Public vulnerability disclosure

Open

CVE-2026-111497

Out-of-Bounds Write in Google Brotli Decoder

publishedKnown exploited · CISA KEVCWE-787CWE-252

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.

Technical severity9.2 criticalCVSS 4.0 · CNA: Google

Published2026-10-22Source updated 2026-11-04

Collected2026-11-045 attributed sources

Fixes and workarounds

Fix

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.

Source: CNA: Google

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: Google

Fix

brotli (PyPI): OSV reports a fixed version 1.2.1. Check the advisory for supported release branches.

Source: OSV GHSA-9v8h-qqgm-4m35

Fix

brotlicffi (PyPI): OSV reports a fixed version 1.2.1.0. Check the advisory for supported release branches.

Source: OSV GHSA-9v8h-qqgm-4m35

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Brotli Google `github.com/google/brotli`	≥ 1.0.3; < 1.0.10 (affected, semver) ≥ 1.1.0; < 1.1.1 (affected, semver) ≥ 1.2.0; < 1.2.1 (affected, semver) Other versions: unaffected	CNA: Google
Desigo CC family V8 Siemens	≥ 0; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
Desigo CC family V9 Siemens	≥ 0; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
Heliox Dual Port 60kW Siemens	≥ 0; < * (unaffected, custom) Other versions: unknown	ADP: siemens-SADP
Heliox Flex Pro Siemens	≥ 0; < * (unaffected, custom) Other versions: unknown	ADP: siemens-SADP
SICHARGE FLEX Siemens	≥ 0; < * (unaffected, custom) Other versions: unknown	ADP: siemens-SADP
SICHARGE UC Siemens	≥ 0; < * (unaffected, custom) Other versions: unknown	ADP: siemens-SADP
Sifinity Go Siemens	≥ 0; < * (unaffected, custom) Other versions: unknown	ADP: siemens-SADP
Sifinity Setup Siemens	≥ 0; < * (unaffected, custom) Other versions: unknown	ADP: siemens-SADP
VersiCharge AC Series Siemens	≥ 0; < * (unaffected, custom) Other versions: unknown	ADP: siemens-SADP
VersiCloud Siemens	≥ 0; < * (unaffected, custom) Other versions: unknown	ADP: siemens-SADP
Cloud Connector Configurator Siemens	≥ 0; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
Common Configurator (CC on IEM) Siemens	≥ 0; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
Common Configurator on Device (CC on Edge) Siemens	≥ 0; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
Data Flow Monitoring Siemens	≥ 0; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
Databus Configurator Siemens	≥ 0; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
Edge OPC UA Server Configurator Siemens	≥ 0; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
Flow Creator Configurator Siemens	≥ 0; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
Industrial Edge Hub Siemens	≥ 0; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
Industrial Edge Management Cloud Siemens	≥ 0; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
RUGGEDCOM APE1808 Siemens	≥ 0; < * (affected, custom) Other versions: unknown	ADP: siemens-SADP
brotli `brotli` PyPI	1.0.4 (affected, PyPI) 1.0.6 (affected, PyPI) 1.0.7 (affected, PyPI) 1.0.8 (affected, PyPI) 1.0.9 (affected, PyPI) 1.1.0 (affected, PyPI) 1.2.0 (affected, PyPI) Ecosystem version events: introduced 1.0.3; fixed 1.2.1 Source events (ECOSYSTEM) `[ { "introduced": "1.0.3" }, { "fixed": "1.2.1" } ]` Other versions: unaffected	OSV GHSA-9v8h-qqgm-4m35
brotlicffi `brotlicffi` PyPI	1.0.9.0 (affected, PyPI) 1.0.9.1 (affected, PyPI) 1.0.9.2 (affected, PyPI) 1.1.0.0 (affected, PyPI) 1.2.0.0 (affected, PyPI) 1.2.0.1 (affected, PyPI) 1.2.0.2 (affected, PyPI) Ecosystem version events: introduced 1.0.3; fixed 1.2.1.0 Source events (ECOSYSTEM) `[ { "introduced": "1.0.3" }, { "fixed": "1.2.1.0" } ]` Other versions: unaffected	OSV GHSA-9v8h-qqgm-4m35

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

NVD applicability configurations (18)

These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.

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CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
4.0 / 9.2 critical	`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`	CNA: Google
4.0 / 9.2 critical	`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`	NVD: [email protected]
3.1 / 9.8 critical	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`	NVD: [email protected]

