Action not permitted
Modal body text goes here.
Modal Title
Modal Body
GHSA-J975-95F5-7WQH
Vulnerability from github – Published: 2025-07-04 22:06 – Updated: 2026-07-16 18:30
VLAI
Summary
MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service
Details
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.
Thank you to Rich Harang for reporting this issue.
Severity
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "mcp"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.10.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2025-53365"
],
"database_specific": {
"cwe_ids": [
"CWE-248"
],
"github_reviewed": true,
"github_reviewed_at": "2025-07-04T22:06:31Z",
"nvd_published_at": "2025-07-04T22:15:22Z",
"severity": "HIGH"
},
"details": "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.\n\nThank you to Rich Harang for reporting this issue.",
"id": "GHSA-j975-95f5-7wqh",
"modified": "2026-07-16T18:30:53Z",
"published": "2025-07-04T22:06:31Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53365"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/pull/967"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "PACKAGE",
"url": "https://github.com/modelcontextprotocol/python-sdk"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.10.0"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/mcp/PYSEC-2026-1618.yaml"
},
{
"type": "WEB",
"url": "https://pypi.org/project/mcp"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service"
}
BREW-CYCODE-CVE-2025-53365 (GHSA-J975-95F5-7WQH)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:42 – Updated: 2026-09-17 18:32 – Source website
VLAI
Summary
MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service
Details
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.
Thank you to Rich Harang for reporting this issue.
Severity
References
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "mcp",
"resource_purl": "pkg:pypi/mcp@1.30.0",
"upstream_fixed_in": "1.10.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "cycode",
"purl": "pkg:brew/cycode"
},
"ranges": [
{
"events": [
{
"introduced": "3.2.0"
},
{
"fixed": "3.2.1_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/mcp@1.30.0",
"name": "mcp",
"resource": "mcp",
"strategy": "registry",
"subject_version": "1.30.0"
}
]
},
"details": "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.\n\nThank you to Rich Harang for reporting this issue.",
"id": "BREW-cycode-CVE-2025-53365",
"modified": "2026-09-17T18:32:20Z",
"published": "2026-08-13T16:42:07Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53365"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/pull/967"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "PACKAGE",
"url": "https://github.com/modelcontextprotocol/python-sdk"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.10.0"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/mcp/PYSEC-2026-1618.yaml"
},
{
"type": "WEB",
"url": "https://pypi.org/project/mcp"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service",
"upstream": [
"GHSA-j975-95f5-7wqh",
"CVE-2025-53365",
"PYSEC-2026-1618"
]
}
BREW-FASTMCP-CVE-2025-53365 (GHSA-J975-95F5-7WQH)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:46 – Updated: 2026-09-09 23:56 – Source website
VLAI
Summary
MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service
Details
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.
Thank you to Rich Harang for reporting this issue.
Severity
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "mcp",
"resource_purl": "pkg:pypi/mcp@2.1.1",
"upstream_fixed_in": "1.10.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "fastmcp",
"purl": "pkg:brew/fastmcp"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.4.7"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/mcp@2.1.1",
"name": "mcp",
"resource": "mcp",
"strategy": "registry",
"subject_version": "2.1.1"
}
]
},
"details": "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.\n\nThank you to Rich Harang for reporting this issue.",
"id": "BREW-fastmcp-CVE-2025-53365",
"modified": "2026-09-09T23:56:32Z",
"published": "2026-08-13T16:46:31Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53365"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/pull/967"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "PACKAGE",
"url": "https://github.com/modelcontextprotocol/python-sdk"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.10.0"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/mcp/PYSEC-2026-1618.yaml"
},
{
"type": "WEB",
"url": "https://pypi.org/project/mcp"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service",
"upstream": [
"GHSA-j975-95f5-7wqh",
"CVE-2025-53365",
"PYSEC-2026-1618"
]
}
BREW-GPTME-CVE-2025-53365 (GHSA-J975-95F5-7WQH)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:54 – Updated: 2026-09-10 00:05 – Source website
VLAI
Summary
MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service
Details
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.
Thank you to Rich Harang for reporting this issue.
Severity
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "mcp",
"resource_purl": "pkg:pypi/mcp@1.29.0",
"upstream_fixed_in": "1.10.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "gptme",
"purl": "pkg:brew/gptme"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.32.1_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/mcp@1.29.0",
"name": "mcp",
"resource": "mcp",
"strategy": "registry",
"subject_version": "1.29.0"
}
]
},
"details": "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.\n\nThank you to Rich Harang for reporting this issue.",
"id": "BREW-gptme-CVE-2025-53365",
"modified": "2026-09-10T00:05:56Z",
"published": "2026-08-13T16:54:46Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53365"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/pull/967"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "PACKAGE",
"url": "https://github.com/modelcontextprotocol/python-sdk"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.10.0"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/mcp/PYSEC-2026-1618.yaml"
},
{
"type": "WEB",
"url": "https://pypi.org/project/mcp"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service",
"upstream": [
"GHSA-j975-95f5-7wqh",
"CVE-2025-53365",
"PYSEC-2026-1618"
]
}
BREW-KIMI-CLI-CVE-2025-53365 (GHSA-J975-95F5-7WQH)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:01 – Updated: 2026-09-10 00:17 – Source website
VLAI
Summary
MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service
Details
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.
Thank you to Rich Harang for reporting this issue.
