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CVE-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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d08eef12da25a166a0c5cf5b3ce76c83fc1ff7b8e61b68e7a135de5ac9dfd93a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"java-sdk","vendor":"modelcontextprotocol","versions":[{"status":"affected","version":">= 1.0.0, < 1.0.1"},{"status":"affected","version":">= 1.1.0, < 1.1.1"},{"status":"affected","version":"< 0.18.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1ee5e9c58179413f57a7b4b7512ea815ead2e5726066d21b90a1d459bf1f52ec · sha256:0488575445148146… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1ee5e9c58179413f57a7b4b7512ea815ead2e5726066d21b90a1d459bf1f52ec · sha256:0488575445148146… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-942","description":"CWE-942: Permissive Cross-domain Policy with Untrusted Domains","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1ee5e9c58179413f57a7b4b7512ea815ead2e5726066d21b90a1d459bf1f52ec · sha256:0488575445148146… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletSseServerTransportProvider.java#L289","tags":["x_refsource_MISC"],"url":"https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletSseServerTransportProvider.java#L289"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1ee5e9c58179413f57a7b4b7512ea815ead2e5726066d21b90a1d459bf1f52ec · sha256:0488575445148146… · /containers/cna/references/1
{"name":"https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletStreamableServerTransportProvider.java#L525","tags":["x_refsource_MISC"],"url":"https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletStreamableServerTransportProvider.java#L525"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1ee5e9c58179413f57a7b4b7512ea815ead2e5726066d21b90a1d459bf1f52ec · sha256:0488575445148146… · /containers/cna/references/2
{"name":"https://github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-hv2w-8mjj-jw22","tags":["x_refsource_CONFIRM"],"url":"https://github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-hv2w-8mjj-jw22"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1ee5e9c58179413f57a7b4b7512ea815ead2e5726066d21b90a1d459bf1f52ec · sha256:0488575445148146… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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