CVE-2025-53365

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{"affected": [{"affectedData": [{"product": "python-sdk", "vendor": "modelcontextprotocol", "versions": [{"status": "affected", "version": "< 1.10.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The MCP Python SDK, called `mcp` on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to version 1.10.0, if a client deliberately triggers an exception after establishing a streamable HTTP session, this can lead to an uncaught ClosedResourceError on the server side, causing the server to crash and requiring a restart to restore service. Impact may vary depending on the deployment conditions, and presence of infrastructure-level resilience measures. Version 1.10.0 contains a patch for the issue."}, {"lang": "es", "value": "MCP Python SDK, llamado \u00abmcp\u00bb en PyPI, es una implementaci\u00f3n en Python del Protocolo de Contexto de Modelo (MCP). Antes de la versi\u00f3n 1.10.0, si un cliente activaba deliberadamente una excepci\u00f3n tras establecer una sesi\u00f3n HTTP con transmisi\u00f3n, esto pod\u00eda generar un error ClosedResourceError no detectado en el servidor, lo que provocaba un fallo del servidor y requer\u00eda un reinicio para restablecer el servicio. El impacto puede variar seg\u00fan las condiciones de implementaci\u00f3n y la presencia de medidas de resiliencia a nivel de infraestructura. La versi\u00f3n 1.10.0 incluye un parche para este problema."}], "id": "CVE-2025-53365", "lastModified": "2026-06-17T09:38:05.940", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-53365", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-07-08T13:53:26.324368Z", "version": "2.0.3"}}]}, "published": "2025-07-04T22:15:22.117", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891"}, {"source": "security-advisories@github.com", "url": "https://github.com/modelcontextprotocol/python-sdk/pull/967"}, {"source": "security-advisories@github.com", "url": "https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-248"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "mcp: MCP Server Crash via ClosedResourceError", "id": "2376486", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2376486"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-248", "details": ["The MCP Python SDK, called `mcp` on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to version 1.10.0, if a client deliberately triggers an exception after establishing a streamable HTTP session, this can lead to an uncaught ClosedResourceError on the server side, causing the server to crash and requiring a restart to restore service. Impact may vary depending on the deployment conditions, and presence of infrastructure-level resilience measures. Version 1.10.0 contains a patch for the issue.", "A flaw was found in MCP. The `mcp` Python SDK exhibits an uncaught exception when a client intentionally triggers an error following the establishment of a streamable HTTP session. This condition allows a remote attacker to cause a program crash. The vulnerability stems from a lack of exception handling during the session lifecycle."], "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-2025-53365", "package_state": [{"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Affected", "package_name": "openshift-lightspeed/lightspeed-service-api-rhel9", "product_name": "OpenShift Lightspeed"}], "public_date": "2025-07-04T22:03:46Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-53365\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-53365\nhttps://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891\nhttps://github.com/modelcontextprotocol/python-sdk/pull/967\nhttps://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh"], "statement": "The severity of this vulnerability is rated Moderate, as it does not impact system availability. The effects are confined to the application layer without compromising the underlying system stability.", "threat_severity": "Moderate"}

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