{"items":[{"id":"NVI-00016068","kind":"vulnerability","title":"Anthropic's MCP TypeScript SDK has a ReDoS vulnerability","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-8r9q-7v3j-jr4g","CVE-2026-0621"],"plain_summary":"GitHub lists this reviewed advisory for @modelcontextprotocol/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-15548202d3baf2bc6884bd1201226885"],"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":[],"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-15548202d3baf2bc6884bd1201226885","url":"https://github.com/advisories/GHSA-8r9q-7v3j-jr4g","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-8r9q-7v3j-jr4g","publisher":"GitHub Advisory Database","observed_at":"2026-11-04T09:59:43.724Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-15548202d3baf2bc6884bd1201226885"],"technology":"@modelcontextprotocol/sdk","known_exclusions":[],"conditions_summary":"### Impact\n\nA ReDoS vulnerability in the `UriTemplate` class allows attackers to cause denial of service. The `partToRegExp()` function generates a regex pattern with nested quantifiers (`([^/]+(?:,[^/]+)*)`) for exploded template variables (e.g., `{/id*}`, `{?tags*}`), causing catastrophic backtracking on malicious input.\n\n**Who is affected:** MCP servers that register resource templates with exploded array patterns and accept requests from untrusted clients.\n\n**Attack result:** An attacker sends a crafted URI via `resources/read` request, causing 100% CPU utilization, server hang/crash, and denial of service for all clients.\n\n### Affected Versions\n\nAll versions of `@modelcontextprotocol/sdk` prior to the patched release.\n\n### Patches\n\nv1.25.2 contains b392f02ffcf37c088dbd114fedf25026ec3913d3 the fix modifies the regex pattern to prevent backtracking.\n\n### Workarounds\n\n- Avoid using exploded patterns (`{/id*}`, `{?tags*}`) in resource templates\n- Implement request timeouts and rate limiting\n- Validate URIs before processing to reject suspicious patterns","public_affected_ranges":[">= 1.3.0, < 1.25.2"]}],"null_published_at":"2026-11-04T10:04:27.875Z","source_updated_at":"2026-07-15T18:32:07.000Z","source_disclosed_at":"2026-01-05T21:30:33.000Z","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":"2026-11-04T09:59:43.724Z"}],"next_cursor":null,"snapshot_revision":"42594"}