CVE-2026-111497（google brotli）の深刻度・悪用状況・対象バージョン
9.8 緊急（CVSS 3.x） 悪用確認済み（CISA KEV） EPSS 取得中…
概要
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.
実際の攻撃で悪用されています。 CISA KEV への追加日: 2026-10-27。対象製品を使っている場合は最優先で対策してください。
CISA の要求対応: 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.
CISA の要求対応: 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.
影響を受ける製品
| ベンダー | 製品 | 対象バージョン |
|---|---|---|
| brotli | ≥ 1.0.3 かつ < 1.0.10 | |
| brotli | ≥ 1.1.0 かつ < 1.1.1 | |
| brotli | ≥ 1.2.0 かつ < 1.2.1 | |
| nodejs | node.js | < 22.23.4 |
| nodejs | node.js | ≥ 23.0.0 かつ < 24.22.1 |
| nodejs | node.js | ≥ 25.0.0 かつ < 26.12.1 |
| python-hyper | brotlicffi | < 1.2.1.0 |
| microsoft | .net | ≥ 8.0.0 かつ < 8.0.33 |
| microsoft | .net | ≥ 9.0.0 かつ < 9.0.22 |
| microsoft | .net | ≥ 10.0.0 かつ < 10.0.14 |
| microsoft | .net | 11.0.0 |
| microsoft | .net | 11.0.0 |
| microsoft | .net | 11.0.0 |
| microsoft | .net | 11.0.0 |
| microsoft | .net | 11.0.0 |
基本情報
- 公開日
- 2026-10-22
- 最終更新
- 2026-10-30
- NVD の状態
- Analyzed
- 弱点の種類
- CWE-252 CWE-787
- CVSS 4.0
- 9.2（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）
対策の進め方
- 上の表で、使っている製品とバージョンが対象か確認します。
- ベンダーの公式アドバイザリ（下の参考情報の「Vendor Advisory」「Patch」）で修正版・回避策を確認します。
- 悪用が確認されているため、パッチ適用までの間もアクセス制限・侵害の痕跡確認を検討します。
- 日本語の情報は JVN iPedia で CVE-2026-111497 を検索 できます。
参考情報
- https://github.com/andybalholm/brotli/releases/tag/v1.2.7 Release Notes
- 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 Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/23/25 Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/24/6 Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/26/12 Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/26/13 Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/26/16 Mailing ListThird Party Advisory
- https://broccoli2shell.com Third Party Advisory
- https://github.com/advisories/GHSA-9v8h-qqgm-4m35 Third Party Advisory
- https://github.com/dotnet/announcements/issues/494 Issue TrackingMitigationThird Party Advisory
- https://github.com/google/brotli/releases/tag/v1.0.10 Release Notes
- https://github.com/google/brotli/releases/tag/v1.1.1 Release Notes
- NVD: CVE-2026-111497
- CVE.org: CVE-2026-111497
データ出典: NIST NVD、CISA KEV、FIRST EPSS。翻訳は参考情報で、正確性は原文を優先してください。