CVE-2026-6676 HIGH

CVE-2026-6676: Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive

Vendor Gen Digital
Product Avira Antivirus
Weakness CWE-787
Published June 12, 2026
Last update June 15, 2026
View on NVD All CVEs

CVSS base score

7.8/10
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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. This issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.27.12.

Key dates

02Disclosure timeline

June 12, 2026 CVE published
June 15, 2026 Record updated