{
  "id": "CVE-2026-111497",
  "url": "https://spydr.io/cve/CVE-2026-111497",
  "published": "2026-10-22T14:17:37.190Z",
  "modified": "2026-10-28T04:17:56.950Z",
  "score": 9.2,
  "severity": "critical",
  "cvss_version": "4.0",
  "vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
  "score_source": "google.com",
  "epss": 0.55483,
  "epss_percentile": 0.9903,
  "exploited": true,
  "kev": {
    "added": "2026-10-27",
    "due": "2026-11-10",
    "action": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (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's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
    "ransomware": "Unknown",
    "name": "Google Brotli Unchecked Return Value Vulnerability",
    "notes": "This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/google/brotli/releases/tag/v1.2.1 ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-111497"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "Google"
  ],
  "products": [
    "Google Brotli"
  ],
  "cwes": [
    "CWE-252",
    "CWE-787"
  ],
  "description": "A buffer overflow vulnerability in the Brotli decoder (c/dec/decode.c) in Google Brotli versions 1.0.3 through 1.2.0 on all platforms allows a remote unauthenticated attacker to corrupt adjacent decoder state memory, disclose sensitive memory contents, cause a denial of service, or potentially execute arbitrary code using a crafted Brotli-compressed stream. Users need to update any Brotli libraries or binaries between 1.0.3 through 1.2.0 to the latest available version: 1.0.10 or 1.1.1 or 1.2.1.",
  "status": "Undergoing Analysis",
  "score_type": "Secondary",
  "scores": {
    "cvss_v40": 9.2,
    "cvss_v31": null,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://github.com/andybalholm/brotli/releases/tag/v1.2.7",
      "tags": []
    },
    {
      "url": "https://nodejs.org/en/blog/vulnerability/october-2026-security-releases#nodejs-brotli-decoder-out-of-bounds-write-permits-remote-code-execution-cve-2026-111497---high",
      "tags": []
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/10/23/25",
      "tags": []
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/10/24/6",
      "tags": []
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/10/26/12",
      "tags": []
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/10/26/13",
      "tags": []
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/10/26/16",
      "tags": []
    },
    {
      "url": "https://broccoli2shell.com/",
      "tags": []
    },
    {
      "url": "https://github.com/advisories/GHSA-9v8h-qqgm-4m35",
      "tags": []
    },
    {
      "url": "https://github.com/dotnet/announcements/issues/494",
      "tags": []
    },
    {
      "url": "https://github.com/google/brotli/releases/tag/v1.0.10",
      "tags": []
    },
    {
      "url": "https://github.com/google/brotli/releases/tag/v1.1.1",
      "tags": []
    },
    {
      "url": "https://github.com/google/brotli/releases/tag/v1.2.1",
      "tags": []
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2026/10/msg00049.html",
      "tags": []
    },
    {
      "url": "https://patchtheplanet.org/brotli",
      "tags": []
    },
    {
      "url": "https://www.aikido.dev/blog/node2shell-nodejs-brotli-rce-cve-2026-111497",
      "tags": []
    },
    {
      "url": "https://ellio.tech/en/blog/node2shell-cve-2026-111497-rce-on-stock-nodejs-builds/",
      "tags": []
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-111497",
      "tags": []
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111497",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}