Avast antivirus heap OOB when scanning a malformed zip file
CVE-2025-7011

7.8HIGH

Key Information:

Vendor

Gen Digital

Status
Avast Antivirus
Avg Antivirus
Norton Antivirus
Avast One
Vendor
CVE Published:
12 June 2026

What is CVE-2025-7011?

Heap out-of-bounds read vulnerability in Avast Antivirus when scanning a malformed zip file containing XML may allow Local Execution of Code or Denial-of-Service of the antivirus process.

This issue affects Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus on Windows, macOS, and Linux for virus definition builds from 25020100 before 25021208.

The affected scanning logic is delivered through a shared Gen Digital virus definition update stream. The same stream feeds the consumer antivirus products listed in this advisory and other Gen Digital products that embed the same engine. Mitigation flows through this update channel; installations at or above the listed build are not vulnerable regardless of which product consumes the stream.

Affected Version(s)

Avast Antivirus Windows 25020100

Avast Business Antivirus Windows 25020100

Avast One Windows 25020100

References

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

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Mike Zhang, an independent security researcher
.