CVE-2026-80303

Published 6 November 2026 · tracked since 7 November 2026

Description

An integer underflow vulnerability in the Avast Windows Filtering Platform (WFP) stream parser on Windows allows denial of service by causing a system crash. The WFP callout driver processes network stream data and computes length values for packet fragment reassembly. The length calculation does

References

• NVD — National Vulnerability Database
• CVE.org record (MITRE)
• CISA Known Exploited Vulnerabilities catalog

Latest tracked vulnerabilities

• CVE-2026-124463 HIGH 8.7
• CVE-2026-124461 HIGH 8.1
• CVE-2026-124459 HIGH 8.1
• CVE-2026-124457 HIGH 7.6
• CVE-2026-124456 HIGH 7.1
• CVE-2026-124453 HIGH 7.1
• CVE-2026-124452 MEDIUM 5.4
• CVE-2026-124451 MEDIUM 5.3
• CVE-2026-124450 CRITICAL 9.9
• CVE-2026-124446 HIGH 8.8

→ Open the live CVE board · all tools