Stack-based Buffer Overflow in Java-JSON-Tools Affects Multiple Versions
CVE-2026-86318

6.9MEDIUM

Key Information:

Vendor: Java-json-tools
Status: Json-patch
Vendor: CVE Published:; 7 September 2026

🔔 Create Java-json-tools Vulnerability Alert

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👾 Exploit Exists🟡 Public PoC

What is CVE-2026-86318?

A vulnerability exists in the json-patch component of java-json-tools up to version 1.13, specifically in the JsonMergePatch.fromJson function located in JsonMergePatchDeserializer.java. This flaw can lead to a stack-based buffer overflow, which may be exploited remotely, allowing an attacker to manipulate JSON patch data. Despite the early notification to the project maintainers, no official response has been documented, increasing the urgency for users to assess their exposure and take necessary precautions.

Affected Version(s)

json-patch 1.0

json-patch 1.1

json-patch 1.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-86318 - Proof of Concept