CVE-2026-111497 (GCVE-0-2026-111497)

Vulnerability from cvelistv5 – Published: 2026-10-22 13:35 – Updated: 2026-10-28 03:55
VLAI CISA
Title
Out-of-Bounds Write in Google Brotli Decoder
Summary
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.
Severity
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
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-23 00:00 UTC
CWE
Assigner
Google CNA under the Google root
CNA scorecard B 77/100 over 40 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Google Brotli Affected: 1.0.3 , < 1.0.10 (semver)
Affected: 1.1.0 , < 1.1.1 (semver)
Affected: 1.2.0 , < 1.2.1 (semver)
guessed Create a notification for this product.
Date Public
2026-02-27 07:50
Credits
OpenAI Codex Security - Khai Tran and Sylvie Mayer
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: ea1662ce-1e27-4e77-bd1a-fbcdcd086e4d

Vulnerability ID: CVE-2026-111497

Status: Confirmed

Status Updated: 2026-10-27 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-10-27
Asserted: 2026-10-27
Scope
Notes: Google Brotli Unchecked Return Value Vulnerability | Affected: Google / Brotli | Description: Google Brotli contains an unchecked return value vulnerability that 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. | 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. | Due date: 2026-11-10 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: https://github.com/google/brotli/releases/tag/v1.2.1 ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-111497
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-252 CWE-787
Feed CISA Known Exploited Vulnerabilities Catalog
Product Brotli
Due Date 2026-11-10
Date Added 2026-10-27
Vendorproject Google
Vulnerabilityname Google Brotli Unchecked Return Value Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-10-27 20:00 UTC | Updated: 2026-10-27 20:00 UTC
Show details on NVD website
To clipboard 

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