CVE-2026-6676

HIGH

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

Title source: cna

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.

References (1)

Core 1

Core References

https://www.gendigital.com/us/en/contact-us/security-advisories/

Scores

CVSS v3 7.8

EPSS 0.0012

EPSS Percentile 2.3%

Attack Vector LOCAL

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-787

Status published

Products (1)

Gen Digital/Avira Antivirus < 8.3.27.12

Published Jun 12, 2026

Tracked Since Jun 13, 2026