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://nodejs.org/en/blog/vulnerability/october-2026-security-releases#nodejs-brotli-decoder-out-of-bounds-write-permits-remote-code-execution-cve-2026-111497---highCNA: Google · patch
https://github.com/andybalholm/brotli/releases/tag/v1.2.7CNA: Google · release-notes, third-party-advisory
https://ellio.tech/en/blog/node2shell-cve-2026-111497-rce-on-stock-nodejs-builds/ADP: CISA-ADP · third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-111497ADP: CISA-ADP · government-resource
https://github.com/advisories/GHSA-9v8h-qqgm-4m35ADP: CVE
http://www.openwall.com/lists/oss-security/2026/10/23/25ADP: CVE
https://lists.debian.org/debian-lts-announce/2026/10/msg00049.htmlADP: CVE
http://www.openwall.com/lists/oss-security/2026/10/24/6ADP: CVE
http://www.openwall.com/lists/oss-security/2026/10/26/12ADP: CVE
http://www.openwall.com/lists/oss-security/2026/10/26/13ADP: CVE
https://www.aikido.dev/blog/node2shell-nodejs-brotli-rce-cve-2026-111497ADP: CVE
https://broccoli2shell.com/ADP: CVE
https://github.com/dotnet/announcements/issues/494ADP: CVE
https://github.com/google/brotli/releases/tag/v1.2.1ADP: CVE
https://github.com/google/brotli/releases/tag/v1.1.1ADP: CVE
https://github.com/google/brotli/releases/tag/v1.0.10ADP: CVE
https://patchtheplanet.org/brotliADP: CVE
http://www.openwall.com/lists/oss-security/2026/10/26/16ADP: CVE
http://www.openwall.com/lists/oss-security/2026/11/03/2ADP: CVE
https://cert-portal.siemens.com/productcert/html/ssa-898633.htmlADP: siemens-SADP
https://cert-portal.siemens.com/productcert/html/ssa-443410.htmlADP: siemens-SADP
https://cert-portal.siemens.com/productcert/html/ssa-045512.htmlADP: siemens-SADP
https://github.com/andybalholm/brotli/releases/tag/v1.2.7[email protected] · 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[email protected] · Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/10/23/25af854a3a-2127-422b-91ae-364da2661108 · Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/10/24/6af854a3a-2127-422b-91ae-364da2661108 · Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/10/26/12af854a3a-2127-422b-91ae-364da2661108 · Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/10/26/13af854a3a-2127-422b-91ae-364da2661108 · Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/10/26/16af854a3a-2127-422b-91ae-364da2661108 · Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/11/03/2af854a3a-2127-422b-91ae-364da2661108
https://broccoli2shell.com/af854a3a-2127-422b-91ae-364da2661108 · Third Party Advisory
https://github.com/advisories/GHSA-9v8h-qqgm-4m35af854a3a-2127-422b-91ae-364da2661108 · Third Party Advisory
https://github.com/dotnet/announcements/issues/494af854a3a-2127-422b-91ae-364da2661108 · Issue Tracking, Mitigation, Third Party Advisory
https://github.com/google/brotli/releases/tag/v1.0.10af854a3a-2127-422b-91ae-364da2661108 · Release Notes
https://github.com/google/brotli/releases/tag/v1.1.1af854a3a-2127-422b-91ae-364da2661108 · Release Notes
https://github.com/google/brotli/releases/tag/v1.2.1af854a3a-2127-422b-91ae-364da2661108 · Release Notes
https://lists.debian.org/debian-lts-announce/2026/10/msg00049.htmlaf854a3a-2127-422b-91ae-364da2661108 · Mailing List, Third Party Advisory
https://patchtheplanet.org/brotliaf854a3a-2127-422b-91ae-364da2661108 · Third Party Advisory
https://www.aikido.dev/blog/node2shell-nodejs-brotli-rce-cve-2026-111497af854a3a-2127-422b-91ae-364da2661108 · Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-045512.html0b142b55-0307-4c5a-b3c9-f314f3fb7c5e · Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-443410.html0b142b55-0307-4c5a-b3c9-f314f3fb7c5e · Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-898633.html0b142b55-0307-4c5a-b3c9-f314f3fb7c5e · Third Party Advisory
https://ellio.tech/en/blog/node2shell-cve-2026-111497-rce-on-stock-nodejs-builds/134c704f-9b21-4f2e-91b3-4a467353bcc0 · Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-111497134c704f-9b21-4f2e-91b3-4a467353bcc0 · US Government Resource
https://github.com/advisories/GHSA-9v8h-qqgm-4m35OSV / GitHub Security Advisories · advisory
https://osv.dev/vulnerability/GHSA-9v8h-qqgm-4m35OSV / GitHub Security Advisories · osv

Prioritization

CISA known exploited vulnerabilities

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.

Added 2026-10-27 · KEV action due 2026-11-10
Known ransomware use: Not confirmed in this record

EPSS

82.64% estimated probability of exploitation in the next 30 days; percentile 99.67.
Assessed 2026-11-04 by FIRST.

SSVC

Exploitation: active
Automatable: no
Technical impact: total

ADP: CISA-ADP · 2026-10-23

Provenance

CNA: Google
Source updated 2026-11-04
Retrieved 2026-11-04

NVD
Source updated 2026-11-03
Retrieved 2026-11-04

OSV / GitHub Security Advisories
Source updated 2026-11-03
Retrieved 2026-11-03

CISA KEV
Source updated Not reported
Retrieved 2026-11-02

FIRST EPSS
Source updated Not reported
Retrieved 2026-11-04

Disclosure revision
5ac2c7ad61b432017acc0a8bc52b677b78f617d8a823625668cfb33c4374e106

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Endpoints and access details

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