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.
Published: 2026-10-22
Score: 9.2 Critical
EPSS: 82.6% High
KEV: Yes
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

Vendor Solution

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.

Tracking

Sign in to view the affected projects.

Advisories
Source ID Title
Debian DLA Debian DLA DLA-4855-1 brotli security update
Debian DSA Debian DSA DSA-6582-1 brotli security update
Github GHSA Github GHSA GHSA-9v8h-qqgm-4m35 Brotli: Out-of-bounds write in the Brotli decoder ("Node2Shell") also affects the PyPI Brotli package
Ubuntu USN Ubuntu USN USN-8956-1 Brotli vulnerability
Ubuntu USN Ubuntu USN USN-8956-2 Brotli vulnerability
Ubuntu USN Ubuntu USN USN-8958-1 .NET vulnerabilities
History

Fri, 30 Oct 2026 21:45:00 +0100

Type Values Removed Values Added
First Time appeared Siemens
Siemens common Configurator
Siemens data Flow Monitoring
Siemens edge Opc Ua Server Configurator
Siemens flow Creator Configurator
Siemens industrial Edge Cloud Connector Configurator
Siemens industrial Edge Databus Configurator
Siemens industrial Edge Hub
Siemens industrial Edge Management Cloud
Siemens ruggedcom Ape1808
Siemens ruggedcom Ape1808 Firmware
CPEs cpe:2.3:a:siemens:common_configurator:-:*:*:*:*:*:*:*
cpe:2.3:a:siemens:data_flow_monitoring:-:*:*:*:*:*:*:*
cpe:2.3:a:siemens:edge_opc_ua_server_configurator:-:*:*:*:*:*:*:*
cpe:2.3:a:siemens:flow_creator_configurator:-:*:*:*:*:*:*:*
cpe:2.3:a:siemens:industrial_edge_cloud_connector_configurator:-:*:*:*:*:*:*:*
cpe:2.3:a:siemens:industrial_edge_databus_configurator:-:*:*:*:*:*:*:*
cpe:2.3:a:siemens:industrial_edge_hub:-:*:*:*:*:*:*:*
cpe:2.3:a:siemens:industrial_edge_management_cloud:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:ruggedcom_ape1808:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:ruggedcom_ape1808_firmware:-:*:*:*:*:*:*:*
Vendors & Products Siemens
Siemens common Configurator
Siemens data Flow Monitoring
Siemens edge Opc Ua Server Configurator
Siemens flow Creator Configurator
Siemens industrial Edge Cloud Connector Configurator
Siemens industrial Edge Databus Configurator
Siemens industrial Edge Hub
Siemens industrial Edge Management Cloud
Siemens ruggedcom Ape1808
Siemens ruggedcom Ape1808 Firmware

Fri, 30 Oct 2026 20:30:00 +0100

Type Values Removed Values Added
References

Fri, 30 Oct 2026 12:30:00 +0100


Wed, 28 Oct 2026 19:00:00 +0100

Type Values Removed Values Added
First Time appeared 7-zip
7-zip p7zip
Andybalholm
Andybalholm brotli
Anthropic
Anthropic bun
Apache
Apache arrow
Clickhouse
Clickhouse clickhouse
Debian
Debian debian Linux
Duckdb
Duckdb duckdb
Envoyproxy
Envoyproxy envoy
Google woff2
Istio
Istio istio
Mcmilk
Mcmilk 7-zip-zstd
Microsoft
Microsoft .net
Nodejs node.js
Python-hyper
Python-hyper brotlicffi
Tianocore
Tianocore edk2
CPEs cpe:2.3:a:7-zip:p7zip:*:*:*:*:*:*:*:*
cpe:2.3:a:andybalholm:brotli:*:*:*:*:*:go:*:*
cpe:2.3:a:anthropic:bun:*:*:*:*:*:*:*:*
cpe:2.3:a:apache:arrow:*:*:*:*:*:*:*:*
cpe:2.3:a:apache:arrow:27.0.0:dev:*:*:*:*:*:*
cpe:2.3:a:clickhouse:clickhouse:*:*:*:*:*:*:*:*
cpe:2.3:a:duckdb:duckdb:*:*:*:*:*:*:*:*
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
cpe:2.3:a:google:brotli:*:*:*:*:*:-:*:*
cpe:2.3:a:google:woff2:-:*:*:*:*:*:*:*
cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*
cpe:2.3:a:mcmilk:7-zip-zstd:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net:11.0.0:preview1:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net:11.0.0:preview2:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net:11.0.0:preview3:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net:11.0.0:preview4:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net:11.0.0:preview5:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net:11.0.0:preview6:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net:11.0.0:preview7:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net:11.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net:11.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
cpe:2.3:a:python-hyper:brotlicffi:*:*:*:*:*:python:*:*
cpe:2.3:a:tianocore:edk2:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*
Vendors & Products 7-zip
7-zip p7zip
Andybalholm
Andybalholm brotli
Anthropic
Anthropic bun
Apache
Apache arrow
Clickhouse
Clickhouse clickhouse
Debian
Debian debian Linux
Duckdb
Duckdb duckdb
Envoyproxy
Envoyproxy envoy
Google woff2
Istio
Istio istio
Mcmilk
Mcmilk 7-zip-zstd
Microsoft
Microsoft .net
Nodejs node.js
Python-hyper
Python-hyper brotlicffi
Tianocore
Tianocore edk2
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Tue, 27 Oct 2026 21:30:00 +0100

Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 27 Oct 2026 21:00:00 +0100

Type Values Removed Values Added
Metrics kev

{'dateAdded': '2026-10-27T00:00:00+00:00', 'dueDate': '2026-11-10T00:00:00+00:00'}


Tue, 27 Oct 2026 16:15:00 +0100

Type Values Removed Values Added
References

Mon, 26 Oct 2026 19:30:00 +0100

Type Values Removed Values Added
References

Mon, 26 Oct 2026 15:30:00 +0100

Type Values Removed Values Added
References

Mon, 26 Oct 2026 06:30:00 +0100


Mon, 26 Oct 2026 05:30:00 +0100


Sat, 24 Oct 2026 20:30:00 +0200

Type Values Removed Values Added
References

Sat, 24 Oct 2026 01:30:00 +0200


Sat, 24 Oct 2026 00:30:00 +0200

Type Values Removed Values Added
References

Fri, 23 Oct 2026 16:30:00 +0200


Fri, 23 Oct 2026 15:30:00 +0200


Fri, 23 Oct 2026 14:30:00 +0200

Type Values Removed Values Added
First Time appeared Redhat
Redhat hummingbird
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics threat_severity

None

cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important


Fri, 23 Oct 2026 11:00:00 +0200

Type Values Removed Values Added
First Time appeared Nodejs
Nodejs nodejs
Vendors & Products Nodejs
Nodejs nodejs

Fri, 23 Oct 2026 02:45:00 +0200

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 22 Oct 2026 16:30:00 +0200

Type Values Removed Values Added
First Time appeared Google
Google brotli
Vendors & Products Google
Google brotli

Thu, 22 Oct 2026 15:45:00 +0200

Type Values Removed Values Added
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.
Title Out-of-Bounds Write in Google Brotli Decoder
Weaknesses CWE-252
CWE-787
References
Metrics cvssV4_0

{'score': 9.2, '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'}


Subscriptions

7-zip P7zip
Andybalholm Brotli
Anthropic Bun
Apache Arrow
Clickhouse Clickhouse
Debian Debian Linux
Duckdb Duckdb
Envoyproxy Envoy
Google Brotli Woff2
Istio Istio
Mcmilk 7-zip-zstd
Microsoft .net
Nodejs Node.js Nodejs
Python-hyper Brotlicffi
Redhat Hummingbird
Siemens Common Configurator Data Flow Monitoring Edge Opc Ua Server Configurator Flow Creator Configurator Industrial Edge Cloud Connector Configurator Industrial Edge Databus Configurator Industrial Edge Hub Industrial Edge Management Cloud Ruggedcom Ape1808 Ruggedcom Ape1808 Firmware
Tianocore Edk2
cve-icon MITRE

Status: PUBLISHED

Assigner: Google

Published:

Updated: 2026-10-30T18:31:38.139Z

Reserved: 2026-10-16T09:58:17.790Z

Link: CVE-2026-111497

cve-icon Vulnrichment

Updated: 2026-10-26T18:10:34.928Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-22T14:17:37.190

Modified: 2026-10-30T20:30:11.670

Link: CVE-2026-111497

cve-icon Redhat

Severity : Important

Publid Date: 2026-10-22T13:35:41Z

Links: CVE-2026-111497 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-29T21:30:18Z

Weaknesses