Medium severity6.1NVD Advisory· Published Mar 31, 2026· Updated Jun 9, 2026
CVE-2026-34237
CVE-2026-34237
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
io.modelcontextprotocol.sdk:mcp-coreMaven | >= 1.0.0, < 1.0.1 | 1.0.1 |
io.modelcontextprotocol.sdk:mcp-coreMaven | >= 1.1.0, < 1.1.1 | 1.1.1 |
io.modelcontextprotocol.sdk:mcp-coreMaven | < 0.18.3 | 0.18.3 |
Affected products
7cpe:2.3:a:lfprojects:mcp_java_sdk:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:lfprojects:mcp_java_sdk:*:*:*:*:*:*:*:*range: <1.0.1
- cpe:2.3:a:lfprojects:mcp_java_sdk:1.1.0:*:*:*:*:*:*:*
- osv-coords5 versionspkg:apk/chainguard/camunda-8.9pkg:apk/chainguard/camunda-zeebe-8.9pkg:apk/chainguard/nacospkg:apk/chainguard/nacos-dockerpkg:maven/io.modelcontextprotocol.sdk/mcp-core
< 8.9.1-r0+ 4 more
- (no CPE)range: < 8.9.1-r0
- (no CPE)range: < 8.9.1-r0
- (no CPE)range: < 3.2.0-r6
- (no CPE)range: < 3.2.0-r2
- (no CPE)range: < 1.0.1
Patches
Vulnerability mechanics
References
6- github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletSseServerTransportProvider.javanvdPatchWEB
- github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletStreamableServerTransportProvider.javanvdPatchWEB
- github.com/advisories/GHSA-hv2w-8mjj-jw22ghsaADVISORY
- github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-hv2w-8mjj-jw22nvdMitigationVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-34237ghsaADVISORY
- cheatsheetseries.owasp.org/cheatsheets/HTTP_Headers_Cheat_Sheet.htmlghsaWEB
News mentions
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