CVE-2026-111770

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{"bugzilla": {"description": "@modelcontextprotocol/server: @modelcontextprotocol/server: Information disclosure via shared HTTP transport instance", "id": "2567856", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567856"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L", "status": "draft"}, "cwe": "CWE-488", "details": ["A flaw was found in @modelcontextprotocol/server. When a Model Context Protocol (MCP) server handling HTTP traffic reuses a single server or transport instance across multiple connections, messages are matched solely using request identifiers that frequently collide. A remote client can trigger or encounter this condition during normal operation to receive another client's responses and notifications, resulting in information disclosure."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-111770", "public_date": "2026-11-05T21:28:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-111770\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-111770\nhttps://github.com/modelcontextprotocol/typescript-sdk/commit/84804c22e45a662675a198f853b7f00063838a8d\nhttps://github.com/modelcontextprotocol/typescript-sdk/pull/2918\nhttps://github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.32.0\nhttps://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/server@2.3.0\nhttps://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-jm63-cq47-j5jp"], "statement": "This vulnerability is evaluated as having a Moderate impact because exploitation depends on an architectural condition where a service reuses a shared server instance across concurrent connections instead of generating per-request handlers. In deployments utilizing standard input/output communication channels or per-call factory implementations, this condition cannot be triggered. Although concurrent HTTP endpoints with shared instances allow unauthorized recipients to receive message payloads meant for other callers, this architectural dependency limits the operational risk.", "threat_severity": "Moderate"}

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