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Vulnerabilities

Vulnerability · CVE-2026-34237

MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients.

Published Mar 31, 2026 · catalog updated Jul 24, 2026 · mcp java sdk

Check if you run it

No confirmed exploitation is on record for CVE-2026-34237. EPSS is 0.31%. Act only if a listed version of mcp java sdk is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.31%
Remediation
Advisory link
Affected products
cpe lfprojects/mcp java sdk

MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to versions 0.83.0, 1.0.1, and 1.1.1, there is a hardcoded wildcard CORS vulnerability. This issue has been patched in versions 0.83.0, 1.0.1, and 1.1.1.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe lfprojects/mcp java sdk1.1.0

How to fix CVE-2026-34237

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-34237. EPSS is 0.31%. Act only if a listed version of mcp java sdk is installed.

Which versions are affected?

Compare what you have installed with lfprojects/mcp java sdk 1.1.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-942: Permissive Cross-domain Policy with Untrusted Domains. EPSS 0.31%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 31, 2026 · NIST NVD

    Detected

    MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to versions 0.83.0, 1.0.1, and 1.1.1, there is a hardcoded wildcard CORS vulnerability. This issue has been patched in versions 0.83.0, 1.0.1, and 1.1.1.

  2. Jul 24, 2026 · NIST NVD

    Updated

    MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to versions 0.83.0, 1.0.1, and 1.1.1, there is a hardcoded wildcard CORS vulnerability. This issue has been patched in versions 0.83.0, 1.0.1, and 1.1.1.

Sources

  • CVE.orgVulnerability recordCVE-2026-34237

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-34237

    30-day exploitation probability 0.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-34237

    MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to versions 0.83.0, 1.0.1, and 1.1.1, there is a hardcoded wildcard CORS vulnerability. This issue has been patched in versions 0.83.0, 1.0.1, and 1.1.1.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.