Avast Antivirus up to 2.0.4400 on macOS Mach-o File Parser heap-based overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in Avast Antivirus on macOS. Impacted is an unknown function of the component Mach-o File Parser. The manipulation results in heap-based overflow. This vulnerability was named CVE-2025-10101. The attack needs to be approached locally. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Avast Antivirus on macOS. It has been classified as critical. Affected is some unknown functionality of the component Mach-o File Parser. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Heap 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.

The advisory is shared for download at gendigital.com. This vulnerability is traded as CVE-2025-10101 since 09/08/2025. The exploitability is told to be difficult. The attack needs to be approached locally. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/13/2026).

Upgrading to version 3.9.2025 eliminates this vulnerability.

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Productinfo

Type

• Anti-Malware Software

Vendor

• Avast

Name

• Antivirus

Version

• 1.0.5
• 1.0.5-1
• 1.0.8
• 2.0.3587
• 2.0.4400

License

• free

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CPE 2.2info

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