappropriate implementation in Picture In Picture | 4.3 | 0.0026 |  |
| [CVE-2025-8579](https://patchblox.com/security/data/cve/CVE-2025-8579.md) | Routine | Chromium: CVE-2025-8579 Inappropriate implementation in Gemini Live in Chrome | 4.3 | 0.0026 |  |
| [CVE-2025-8580](https://patchblox.com/security/data/cve/CVE-2025-8580.md) | Routine | Chromium: CVE-2025-8580 Inappropriate implementation in Filesystems | 4.3 | 0.0026 |  |
| [CVE-2025-8582](https://patchblox.com/security/data/cve/CVE-2025-8582.md) | Routine | Chromium: CVE-2025-8582 Insufficient validation of untrusted input in DOM | 4.3 | 0.0026 |  |
| [CVE-2025-8583](https://patchblox.com/security/data/cve/CVE-2025-8583.md) | Routine | Chromium: CVE-2025-8583 Inappropriate implementation in Permissions | 4.3 | 0.0024 |  |

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Data as of 2026-11-11T07:45:43Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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