First published Oct 27, 2026, 8:10:15 PM UTC · Last updated Oct 27, 2026, 8:10:15 PM UTC

CVE-2026-111497: Google Brotli Unchecked Return Value Vulnerability

Reported by CISA Known Exploited Vulnerabilities

The source describes an unchecked return value vulnerability in Google Brotli that could allow memory disclosure, denial of service, or potentially arbitrary code execution through a crafted compressed stream. It calls for mitigations following vendor instructions and applicable CISA guidance.

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Why it matters

The source advises stakeholders to assess asset exposure and apply mitigations, or discontinue use if mitigations are unavailable.

Generated scores

Scores are based on the cited reporting and use a 1–10 scale. Read the methodology.

Confidence: 6/10How certain the assessment is based on the clarity and evidence in the cited reporting.
Geographic reach: 1/10How widely the event reaches, from a local area (1) to worldwide impact (10).
Global importance: 3/10The event's broader significance, from limited importance (1) to major global importance (10).
Impact magnitude: 4/10The scale or severity of the real-world impact, from minor (1) to extreme (10).
Urgency: 5/10How time-sensitive the event is, from low urgency (1) to immediate attention needed (10).

Primary official sources

CISA Known Exploited Vulnerabilities CVE-2026-111497: Google Brotli Unchecked Return Value Vulnerability

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