{"items":[{"id":"NVI-00011756","kind":"vulnerability","title":"MCP TypeScript SDK: One HTTP request within the default size limit could exhaust server memory during validation","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-46jr-4wx8-v453","CVE-2026-111768"],"plain_summary":"GitHub lists this reviewed advisory for @modelcontextprotocol/sdk, @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-1b3440a09c9c81c0bf7f87f39ac8e5d7"],"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":"2026-10-20T20:06:38.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-1b3440a09c9c81c0bf7f87f39ac8e5d7"}],"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-1b3440a09c9c81c0bf7f87f39ac8e5d7","url":"https://github.com/advisories/GHSA-46jr-4wx8-v453","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-46jr-4wx8-v453","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T23:13:39.183Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1b3440a09c9c81c0bf7f87f39ac8e5d7"],"technology":"@modelcontextprotocol/sdk","known_exclusions":[],"conditions_summary":"### Summary\nIn affected versions, servers put no limit on how many array elements and object keys they validated in one request. One HTTP request within the default 4 MiB size limit could exhaust the server's memory, and the process aborted with `JavaScript heap out of memory`.\n\nNo credentials are needed, unless you authenticate requests before they reach the SDK.\n\n### Am I affected?\nYes, if clients you do not fully trust can reach your server over HTTP. The risk is highest for `McpServer` tools whose input contains an array or a record. stdio-only servers are not affected.\n\nAffected versions:\n\n- `@modelcontextprotocol/sdk` 1.3.0 through 1.31.0\n- `@modelcontextprotocol/server` 2.0.0 through 2.2.0\n\n### Fix\nUpgrade to:\n\n- 1.x: `@modelcontextprotocol/sdk` 1.32.0 or later\n- 2.x: `@modelcontextprotocol/server` 2.3.0 or later\n\n**Upgrading alone changes nothing.** The patched versions add an `McpServer` option, `maxToolInputElements`, that is off by default. Make both of these changes:\n\n1. Set `maxToolInputElements` just above the largest input your tools need, for example `new McpServer(info, { maxToolInputElements: 10_000 })`. It counts array elements and object keys in a call's argumen","public_affected_ranges":[">= 1.3.0, < 1.32.0"]},{"certainty":"source_listed","source_ids":["sr-1b3440a09c9c81c0bf7f87f39ac8e5d7"],"technology":"@modelcontextprotocol/server","known_exclusions":[],"conditions_summary":"### Summary\nIn affected versions, servers put no limit on how many array elements and object keys they validated in one request. One HTTP request within the default 4 MiB size limit could exhaust the server's memory, and the process aborted with `JavaScript heap out of memory`.\n\nNo credentials are needed, unless you authenticate requests before they reach the SDK.\n\n### Am I affected?\nYes, if clients you do not fully trust can reach your server over HTTP. The risk is highest for `McpServer` tools whose input contains an array or a record. stdio-only servers are not affected.\n\nAffected versions:\n\n- `@modelcontextprotocol/sdk` 1.3.0 through 1.31.0\n- `@modelcontextprotocol/server` 2.0.0 through 2.2.0\n\n### Fix\nUpgrade to:\n\n- 1.x: `@modelcontextprotocol/sdk` 1.32.0 or later\n- 2.x: `@modelcontextprotocol/server` 2.3.0 or later\n\n**Upgrading alone changes nothing.** The patched versions add an `McpServer` option, `maxToolInputElements`, that is off by default. Make both of these changes:\n\n1. Set `maxToolInputElements` just above the largest input your tools need, for example `new McpServer(info, { maxToolInputElements: 10_000 })`. It counts array elements and object keys in a call's argumen","public_affected_ranges":[">= 2.0.0, < 2.3.0"]}],"null_published_at":"2026-11-01T01:03:56.600Z","source_updated_at":"2026-10-20T20:06:38.000Z","source_disclosed_at":"2026-10-20T20:06:35.000Z","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"}