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6 vulnerabilities found for go-sdk by modelcontextprotocol
CVE-2026-34742 (GCVE-0-2026-34742)
Vulnerability from nvd – Published: 2026-04-02 18:32 – Updated: 2026-04-03 15:59
VLAI
Title
Model Context Protocol Go SDK: DNS Rebinding Protection Disabled by Default for Servers Running on Localhost
Summary
The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.0, the Model Context Protocol (MCP) Go SDK does not enable DNS rebinding protection by default for HTTP-based servers. When an HTTP-based MCP server is run on localhost without authentication with StreamableHTTPHandler or SSEHandler, a malicious website could exploit DNS rebinding to bypass same-origin policy restrictions and send requests to the local MCP server. This could allow an attacker to invoke tools or access resources exposed by the MCP server on behalf of the user in those limited circumstances. This issue has been patched in version 1.4.0.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-1188 - Insecure Default Initialization of Resource
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/modelcontextprotocol/go-sdk/se… | x_refsource_CONFIRM |
| https://github.com/modelcontextprotocol/go-sdk/pull/760 | x_refsource_MISC |
| https://github.com/modelcontextprotocol/go-sdk/co… | x_refsource_MISC |
| https://github.com/modelcontextprotocol/go-sdk/re… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| modelcontextprotocol | go-sdk |
Affected:
< 1.4.0
|
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CVE-2026-33252 (GCVE-0-2026-33252)
Vulnerability from nvd – Published: 2026-03-23 23:44 – Updated: 2026-03-24 18:39
VLAI
Title
MCP Go SDK Allows Cross-Site Tool Execution for HTTP Servers without Authorizatrion
Summary
The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.1, the Go SDK's Streamable HTTP transport accepted browser-generated cross-site `POST` requests without validating the `Origin` header and without requiring `Content-Type: application/json`. In deployments without Authorization, especially stateless or sessionless configurations, this allows an arbitrary website to send MCP requests to a local server and potentially trigger tool execution. Version 1.4.1 contains a patch for the issue.
Severity
7.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-352 - Cross-Site Request Forgery (CSRF)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/modelcontextprotocol/go-sdk/se… | x_refsource_CONFIRM |
| https://github.com/modelcontextprotocol/go-sdk/co… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| modelcontextprotocol | go-sdk |
Affected:
< 1.4.1
|
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CVE-2026-27896 (GCVE-0-2026-27896)
Vulnerability from nvd – Published: 2026-02-26 00:47 – Updated: 2026-02-26 17:06
VLAI
Title
MCP Go SDK Vulnerable to Improper Handling of Case Sensitivity
Summary
The Go MCP SDK used Go's standard encoding/json.Unmarshal for JSON-RPC and MCP protocol message parsing in versions prior to 1.3.1. Go's standard library performs case-insensitive matching of JSON keys to struct field tags — a field tagged json:"method" would also match "Method", "METHOD", etc. This violated the JSON-RPC 2.0 specification, which defines exact field names. A malicious MCP peer may have been able to send protocol messages with non-standard field casing that the SDK would silently accept. This had the potential for bypassing intermediary inspection and coss-implementation inconsistency. Go's standard JSON unmarshaling was replaced with a case-sensitive decoder in commit 7b8d81c. Users are advised to update to v1.3.1 to resolve this issue.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/modelcontextprotocol/go-sdk/se… | x_refsource_CONFIRM |
| https://github.com/modelcontextprotocol/go-sdk/co… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| modelcontextprotocol | go-sdk |
Affected:
< 1.3.1
|
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CVE-2026-34742 (GCVE-0-2026-34742)
Vulnerability from cvelistv5 – Published: 2026-04-02 18:32 – Updated: 2026-04-03 15:59
VLAI
Title
Model Context Protocol Go SDK: DNS Rebinding Protection Disabled by Default for Servers Running on Localhost
Summary
The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.0, the Model Context Protocol (MCP) Go SDK does not enable DNS rebinding protection by default for HTTP-based servers. When an HTTP-based MCP server is run on localhost without authentication with StreamableHTTPHandler or SSEHandler, a malicious website could exploit DNS rebinding to bypass same-origin policy restrictions and send requests to the local MCP server. This could allow an attacker to invoke tools or access resources exposed by the MCP server on behalf of the user in those limited circumstances. This issue has been patched in version 1.4.0.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-1188 - Insecure Default Initialization of Resource
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/modelcontextprotocol/go-sdk/se… | x_refsource_CONFIRM |
| https://github.com/modelcontextprotocol/go-sdk/pull/760 | x_refsource_MISC |
| https://github.com/modelcontextprotocol/go-sdk/co… | x_refsource_MISC |
| https://github.com/modelcontextprotocol/go-sdk/re… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| modelcontextprotocol | go-sdk |
Affected:
< 1.4.0
|
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CVE-2026-33252 (GCVE-0-2026-33252)
Vulnerability from cvelistv5 – Published: 2026-03-23 23:44 – Updated: 2026-03-24 18:39
VLAI
Title
MCP Go SDK Allows Cross-Site Tool Execution for HTTP Servers without Authorizatrion
Summary
The Go MCP SDK used Go's standard encoding/json. Prior to version 1.4.1, the Go SDK's Streamable HTTP transport accepted browser-generated cross-site `POST` requests without validating the `Origin` header and without requiring `Content-Type: application/json`. In deployments without Authorization, especially stateless or sessionless configurations, this allows an arbitrary website to send MCP requests to a local server and potentially trigger tool execution. Version 1.4.1 contains a patch for the issue.
Severity
7.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-352 - Cross-Site Request Forgery (CSRF)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/modelcontextprotocol/go-sdk/se… | x_refsource_CONFIRM |
| https://github.com/modelcontextprotocol/go-sdk/co… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| modelcontextprotocol | go-sdk |
Affected:
< 1.4.1
|
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CVE-2026-27896 (GCVE-0-2026-27896)
Vulnerability from cvelistv5 – Published: 2026-02-26 00:47 – Updated: 2026-02-26 17:06
VLAI
Title
MCP Go SDK Vulnerable to Improper Handling of Case Sensitivity
Summary
The Go MCP SDK used Go's standard encoding/json.Unmarshal for JSON-RPC and MCP protocol message parsing in versions prior to 1.3.1. Go's standard library performs case-insensitive matching of JSON keys to struct field tags — a field tagged json:"method" would also match "Method", "METHOD", etc. This violated the JSON-RPC 2.0 specification, which defines exact field names. A malicious MCP peer may have been able to send protocol messages with non-standard field casing that the SDK would silently accept. This had the potential for bypassing intermediary inspection and coss-implementation inconsistency. Go's standard JSON unmarshaling was replaced with a case-sensitive decoder in commit 7b8d81c. Users are advised to update to v1.3.1 to resolve this issue.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/modelcontextprotocol/go-sdk/se… | x_refsource_CONFIRM |
| https://github.com/modelcontextprotocol/go-sdk/co… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| modelcontextprotocol | go-sdk |
Affected:
< 1.3.1
|
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