{"api_version":"1","generated_at":"2026-10-03T01:57:51+00:00","cve":"CVE-2026-20276","urls":{"html":"https://cve.report/CVE-2026-20276","api":"https://cve.report/api/cve/CVE-2026-20276.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-20276","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-20276"},"summary":{"title":"Cisco IOS XR Software Security Hardening Release: September 2026","description":"As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-20276 are related to insufficient control flow management issues that are grouped under the Common Weakness Enumeration (CWE) CWE-691.","state":"PUBLISHED","assigner":"cisco","published_at":"2026-09-02 17:17:32","updated_at":"2026-09-18 13:17:28"},"problem_types":["CWE-691","CWE-691 Insufficient Control Flow 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This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-20276 are related to insufficient control flow management issues that are grouped under the Common Weakness Enumeration (CWE) CWE-691."}],"exploits":[{"lang":"en","value":"The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","version":"3.1"},"format":"cvssV3_1"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-691","description":"Insufficient Control Flow 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eYear":"2026","CveId":"20276","Ordinal":"1","Title":"Cisco IOS XR Software Security Hardening Release: September 2026","CVE":"CVE-2026-20276","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"20276","Ordinal":"1","NoteData":"As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities.\r\n\r\nThe vulnerabilities tracked by CVE-2026-20276 are related to insufficient control flow management issues that are grouped under the Common Weakness Enumeration (CWE) CWE-691.","Type":"Description","Title":"Cisco IOS XR Software Security Hardening Release: September 2026"}]}}}