CVE-2026-34237

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-34237
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34237.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-34237
Aliases
Downstream
CGA (8)
Published
2026-03-31T15:40:01Z
Modified
2026-10-21T02:30:58Z
Severity
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
Summary
MCP Java SDK has a Hardcoded Wildcard CORS (Access-Control-Allow-Origin: *)
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-942"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34237.json"
}
References

Affected packages

Git / github.com/modelcontextprotocol/java-sdk

Affected ranges

Type
GIT
Repo
https://github.com/modelcontextprotocol/java-sdk
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
d187d09dd58ae9349380a57a23c3636dd78e29e1
Introduced
d4d8072693a8ad98f6d9731dfd4cdbb307fa9bf1
Last Affected
d4d8072693a8ad98f6d9731dfd4cdbb307fa9bf1
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:lfprojects:mcp_java_sdk:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.0.1"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:lfprojects:mcp_java_sdk:1.1.0:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "1.1.0"
                },
                {
                    "last_affected":  "1.1.0"
                }
            ],
            "source":  "CPE_STRING"
        }
    ]
}

Affected versions

1.*
1.1.0
v0.*
v0.1.0
v0.3.0
v0.3.1
v0.4.0
v0.4.1
v0.4.2
v0.5.0
v0.6.0
v1.*
v1.0.0
v1.1.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34237.json"