High [CVE-2026-50193] Denial of Service via deeply nested JSON processing

jackson-databind contains the general-purpose data-binding functionality and tree-model for Jackson Data Processor.

From 2.13.0 until 2.14.0, a potential Denial-of-Service exists when attacker sends deeply nested JSON if (and only if) the service reads deeply nested (1000s of levels) JSON as JsonNode (ObjectMapper.readTree()) and writes out same (or modifided) node using JsonNode.toString().

This can consume significant amount of resources with concurrent relatively small requests (1000 nested arrays is 2kB). This vulnerability is fixed in 2.14.0.

A remote attacker can exploit this vulnerability by sending deeply nested JSON (JavaScript Object Notation) data to a service that reads and processes it. This can lead to a Denial of Service (DoS) by consuming significant system resources, making the service unavailable to legitimate users.

This is an Important denial-of-service flaw in jackson-databind, affecting services that process deeply nested JSON data. Exploitation occurs when a service reads JSON as `JsonNode` and subsequently writes it back using `JsonNode.toString()`, leading to excessive resource consumption and potential service unavailability.

Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-1050.