CVE-2022-21653: Typelevel Jawn

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

Jawn is an open source JSON parser. Extenders of the `org.typelevel.jawn.SimpleFacade` and `org.typelevel.jawn.MutableFacade` who don't override `objectContext()` are vulnerable to a hash collision attack which may result in a denial of service. Most applications do not implement these traits directly, but inherit from a library. `jawn-parser-1.3.1` fixes this issue and users are advised to upgrade. For users unable to upgrade override `objectContext()` to use a collision-safe collection.

Affected products

• Typelevel Jawn: before 1.3.2 (fixed in 1.3.2)

Published 2022-01-05. Last modified 2026-06-17.