---
title: "CVE-2026-111497: Google Brotli - Buffer Overflow"
description: "Google Brotli 1.0.3 through 1.2.0 contains a buffer overflow caused by improper handling in the decoder component, letting remote unauthenticated attackers corrupt memory, disclose data, cause DoS, or execute code using crafted Brotli streams."
url: https://panop.io/threat-heartbeat/CVE-2026-111497/
---

# CVE-2026-111497 Google Brotli - Buffer Overflow

Google Brotli 1.0.3 through 1.2.0 contains a buffer overflow caused by improper handling in the decoder component, letting remote unauthenticated attackers corrupt memory, disclose data, cause DoS, or execute code using crafted Brotli streams.

CVSS base score 9.2 /10

Critical

CISA KEV

Not listed

Public exploit

Proof of concept available

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-111497)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Information Disclosure, Denial Of Service

CVSS 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/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

Published

22 October 2026

Updated

23 October 2026

Weakness

[CWE-252](https://cwe.mitre.org/data/definitions/252.html)

## Vendor fix

Update to version 1.0.10, 1.1.1, 1.2.1 or latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-111497](https://nvd.nist.gov/vuln/detail/CVE-2026-111497)
- [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](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)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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