CVE-2026-6676highCWE-787

CVE-2026-6676: high-severity vulnerability in Gen Digital Avira Antivirus

Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive

Published · Updated

Follow this CVE+ Monitor Avira Antivirus

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.8epss 0.1%
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.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products
Gen Digital · Avira Antivirus
Related CVEs — Gen Digital Avira Antivirus

In the same product, most dangerous first.

CVE-2025-8351HIGHAvira antivirus engine heap buffer OOB read when scanning a malformed fileEPSS 0.2%CVE-2025-7017HIGHAvira antivirus engine heap buffer OOB read when scanning a malformed Windows MSI fileEPSS 0.1%CVE-2025-7003HIGHAvira antivirus engine heap buffer OOB read when scanning a malformed PDF file (variant 1)EPSS 0.1%CVE-2025-7002HIGHAvira antivirus engine heap buffer OOB read when scanning a malformed PDF file (variant 2)EPSS 0.1%CVE-2025-14098HIGHAvira antivirus engine heap buffer OOB write when scanning a malformed MS-DOS executable fileEPSS 0.1%CVE-2025-9033HIGHAvira antivirus engine heap buffer OOB read when scanning a malformed PDF file (variant 3)EPSS 0.1%