CVE-2026-70351: Microsoft WebP Image Extension

High severity, CVSS 8.8. EPSS: 0.8% chance of exploitation in the next 30 days.

Integer overflow or wraparound in Microsoft WebP Image Extension allows an unauthorized attacker to execute code over a network.

Affected products

• Microsoft WebP Image Extension: before 1.2.31.0 (fixed in 1.2.31.0)

Published 2026-09-08. Last modified 2026-09-29.