CVE-2026-84851: Amazon Ion-C

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

An uncontrolled recursion issue exists in Amazon Ion-C versions before 1.1.6 that might allow a remote unauthenticated actor to craft Ion data that exhausts the native call stack and crashes the application using the library, resulting in a denial of service.

Affected products

• Amazon Ion-C: before 1.1.6 (fixed in 1.1.6)

Published 2026-09-03. Last modified 2026-09-03.