Avast antivirus heap buffer OOB write when scanning a malformed PE file
Published Jun 12, 2026
7.8
HIGHCVSS 3.1
EPSS 0.15%
Description
Heap buffer out-of-bounds write vulnerability in Avast Antivirus when scanning a malformed Windows PE file 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 before VPS 25040308.
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 products
-
Affected
- ≥ 0, < 25040308
-
Affected
- ≥ 0, < 25040308
-
Affected
- ≥ 0, < 25040308
-
Affected
- ≥ 0, < 25040308
-
Affected
- ≥ 0, < 25040308
Default status is the baseline for the product. Each version can override it (patched versions can be marked unaffected).
| Vendor | Product | Default status | Versions |
|---|---|---|---|
| Gen Digital | AVG Antivirus | affected | Affected
|
| Gen Digital | Avast Antivirus | affected | Affected
|
| Gen Digital | Avast Business Antivirus | affected | Affected
|
| Gen Digital | Avast One | affected | Affected
|
| Gen Digital | Norton Antivirus | affected | Affected
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Vendor solution
Install virus definitions VPS 25040308 or any later virus-definition update. All builds at or above VPS 25040308 include the fix; staying current on definitions is required.
References (2)
Change history (0)
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CVE.org / MITRE
CISA Vulnrichment
Red Hat
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GitHub
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