CVE-2026-111497

9.8 · CRITICALActively Exploited

Published Oct 22, 2026googleCWE-252EPSS 82.64%CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Overview

CVE-2026-111497 is a critical-severity vulnerability affecting google brotli. It was published on October 22, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from google. Update brotli to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

Vendor	Product	Versions	Status
google	brotli	>= 1.0.3, < 1.0.10	Affected
nodejs	node.js	>= 0, < 22.23.4	Affected
python-hyper	brotlicffi	>= 0, < 1.2.1.0	Affected
microsoft	.net	>= 8.0.0, < 8.0.33	Affected
istio	istio	>= 0, < 1.29.9	Affected
anthropic	bun	>= 0, < 1.4.4	Affected
envoyproxy	envoy	>= 0, < 1.37.8	Affected
tianocore	edk2	0	Affected
duckdb	duckdb	0	Affected
clickhouse	clickhouse	0	Affected
apache	arrow	0	Affected
mcmilk	7-zip-zstd	0	Affected
7-zip	p7zip	0	Affected
andybalholm	brotli	>= 0, < 1.2.7	Affected

References

GitHubgithub.com/andybalholm/brotli/releases/tag/v1.2.7 Refnodejs.org/en/blog/vulnerability/october-2026-security-releases#nodejs-brotli-decoder-out-of-bounds-write-permits-remote-code-execution-cve-2026-111497---high Refwww.openwall.com/lists/oss-security/2026/10/23/25 Refwww.openwall.com/lists/oss-security/2026/10/24/6 Refwww.openwall.com/lists/oss-security/2026/10/26/12 Refwww.openwall.com/lists/oss-security/2026/10/26/13 Refwww.openwall.com/lists/oss-security/2026/10/26/16 Refbroccoli2shell.com GitHubgithub.com/advisories/GHSA-9v8h-qqgm-4m35 GitHubgithub.com/dotnet/announcements/issues/494

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Frequently asked questions

What is CVE-2026-111497?

How severe is CVE-2026-111497?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-111497?

How can CyberStrike help with CVE-2026-111497?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-111497 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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