{"items":[{"id":"NVI-00016360","kind":"vulnerability","title":"DNS Rebinding Protection Disabled by Default in Model Context Protocol Go SDK for Servers Running on Localhost","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-xw59-hvm2-8pj6","CVE-2026-34742"],"plain_summary":"GitHub lists this reviewed advisory for github.com/modelcontextprotocol/go-sdk. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-48b8e942722838d6ff76a020375488e6"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-07-21T14:58:59.000Z","value":"8.1 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-6ab2640eb29f0736c1ed73ca997a6576"},{"kind":"CVSS","as_of":"2026-07-24T21:10:00.143Z","value":"8.1 HIGH (3.1)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-48b8e942722838d6ff76a020375488e6"},{"kind":"CVSS","as_of":"2026-07-24T21:10:00.143Z","value":"8 HIGH (3.1)","meaning":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c severity; no combined Null risk score.","source_id":"sr-48b8e942722838d6ff76a020375488e6"},{"kind":"CVSS","as_of":"2026-07-24T21:10:00.143Z","value":"7.6 HIGH (4.0)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-48b8e942722838d6ff76a020375488e6"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-6ab2640eb29f0736c1ed73ca997a6576","url":"https://github.com/advisories/GHSA-xw59-hvm2-8pj6","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-xw59-hvm2-8pj6","publisher":"GitHub Advisory Database","observed_at":"2026-11-03T22:34:49.300Z"},{"id":"sr-48b8e942722838d6ff76a020375488e6","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34742","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-34742","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-07T13:58:13.921Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-6ab2640eb29f0736c1ed73ca997a6576"],"technology":"github.com/modelcontextprotocol/go-sdk","known_exclusions":[],"conditions_summary":"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.\n\nNote that running HTTP-based MCP servers locally without authentication is not recommended per MCP security best practices. This issue does not affect servers using stdio transport.\n\nServers created via `StreamableHTTPHandler` or `SSEHandler` now have this protection enabled by default when binding to `localhost`. Users are advised to update to version `1.4.0` to receive this automatic protection.","public_affected_ranges":["< 1.4.0"]}],"null_published_at":"2026-11-07T18:43:12.108Z","source_updated_at":"2026-07-21T14:58:59.000Z","source_disclosed_at":"2026-04-01T21:09:09.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-11-03T22:34:49.300Z"},{"id":"NVI-00016360","kind":"vulnerability","title":"DNS Rebinding Protection Disabled by Default in Model Context Protocol Go SDK for Servers Running on Localhost","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-xw59-hvm2-8pj6","CVE-2026-34742"],"plain_summary":"GitHub lists this reviewed advisory for github.com/modelcontextprotocol/go-sdk. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-6ab2640eb29f0736c1ed73ca997a6576"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-07-21T14:58:59.000Z","value":"8.1 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-6ab2640eb29f0736c1ed73ca997a6576"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-6ab2640eb29f0736c1ed73ca997a6576","url":"https://github.com/advisories/GHSA-xw59-hvm2-8pj6","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-xw59-hvm2-8pj6","publisher":"GitHub Advisory Database","observed_at":"2026-11-03T22:34:49.300Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-6ab2640eb29f0736c1ed73ca997a6576"],"technology":"github.com/modelcontextprotocol/go-sdk","known_exclusions":[],"conditions_summary":"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.\n\nNote that running HTTP-based MCP servers locally without authentication is not recommended per MCP security best practices. This issue does not affect servers using stdio transport.\n\nServers created via `StreamableHTTPHandler` or `SSEHandler` now have this protection enabled by default when binding to `localhost`. Users are advised to update to version `1.4.0` to receive this automatic protection.","public_affected_ranges":["< 1.4.0"]}],"null_published_at":"2026-11-04T10:04:27.935Z","source_updated_at":"2026-07-21T14:58:59.000Z","source_disclosed_at":"2026-04-01T21:09:09.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-03T22:34:49.300Z"}],"next_cursor":null,"snapshot_revision":"42594"}