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CVE-2026-111497

9.2, critical Known exploited

Google Brotli Unchecked Return Value Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.2, critical critical CVSS v4.0
EPSS, next 30 days
55% higher than 99% of scored CVEs
Exploitation
Confirmed in the wild
Published
22 Oct 20266 days ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 27 Oct 2026. US federal agencies must remediate by 10 Nov 2026.

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.

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.

Details

Vendor
Google
Product
Brotli
Weakness
CWE-252 (opens in a new tab)
Status
Undergoing analysis
Updated
27 Oct 2026
Assigner
cve-coordination@google.com

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

References 18

Patches and fixes 1

Advisories 6

Other references 11

3 more

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Google CVEs

Every Google CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-58704 Google Pixel Improper Authorization Vulnerability KEV EPSS 0.6% 8.8, high
  • CVE-2026-87491 Google Chromium V8 Out of Bounds Write Vulnerability KEV EPSS 4% 8.8, high
  • CVE-2026-85046 Google Chromium V8 Type Confusion Vulnerability KEV EPSS 2% 8.8, high
  • CVE-2026-11645 Google Chromium V8 Out-of-Bounds Read and Write Vulnerability KEV EPSS 2% 8.8, high
  • CVE-2026-5281 Google Dawn Use-After-Free Vulnerability KEV EPSS 14% 8.8, high
  • CVE-2026-3909 Google Skia Out-of-Bounds Write Vulnerability KEV EPSS 2% 8.8, high
  • CVE-2026-3910 Google Chromium V8 Improper Restriction of Operations Within the Bounds of a Memory Buffer Vulnerability KEV EPSS 3% 8.8, high
  • CVE-2026-2441 Google Chromium CSS Use-After-Free Vulnerability KEV EPSS 55% 8.8, high

Beyond this page

Is CVE-2026-111497 in your network?

This page tells you how dangerous CVE-2026-111497 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2026-111497 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-111497 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 28 Oct 2026, not the live upstream state.