Is io.modelcontextprotocol.sdk:mcp-core affected by CVE-2026-34237?

Maven io.modelcontextprotocol.sdk:mcp-core is affected in >=1.0.0 =1.1.0 <1.1.1, <0.18.3.

Is CVE-2026-34237 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

medium

CVE-2026-34237

Q: Is CVE-2026-34237 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

Maven · io.modelcontextprotocol.sdk:mcp-core

Summary

MCP Java SDK has a Hardcoded Wildcard CORS (Access-Control-Allow-Origin: *)

Severity: medium
EPSS: 0.2% (p13)
Also known as: GHSA-hv2w-8mjj-jw22
Published: 2026-03-30

References

https://github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-hv2w-8mjj-jw22
https://nvd.nist.gov/vuln/detail/CVE-2026-34237
https://cheatsheetseries.owasp.org/cheatsheets/HTTP_Headers_Cheat_Sheet.html#access-control-allow-origin

Related advisories

CVE-2026-35568 — high · Maven/io.modelcontextprotocol.sdk:mcp-core

Is your project exposed to this? Stateward checks every dependency on every pull request and flags it only if your code actually reaches it.

Check my repo

Summarize with AI

ChatGPT Claude Perplexity

Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.