CVE-2026-86318: Java-JSON-Tools JSON-Patch

Medium severity, CVSS 5.3. EPSS: 0.8% chance of exploitation in the next 30 days.

A flaw has been found in java-json-tools json-patch up to 1.13. Affected is the function JsonMergePatch.fromJson of the file JsonMergePatchDeserializer.java. Executing a manipulation can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

Affected products

• Java-JSON-Tools JSON-Patch: version 1.0 only; version 1.1 only; version 1.2 only; version 1.3 only; version 1.4 only; version 1.5 only; …

Published 2026-09-07. Last modified 2026-09-08.