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Description

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.

PUBLISHED Reserved 2025-07-02 | Published 2026-06-12 | Updated 2026-06-15 | Assigner GEN




HIGH: 7.8CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Problem types

CWE-125 Out-of-bounds Read

Product status

Default status
affected

25020100 (custom) before 25021208
affected

Default status
affected

25020100 (custom) before 25021208
affected

Default status
affected

25020100 (custom) before 25021208
affected

Default status
affected

25020100 (custom) before 25021208
affected

Default status
affected

25020100 (custom) before 25021208
affected

Credits

Mike Zhang, an independent security researcher reporter

References

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

cve.org (CVE-2025-7011)

nvd.nist.gov (CVE-2025-7011)

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