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Vulnerability record · CVE-2026-111497 · published 22 October 2026

CVE-2026-111497: Google brotli unchecked return value vulnerability

Google · Brotli

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.

9.2 CVSS 4.0 Critical CISA KEV since 27 Oct 2026 EPSS 83% · top 0.3% CWE-252 · Unchecked return valueCWE-787 · Out-of-bounds write
9.2CVSS 4.0 base score
83%EPSS exploitation probability, 30 days
YesIn CISA KEV, fix deadline passed
61Affected product versions listed by NVD
24References
10 Nov 2026Last modified by NVD

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.

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:

Exploitation in the wild

CISA added CVE-2026-111497 to the Known Exploited Vulnerabilities catalog on 27 October 2026 as "Google Brotli Unchecked Return Value Vulnerability". Required 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. Federal deadline 10 November 2026.

Affected products

61 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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-permit 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
http://www.openwall.com/lists/oss-security/2026/11/03/2 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
https://github.com/google/brotli/releases/tag/v1.2.1 Release Notes
https://lists.debian.org/debian-lts-announce/2026/10/msg00049.html Mailing ListThird Party Advisory
https://patchtheplanet.org/brotli Third Party Advisory
https://www.aikido.dev/blog/node2shell-nodejs-brotli-rce-cve-2026-111497 Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-045512.html Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-242944.html Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-443410.html Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-678870.html Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-898633.html Third Party Advisory
https://ellio.tech/en/blog/node2shell-cve-2026-111497-rce-on-stock-nodejs-builds/ Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-111497 US Government Resource

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Source: NIST National Vulnerability Database (record CVE-2026-111497), CISA KEV, FIRST EPSS (scores of 2026-11-11). This page is refreshed as NVD updates the record.