{
  "cveId": "CVE-2026-87491",
  "url": "https://patchblox.com/security/cve/CVE-2026-87491",
  "summary": "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.",
  "title": "Chromium CVE-2026-87491:  Out of bounds write in V8",
  "description": "\u003Cp\u003EThis CVE was assigned by Chrome.  Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see \u003Ca href=\u0022https://chromereleases.googleblog.com/2026\u0022\u003EGoogle Chrome Releases\u003C/a\u003E for more information. Google is aware that an exploit for CVE-2026-87491 exists in the wild.\u003C/p\u003E",
  "published": "2026-09-09T01:17:05Z",
  "severity": "high",
  "cvss": 8.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "cwe": "CWE-787: Out of bounds write",
  "epss": 0.03507,
  "epssPercentile": 0.89263,
  "priority": "Patch now",
  "priorityTier": 1,
  "exploited": true,
  "vendorExploited": true,
  "disclosed": false,
  "kev": {
    "added": "2026-09-09T00:00:00Z",
    "due": "2026-09-23T00:00:00Z",
    "ransomware": false,
    "requiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201CForensics Triage Requirements\u201D (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset\u0027s internet exposure and ensuring adherence to BOD 26-04 patching guidelines."
  },
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87491",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "Google Chrome (EXE)",
      "fixedVersion": "153.0.8010.37",
      "fix": "Google Chrome (EXE) 153.0.8010.37",
      "url": "https://patchblox.com/security/fix/windows-app/google.chrome.exe-153.0.8010.37",
      "released": "2026-09-07T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Google Chrome Beta (EXE)",
      "fixedVersion": "154.0.8037.0",
      "fix": "Google Chrome Beta (EXE) 154.0.8037.0",
      "url": "https://patchblox.com/security/fix/windows-app/google.chrome.beta.exe-154.0.8037.0",
      "released": "2026-09-01T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Google Chrome Dev (EXE)",
      "fixedVersion": "154.0.8013.2",
      "fix": "Google Chrome Dev (EXE) 154.0.8013.2",
      "url": "https://patchblox.com/security/fix/windows-app/google.chrome.dev.exe-154.0.8013.2",
      "released": "2026-08-21T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Microsoft Edge",
      "fixedVersion": "153.0.4234.32",
      "fix": "Microsoft Edge 153.0.4234.32",
      "url": "https://patchblox.com/security/fix/windows-app/microsoft.edge-153.0.4234.32",
      "released": "2026-09-10T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Microsoft Edge Beta",
      "fixedVersion": "154.0.4258.12",
      "fix": "Microsoft Edge Beta 154.0.4258.12",
      "url": "https://patchblox.com/security/fix/windows-app/microsoft.edge.beta-154.0.4258.12",
      "released": "2026-09-11T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Microsoft Edge Dev",
      "fixedVersion": "154.0.4238.0",
      "fix": "Microsoft Edge Dev 154.0.4238.0",
      "url": "https://patchblox.com/security/fix/windows-app/microsoft.edge.dev-154.0.4238.0",
      "released": "2026-08-25T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Microsoft Edge WebView2 Runtime",
      "fixedVersion": "153.0.4234.46",
      "fix": "Microsoft Edge WebView2 Runtime 153.0.4234.46",
      "url": "https://patchblox.com/security/fix/windows-app/microsoft.edgewebview2runtime-153.0.4234.46",
      "released": "2026-09-17T00:00:00Z"
    },
    {
      "platform": "macos",
      "product": "Google Chrome",
      "fixedVersion": "153.0.8010.37",
      "fix": "Google Chrome 153.0.8010.37",
      "url": "https://patchblox.com/security/fix/macos/com.google.chrome-153.0.8010.37",
      "released": "2026-09-07T12:23:45Z"
    },
    {
      "platform": "macos",
      "product": "Microsoft Edge",
      "fixedVersion": "153.0.4234.32",
      "fix": "Microsoft Edge 153.0.4234.32",
      "url": "https://patchblox.com/security/fix/macos/com.microsoft.edgemac-153.0.4234.32",
      "released": "2026-09-10T07:11:53Z"
    },
    {
      "platform": "linux",
      "product": "chromium",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "153.0.8010.52-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-87491",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-87491",
      "released": "2026-09-18T18:19:38Z"
    },
    {
      "platform": "linux",
      "product": "chromium",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "153.0.8010.47-2~deb13u1",
      "fix": "DEBIAN-CVE-2026-87491",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-87491",
      "released": "2026-09-18T18:19:38Z"
    },
    {
      "platform": "linux",
      "product": "chromium",
      "release": "Debian 14",
      "fixedVersion": "153.0.8010.47-1",
      "fix": "DEBIAN-CVE-2026-87491",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-87491",
      "released": "2026-09-18T18:19:38Z"
    },
    {
      "platform": "linux",
      "product": "chromium",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "153.0.8010.52-bp160.1.1",
      "fix": "OPENSUSE-SU-2026:21921-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21921-1",
      "released": "2026-11-07T00:48:28Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}