CVE-2026-6676CWE-787

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

High · published June 12, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
7.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00180 · 7.1th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-06-12T22:16Z
EPSS history
Timeline
  • 12 JUN 22:16Z
    Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive
    cvelistv5