# CVE-2026-9986: Chromium: CVE-2026-9986 Insufficient validation of untrusted input in OptimizationGuide

CVE-2026-9986 is fixed in 9 products on 3 platforms, first by Google Chrome Dev (EXE) 149.0.7779.3, released April 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-9986
- Priority: Routine
- CVSS: 4.2 (medium)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 28, 2026
- Weakness: CWE-20: Insufficient validation of untrusted input
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-9986

## Description

<p>This CVE was assigned by Chrome.  Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see <a href="https://chromereleases.googleblog.com/2021">Google Chrome Releases</a> for more information.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Google Chrome (EXE) | 148.0.7778.217 | [Google Chrome (EXE) 148.0.7778.217](https://patchblox.com/security/data/fix/windows-app/google.chrome.exe-148.0.7778.217.md) | May 27, 2026 |
| Windows apps | Google Chrome Beta (EXE) | 149.0.7827.3 | [Google Chrome Beta (EXE) 149.0.7827.3](https://patchblox.com/security/data/fix/windows-app/google.chrome.beta.exe-149.0.7827.3.md) | May 6, 2026 |
| Windows apps | Google Chrome Dev (EXE) | 149.0.7779.3 | [Google Chrome Dev (EXE) 149.0.7779.3](https://patchblox.com/security/data/fix/windows-app/google.chrome.dev.exe-149.0.7779.3.md) | Apr 9, 2026 |
| Windows apps | Microsoft Edge | 148.0.3967.96 | [Microsoft Edge 148.0.3967.96](https://patchblox.com/security/data/fix/windows-app/microsoft.edge-148.0.3967.96.md) | May 28, 2026 |
| Windows apps | Microsoft Edge Beta | 151.0.4129.59 | [Microsoft Edge Beta 151.0.4129.59](https://patchblox.com/security/data/fix/windows-app/microsoft.edge.beta-151.0.4129.59.md) | Jul 31, 2026 |
| Windows apps | Microsoft Edge Dev | 152.0.4167.0 | [Microsoft Edge Dev 152.0.4167.0](https://patchblox.com/security/data/fix/windows-app/microsoft.edge.dev-152.0.4167.0.md) | Jul 20, 2026 |
| Windows apps | Microsoft Edge WebView2 Runtime | 148.0.3967.96 | [Microsoft Edge WebView2 Runtime 148.0.3967.96](https://patchblox.com/security/data/fix/windows-app/microsoft.edgewebview2runtime-148.0.3967.96.md) | May 28, 2026 |
| macOS | Google Chrome | 148.0.7778.216 | [Google Chrome 148.0.7778.216](https://patchblox.com/security/data/fix/macos/com.google.chrome-148.0.7778.216.md) | May 26, 2026 |
| macOS | Microsoft Edge | 149.0.4022.80 | [Microsoft Edge 149.0.4022.80](https://patchblox.com/security/data/fix/macos/com.microsoft.edgemac-149.0.4022.80.md) | Jun 17, 2026 |
| Linux | chromium Debian 12.15 (bookworm) | 148.0.7778.215-1~deb12u1 | [DEBIAN-CVE-2026-9986](https://patchblox.com/security/data/fix/linux/debian-cve-2026-9986.md) | Jun 24, 2026 |
| Linux | chromium Debian 13.5 (trixie) | 148.0.7778.215-1~deb13u1 | [DEBIAN-CVE-2026-9986](https://patchblox.com/security/data/fix/linux/debian-cve-2026-9986.md) | Jun 24, 2026 |
| Linux | chromium Debian 14 | 148.0.7778.215-1 | [DEBIAN-CVE-2026-9986](https://patchblox.com/security/data/fix/linux/debian-cve-2026-9986.md) | Jun 24, 2026 |
| Linux | chromium opensuse-leap 16.0 | 148.0.7778.215-bp160.1.1 | [OPENSUSE-SU-2026:20849-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20849-1.md) | Aug 31, 2026 |

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Data as of 2026-11-07T18:46:35Z 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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