# CVE-2026-87491: Chromium CVE-2026-87491:  Out of bounds write in V8

CVE-2026-87491 is fixed in 9 products on 3 platforms, first by Google Chrome Dev (EXE) 154.0.8013.2, released August 21, 2026. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on September 9, 2026. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/cve/CVE-2026-87491
- Priority: Patch now
- CVSS: 8.8 (high)
- EPSS: 0.0351
- CISA KEV: listed Sep 9, 2026, federal due date Sep 23, 2026
- Exploited (vendor report): yes
- Publicly disclosed: no
- Published: Sep 9, 2026
- Weakness: CWE-787: Out of bounds write
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87491

## 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/2026">Google Chrome Releases</a> for more information. Google is aware that an exploit for CVE-2026-87491 exists in the wild.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Google Chrome (EXE) | 153.0.8010.37 | [Google Chrome (EXE) 153.0.8010.37](https://patchblox.com/security/data/fix/windows-app/google.chrome.exe-153.0.8010.37.md) | Sep 7, 2026 |
| Windows apps | Google Chrome Beta (EXE) | 154.0.8037.0 | [Google Chrome Beta (EXE) 154.0.8037.0](https://patchblox.com/security/data/fix/windows-app/google.chrome.beta.exe-154.0.8037.0.md) | Sep 1, 2026 |
| Windows apps | Google Chrome Dev (EXE) | 154.0.8013.2 | [Google Chrome Dev (EXE) 154.0.8013.2](https://patchblox.com/security/data/fix/windows-app/google.chrome.dev.exe-154.0.8013.2.md) | Aug 21, 2026 |
| Windows apps | Microsoft Edge | 153.0.4234.32 | [Microsoft Edge 153.0.4234.32](https://patchblox.com/security/data/fix/windows-app/microsoft.edge-153.0.4234.32.md) | Sep 10, 2026 |
| Windows apps | Microsoft Edge Beta | 154.0.4258.12 | [Microsoft Edge Beta 154.0.4258.12](https://patchblox.com/security/data/fix/windows-app/microsoft.edge.beta-154.0.4258.12.md) | Sep 11, 2026 |
| Windows apps | Microsoft Edge Dev | 154.0.4238.0 | [Microsoft Edge Dev 154.0.4238.0](https://patchblox.com/security/data/fix/windows-app/microsoft.edge.dev-154.0.4238.0.md) | Aug 25, 2026 |
| Windows apps | Microsoft Edge WebView2 Runtime | 153.0.4234.46 | [Microsoft Edge WebView2 Runtime 153.0.4234.46](https://patchblox.com/security/data/fix/windows-app/microsoft.edgewebview2runtime-153.0.4234.46.md) | Sep 17, 2026 |
| macOS | Google Chrome | 153.0.8010.37 | [Google Chrome 153.0.8010.37](https://patchblox.com/security/data/fix/macos/com.google.chrome-153.0.8010.37.md) | Sep 7, 2026 |
| macOS | Microsoft Edge | 153.0.4234.32 | [Microsoft Edge 153.0.4234.32](https://patchblox.com/security/data/fix/macos/com.microsoft.edgemac-153.0.4234.32.md) | Sep 10, 2026 |
| Linux | chromium Debian 12.15 (bookworm) | 153.0.8010.52-1~deb12u1 | [DEBIAN-CVE-2026-87491](https://patchblox.com/security/data/fix/linux/debian-cve-2026-87491.md) | Sep 18, 2026 |
| Linux | chromium Debian 13.5 (trixie) | 153.0.8010.47-2~deb13u1 | [DEBIAN-CVE-2026-87491](https://patchblox.com/security/data/fix/linux/debian-cve-2026-87491.md) | Sep 18, 2026 |
| Linux | chromium Debian 14 | 153.0.8010.47-1 | [DEBIAN-CVE-2026-87491](https://patchblox.com/security/data/fix/linux/debian-cve-2026-87491.md) | Sep 18, 2026 |
| Linux | chromium opensuse-leap 16.0 | 153.0.8010.52-bp160.1.1 | [OPENSUSE-SU-2026:21921-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21921-1.md) | Nov 7, 2026 |

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Data as of 2026-11-08T06:59:42Z 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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