CVE-2013-6401: Jansson Project Jansson

Medium severity, CVSS 5.0. EPSS: 2% chance of exploitation in the next 30 days.

Jansson, possibly 2.4 and earlier, does not restrict the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via a crafted JSON document.

Affected products

• Jansson Project Jansson: up to and including 2.4; version 2.0 only; version 2.0.1 only; version 2.1 only; version 2.2 only; version 2.2.1 only; …

Published 2014-03-21. Last modified 2026-06-17.