Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since October 27, 2026.
CVE-2026-111497
Google Brotli Unchecked Return Value Vulnerability
Added to KEV October 27, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2026-111497
- CWE
- CWE-252CWE-787
- Affected products
- Brotli · Google Brotli · Google
What happened
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.
What it means for your business
Google Brotli is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-111497). 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. CISA remediation due date: 2026-11-10. If you need help checking exposure, call (864) 335-9223.
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.
CISA due date: November 10, 2026
Sources
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