{"status":"success","data":{"id":"CVE-2026-111497","slug":"cve-2026-111497-google-brotli","title":"Google Brotli Google Brotli Unchecked Return Value Vulnerability","summary":"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.","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.","severity":"CRITICAL","cvss_score":9.8,"cvss_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_metrics":{"scope":"UNCHANGED","integrity":"HIGH","attackVector":"NETWORK","availability":"HIGH","confidentiality":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","privilegesRequired":"NONE"},"epss_score":0.82641,"epss_percentile":0.99666,"cisa_kev":true,"cisa_date_added":"2026-10-27","cisa_due_date":"2026-11-10","ransomware_campaign":"Unknown","threat_actors":["Unknown In-The-Wild Threat Cluster"],"exploit_status":"active_wild","cwes":[{"id":"CWE-252","name":"Common Weakness Enumeration Flaw"},{"id":"CWE-787","name":"OS Command Injection"}],"affected_vendors":["Google"],"affected_products":[{"vendor":"Google","product":"Brotli","fixed_version":"Refer to vendor advisory for patch release","affected_versions":"All vulnerable builds prior to vendor emergency patch"}],"ai_analysis":{"sigma_rule":"title: Suspicious CVE-2026-111497 Activity\nstatus: high\nlogsource:\n  category: process_creation\ndetection:\n  selection:\n    CommandLine|contains: 'CVE-2026-111497'\n  condition: selection","analyzed_at":"2026-11-02T06:47:35.849Z","model_provider":"Gemini 2.0 Flash Security Sentinel","executive_summary":"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.","detection_guidance":"Monitor endpoint execution logs and network traffic for unusual connections originating from Brotli.","mitigation_playbook":["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.","Apply security updates according to vendor instructions.","Ensure network firewalls restrict exposure of administrative ports."],"technical_root_cause":"Vulnerability in Brotli allowing anomalous execution paths when processing untrusted input.","exploitation_mechanism":"Threat actors issue specially crafted requests to the target service to exploit memory corruption or logic flaws.","enterprise_blast_radius":"Potential unauthorized access, service disruption, and lateral movement within the perimeter."},"references":[{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-111497","type":"cisa","title":"CISA KEV Catalog Reference"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111497","type":"advisory","title":"NVD Official Detail"}],"published_at":"2026-10-27","updated_at":"2026-11-02"}}