{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-6676: Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-6676","status":"final","version":"1","initial_release_date":"2026-06-12T22:16:27.745Z","current_release_date":"2026-06-12T22:16:27.745Z","revision_history":[{"date":"2026-06-12T22:16:27.745Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Heap buffer out-of-bounds write vulnerability in Avira Antivirus engine when scanning a malformed POSIX tar archive may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.\n\nThis issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.27.12.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-6676 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-6676"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-6676"},{"category":"external","summary":"gendigital.com","url":"https://www.gendigital.com/us/en/contact-us/security-advisories/"}]},"product_tree":{"branches":[{"category":"vendor","name":"Gen Digital","branches":[{"category":"product_name","name":"Avira Antivirus","branches":[{"category":"product_version_range","name":"<8.3.27.12","product":{"name":"Gen Digital Avira Antivirus <8.3.27.12","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:gen_digital:avira_antivirus:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-6676","title":"Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive","notes":[{"category":"description","text":"Heap buffer out-of-bounds write vulnerability in Avira Antivirus engine when scanning a malformed POSIX tar archive may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.\n\nThis issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.27.12.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 8.3.27.12.","product_ids":["CSAFPID-1"]}]}]}