CVE-2026-6676

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

Published Jun 12, 2026 CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Solution

Upgrade to Avira scan engine build 8.3.27.12 or any later engine release. Builds at or above 8.3.27.12 include the fix.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Gen Digital
Gen Digital avira Antivirus
Vendors & Products Gen Digital
Gen Digital avira Antivirus
Type Values Removed Values Added
Description 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.
Title Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive
Weaknesses CWE-787
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GEN
Published
Updated
Jun 15, 2026, 6:01 PM
Reserved
Apr 20, 2026, 2:46 PM
Status
Deferred
Published
Jun 12, 2026, 11:16 PM
Modified
Jul 23, 2026, 9:10 AM