CVE-2026-34237

6.1 MEDIUM

Published: March 31, 2026 Modified: April 03, 2026

Description

MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to versions 1.0.1 and 1.1.1, there is a hardcoded wildcard CORS vulnerability. This issue has been patched in versions 1.0.1 and 1.1.1.

AI Explanation

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletSseServerTransportProvider.java#L289

Source: security-advisories@github.com

Patch

https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletStreamableServerTransportProvider.java#L525

Source: security-advisories@github.com

Patch

https://github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-hv2w-8mjj-jw22

Source: security-advisories@github.com

Mitigation Vendor Advisory

3 reference(s) from NVD

Quick Stats

CVSS v3 Score

6.1 / 10.0

EPSS (Exploit Probability)

0.0%

10th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-942

Affected Vendors

lfprojects

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