Avast antivirus heap buffer OOB read when scanning a malformed Mach-O file

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Summary

CVECVE-2025-10101
StatePUBLISHED
AssignerNLOK
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-01 16:15:50 UTC
Updated2026-06-12 23:16:26 UTC
DescriptionHeap buffer out-of-bounds read vulnerability in Avast Antivirus when scanning a malformed Mach-O 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 25090300. 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

EPSS: 0.000140000 probability, percentile 0.024570000 (date 2026-06-12)

Problem Types: CWE-125 | CWE-125 CWE-125 Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNACVSS7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gen Digital Avast Antivirus affected 25090300 custom Windows, macOS, Linux
CNA Gen Digital AVG Antivirus affected 25090300 custom Windows, macOS, Linux
CNA Gen Digital Norton Antivirus affected 25090300 custom Windows, macOS, Linux
CNA Gen Digital Avast One affected 25090300 custom Windows, macOS, Linux
CNA Gen Digital Avast Business Antivirus affected 25090300 custom Windows, macOS, Linux

References

ReferenceSourceLinkTags
www.gendigital.com/us/en/contact-us/security-advisories [email protected] www.gendigital.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Mike Zhang, an independent security researcher (en)

Additional Advisory Data

Solutions

CNA: Install virus definitions VPS 25090300 or any later virus-definition update. All builds at or above VPS 25090300 include the fix; staying current on definitions is required.

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