URL Validation Vulnerability Found in Java-json-tools Jackson-coreutils by Java-json-tools
CVE-2026-86321

6.9MEDIUM

Key Information:

Vendor: Java-json-tools
Status: Jackson-coreutils
Vendor: CVE Published:; 7 September 2026

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👾 Exploit Exists🟡 Public PoC

What is CVE-2026-86321?

A vulnerability has been identified in the URL Validation functionality of the java-json-tools jackson-coreutils library, specifically within the 'JsonLoader.fromURL' method. This flaw could allow an attacker to perform server-side request forgery (SSRF), which enables the attacker to exploit the server to send unauthorized requests to internal resources. The vulnerability is publicly known and was reported to the maintainers, but there has been no response regarding a fix. Users of the affected version 2.0 are advised to review their dependency management practices and monitor for updates from the vendor.

Affected Version(s)

jackson-coreutils 2.0

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-2026-86321 - Proof of Concept