cve.bz

CVE-2026-34237

6.1 mediumEPSS 0.2%

Medium (6.1) in lfprojects mcp java sdk. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in io.modelcontextprotocol.sdk:mcp-core 0.18.3, 1.0.1, 1.1.1.

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.

Severity

CVSS 3.1

6.1 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
0.2% chance of exploitation in the next 30 days; higher than 14% of CVEs (scores of 2026-10-31)
CWE
CWE-942
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-hv2w-8mjj-jw22Mavenio.modelcontextprotocol.sdk:mcp-core>=1.0.0 <1.0.11.0.1
GHSA-hv2w-8mjj-jw22Mavenio.modelcontextprotocol.sdk:mcp-core>=1.1.0 <1.1.11.1.1
GHSA-hv2w-8mjj-jw22Mavenio.modelcontextprotocol.sdk:mcp-core<0.18.30.18.3

References

Check your stackJSON