{"items":[{"id":"NVI-00011874","kind":"vulnerability","title":"MCP  TypeScript server SDK: Shared transport or server instances delivered one HTTP client's messages to another","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-jm63-cq47-j5jp","CVE-2026-111770"],"plain_summary":"GitHub lists this reviewed advisory for @modelcontextprotocol/server. 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-2987ecb4f845242c4e727aabda0b3d2b"],"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":"2026-10-20T20:08:02.000Z","value":"7.7 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-4bdd30e811cc087ef042edde1110eb4e"},{"kind":"CVSS","as_of":"2026-11-05T22:17:45.817Z","value":"7.7 HIGH (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-2987ecb4f845242c4e727aabda0b3d2b"}],"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-4bdd30e811cc087ef042edde1110eb4e","url":"https://github.com/advisories/GHSA-jm63-cq47-j5jp","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-jm63-cq47-j5jp","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T23:13:39.183Z"},{"id":"sr-2987ecb4f845242c4e727aabda0b3d2b","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111770","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-111770","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-07T00:52:31.698Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-4bdd30e811cc087ef042edde1110eb4e"],"technology":"@modelcontextprotocol/server","known_exclusions":[],"conditions_summary":"### Summary\nIn affected versions, an MCP server reached over HTTP could deliver one client's responses and notifications to another client. This happened when clients shared one stateless transport, or one `McpServer` or `Server` instance.\n\nMessages were matched to a connection by JSON-RPC `id` alone. SDK clients number requests from 0, so ids collide in normal use.\n\n### Am I affected?\nYes, if more than one client can reach your HTTP endpoint and your code creates the transport or the server once at startup, instead of once per request or per session. Until this release, the README examples of `@modelcontextprotocol/hono`, `express`, `fastify` and `node` showed that pattern.\n\nAffected versions: `@modelcontextprotocol/server` 2.0.0 through 2.2.0.\n\nNot affected:\n\n- `createMcpHandler()` with a factory that builds a new server on every call\n- stdio servers\n- `@modelcontextprotocol/sdk` 1.26.0 and later\n\n### Fix\nUpgrade to `@modelcontextprotocol/server` 2.3.0 or later.\n\n**You also need to change your code.** The SDK now refuses to be shared, so an affected app fails requests after upgrading: a second `connect()` rejects with `ALREADY_CONNECTED`, and a stateless transport rejects its sec","public_affected_ranges":[">= 2.0.0, < 2.3.0"]}],"null_published_at":"2026-11-07T18:43:12.078Z","source_updated_at":"2026-10-20T20:08:02.000Z","source_disclosed_at":"2026-10-20T20:07:29.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T23:13:39.183Z"},{"id":"NVI-00011874","kind":"vulnerability","title":"MCP  TypeScript server SDK: Shared transport or server instances delivered one HTTP client's messages to another","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-jm63-cq47-j5jp","CVE-2026-111770"],"plain_summary":"GitHub lists this reviewed advisory for @modelcontextprotocol/server. 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-4bdd30e811cc087ef042edde1110eb4e"],"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":"2026-10-20T20:08:02.000Z","value":"7.7 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-4bdd30e811cc087ef042edde1110eb4e"}],"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-4bdd30e811cc087ef042edde1110eb4e","url":"https://github.com/advisories/GHSA-jm63-cq47-j5jp","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-jm63-cq47-j5jp","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T23:13:39.183Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-4bdd30e811cc087ef042edde1110eb4e"],"technology":"@modelcontextprotocol/server","known_exclusions":[],"conditions_summary":"### Summary\nIn affected versions, an MCP server reached over HTTP could deliver one client's responses and notifications to another client. This happened when clients shared one stateless transport, or one `McpServer` or `Server` instance.\n\nMessages were matched to a connection by JSON-RPC `id` alone. SDK clients number requests from 0, so ids collide in normal use.\n\n### Am I affected?\nYes, if more than one client can reach your HTTP endpoint and your code creates the transport or the server once at startup, instead of once per request or per session. Until this release, the README examples of `@modelcontextprotocol/hono`, `express`, `fastify` and `node` showed that pattern.\n\nAffected versions: `@modelcontextprotocol/server` 2.0.0 through 2.2.0.\n\nNot affected:\n\n- `createMcpHandler()` with a factory that builds a new server on every call\n- stdio servers\n- `@modelcontextprotocol/sdk` 1.26.0 and later\n\n### Fix\nUpgrade to `@modelcontextprotocol/server` 2.3.0 or later.\n\n**You also need to change your code.** The SDK now refuses to be shared, so an affected app fails requests after upgrading: a second `connect()` rejects with `ALREADY_CONNECTED`, and a stateless transport rejects its sec","public_affected_ranges":[">= 2.0.0, < 2.3.0"]}],"null_published_at":"2026-11-01T01:03:56.612Z","source_updated_at":"2026-10-20T20:08:02.000Z","source_disclosed_at":"2026-10-20T20:07:29.000Z","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":"2026-10-31T23:13:39.183Z"}],"next_cursor":null,"snapshot_revision":"42594"}