— Unscored

Google Brotli Unchecked Return Value Vulnerability

CVE-2026-111497 Exploited

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.

Being exploited in the wild

Catalogued 27 October 2026 · US federal remediation deadline 10 November 2026

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…

Exploit code is also public: Public PoC

Public PoCassetnote/node2shell-scanner84 stars
Public PoCdimasma0305/CVE-2026-111497-POC73 stars
Public PoCtrailofbits/brotli-checker66 stars
Public PoCsyrex1013/CVE-2026-111497-node2shell50 stars
Public PoCcaveeroo/cve-2026-111497-wordpress-poc28 stars
Public PoCCaterMaoZi/CVE-2026-111497-POC17 stars
Public PoCZeroHackOrg/node2shell-poc8 stars
Public PoChypnguyen1209/CVE-2026-1114977 stars

Assessment

CVSS: Not yet scored
Severity: Unscored
Known exploited: Yes — listed in the CISA KEV catalog
Exploit availability: CISA KEV, Public PoC
Published: 27 October 2026
Last updated: 27 October 2026
Affected: Google · Brotli
Weakness: CWE-252, CWE-787

At the source

CISA KEV

References

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