CVE-2026-35568 | modelcontextprotocol java-sdk up to 0.x Model Context Protocol origin validation

VDB-355962 · CVE-2026-35568 · GCVE-0-2026-35568 MODELCONTEXTPROTOCOL JAVA-SDK UP TO 0.X MODEL CONTEXT PROTOCOL ORIGIN VALIDATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.0 $0-$5k 2.54 Summaryinfo A vulnerability described as critical has been identified in modelcontextprotocol java-sdk up to 0.x. This affects an unknown part of the component Model Context Protocol. The manipulation results in origin validation. This vulnerability is reported as CVE-2026-35568. The attack can be launched remotely. No exploit exists. Upgrading the affected component is recommended. Detailsinfo A vulnerability, which was classified as critical, was found in modelcontextprotocol java-sdk up to 0.x. Affected is an unknown code block of the component Model Context Protocol. The manipulation with an unknown input leads to a origin validation vulnerability. CWE is classifying the issue as CWE-346. The product does not properly verify that the source of data or communication is valid. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes: MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to 1.0.0, the java-sdk contains a DNS rebinding vulnerability. This vulnerability allows an attacker to access a locally or network-private java-sdk MCP server via a victims browser that is either local, or network adjacent. This allows an attacker to make any tool call to the server as if they were a locally running MCP connected AI agent. This vulnerability is fixed in 1.0.0. The advisory is available at github.com. This vulnerability is traded as CVE-2026-35568 since 04/03/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. Upgrading to version 1.0.0 eliminates this vulnerability. Productinfo Type Programming Language Software Vendor modelcontextprotocol Name java-sdk Version 0.x Website Product: https://github.com/modelcontextprotocol/java-sdk/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 7.3 VulDB Meta Temp Score: 7.0 VulDB Base Score: 7.3 VulDB Temp Score: 7.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Origin validation CWE: CWE-346 / CWE-345 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: java-sdk 1.0.0 Timelineinfo 04/03/2026 CVE reserved 04/07/2026 +4 days Advisory disclosed 04/07/2026 +0 days VulDB entry created 04/07/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-35568 (🔒) GCVE (CVE): GCVE-0-2026-35568 GCVE (VulDB): GCVE-100-355962 Entryinfo Created: 04/07/2026 23:36 Changes: 04/07/2026 23:36 (67) Complete: 🔍 Cache ID: 99:01C:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