CVE-2025-10101Avast antivirus heap buffer OOB read when scanning a malformed Mach-O file
Updated under an hour ago ()
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It affects Gen Digital Avast Antivirus and 4 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-125
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- NLOK
- NVD analysis
- Deferred
- Record last updated
- Jun 12, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Gen Digital Avast Antivirus gen_digital:avast_antivirus (from the name) | before 25090300 | CNA record |
Gen Digital AVG Antivirus gen_digital:avg_antivirus (from the name) | before 25090300 | CNA record |
Gen Digital Norton Antivirus gen_digital:norton_antivirus (from the name) | before 25090300 | CNA record |
Gen Digital Avast One gen_digital:avast_one (from the name) | before 25090300 | CNA record |
Gen Digital Avast Business Antivirus gen_digital:avast_business_antivirus (from the name) | before 25090300 | CNA record |
References
- https://www.gendigital.com/us/en/contact-us/security-advisories/
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.