Avast antivirus stack overflow when scanning a malformed PDF file
Published Jun 12, 2026
5.5
MEDIUMCVSS 3.1
EPSS 0.11%
Description
Stack overflow vulnerability due to uncontrolled recursion in Avast Antivirus when scanning a malformed PDF file may allow 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 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 products
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- Version 0StatusaffectedConstraints<25021208
- Version
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- Version 0StatusaffectedConstraints<25021208
- Version
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- Version 0StatusaffectedConstraints<25021208
- Version
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- Version 0StatusaffectedConstraints<25021208
- Version
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- Version 0StatusaffectedConstraints<25021208
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Gen Digital | AVG Antivirus | affected |
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| Gen Digital | Avast Antivirus | affected |
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| Gen Digital | Avast Business Antivirus | affected |
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| Gen Digital | Avast One | affected |
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| Gen Digital | Norton Antivirus | affected |
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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 25021208 or any later virus-definition update. All builds at or above VPS 25021208 include the fix; staying current on definitions is required.
References (1)
Change history (0)
No recorded changes yet.