Severity
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "mcp",
"resource_purl": "pkg:pypi/mcp@1.28.1",
"upstream_fixed_in": "1.10.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "kimi-cli",
"purl": "pkg:brew/kimi-cli"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.48.0_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/mcp@1.28.1",
"name": "mcp",
"resource": "mcp",
"strategy": "registry",
"subject_version": "1.28.1"
}
]
},
"details": "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.\n\nThank you to Rich Harang for reporting this issue.",
"id": "BREW-kimi-cli-CVE-2025-53365",
"modified": "2026-09-10T00:17:52Z",
"published": "2026-08-13T17:01:40Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53365"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/pull/967"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "PACKAGE",
"url": "https://github.com/modelcontextprotocol/python-sdk"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.10.0"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/mcp/PYSEC-2026-1618.yaml"
},
{
"type": "WEB",
"url": "https://pypi.org/project/mcp"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service",
"upstream": [
"GHSA-j975-95f5-7wqh",
"CVE-2025-53365",
"PYSEC-2026-1618"
]
}
BREW-MCP-ATLASSIAN-CVE-2… (GHSA-J975-95F5-7WQH)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:13 – Updated: 2026-09-10 00:30 – Source website
VLAI
Summary
MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service
Details
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.
Thank you to Rich Harang for reporting this issue.
Severity
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "mcp",
"resource_purl": "pkg:pypi/mcp@1.29.0",
"upstream_fixed_in": "1.10.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "mcp-atlassian",
"purl": "pkg:brew/mcp-atlassian"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.23.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/mcp@1.29.0",
"name": "mcp",
"resource": "mcp",
"strategy": "registry",
"subject_version": "1.29.0"
}
]
},
"details": "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.\n\nThank you to Rich Harang for reporting this issue.",
"id": "BREW-mcp-atlassian-CVE-2025-53365",
"modified": "2026-09-10T00:30:25Z",
"published": "2026-08-13T17:13:13Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53365"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/pull/967"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "PACKAGE",
"url": "https://github.com/modelcontextprotocol/python-sdk"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.10.0"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/mcp/PYSEC-2026-1618.yaml"
},
{
"type": "WEB",
"url": "https://pypi.org/project/mcp"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service",
"upstream": [
"GHSA-j975-95f5-7wqh",
"CVE-2025-53365",
"PYSEC-2026-1618"
]
}
BREW-MCP-GOOGLE-SHEETS-C… (GHSA-J975-95F5-7WQH)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:13 – Updated: 2026-09-10 00:30 – Source website
VLAI
Summary
MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service
Details
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.
Thank you to Rich Harang for reporting this issue.
Severity
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "mcp",
"resource_purl": "pkg:pypi/mcp@1.28.1",
"upstream_fixed_in": "1.10.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "mcp-google-sheets",
"purl": "pkg:brew/mcp-google-sheets"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.6.3_4"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/mcp@1.28.1",
"name": "mcp",
"resource": "mcp",
"strategy": "registry",
"subject_version": "1.28.1"
}
]
},
"details": "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.\n\nThank you to Rich Harang for reporting this issue.",
"id": "BREW-mcp-google-sheets-CVE-2025-53365",
"modified": "2026-09-10T00:30:25Z",
"published": "2026-08-13T17:13:13Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53365"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/pull/967"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "PACKAGE",
"url": "https://github.com/modelcontextprotocol/python-sdk"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.10.0"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/mcp/PYSEC-2026-1618.yaml"
},
{
"type": "WEB",
"url": "https://pypi.org/project/mcp"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service",
"upstream": [
"GHSA-j975-95f5-7wqh",
"CVE-2025-53365",
"PYSEC-2026-1618"
]
}
BREW-MCP-PROXY-CVE-2025-53365 (GHSA-J975-95F5-7WQH)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:13 – Updated: 2026-09-17 19:13 – Source website
VLAI
Summary
MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service
Details
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.
Thank you to Rich Harang for reporting this issue.
Severity
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "mcp",
"resource_purl": "pkg:pypi/mcp@1.28.1",
"upstream_fixed_in": "1.10.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "mcp-proxy",
"purl": "pkg:brew/mcp-proxy"
},
"ranges": [
{
"events": [
{
"introduced": "0.9.0"
},
{
"fixed": "0.10.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/mcp@1.28.1",
"name": "mcp",
"resource": "mcp",
"strategy": "registry",
"subject_version": "1.28.1"
}
]
},
"details": "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.\n\nThank you to Rich Harang for reporting this issue.",
"id": "BREW-mcp-proxy-CVE-2025-53365",
"modified": "2026-09-17T19:13:40Z",
"published": "2026-08-13T17:13:13Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53365"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/pull/967"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "PACKAGE",
"url": "https://github.com/modelcontextprotocol/python-sdk"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.10.0"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/mcp/PYSEC-2026-1618.yaml"
},
{
"type": "WEB",
"url": "https://pypi.org/project/mcp"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service",
"upstream": [
"GHSA-j975-95f5-7wqh",
"CVE-2025-53365",
"PYSEC-2026-1618"
]
}
BREW-MCPM-CVE-2025-53365 (GHSA-J975-95F5-7WQH)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:13 – Updated: 2026-09-17 19:39 – Source website
VLAI
Summary
MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service
Details
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.
Thank you to Rich Harang for reporting this issue.
Severity
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "mcp",
"resource_purl": "pkg:pypi/mcp@1.27.2",
"upstream_fixed_in": "1.10.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "mcpm",
"purl": "pkg:brew/mcpm"
},
"ranges": [
{
"events": [
{
"introduced": "1.0.3"
},
{
"fixed": "1.14.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/mcp@1.27.2",
"name": "mcp",
"resource": "mcp",
"strategy": "registry",
"subject_version": "1.27.2"
}
]
},
"details": "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.\n\nThank you to Rich Harang for reporting this issue.",
"id": "BREW-mcpm-CVE-2025-53365",
"modified": "2026-09-17T19:39:23Z",
"published": "2026-08-13T17:13:14Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53365"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/pull/967"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "PACKAGE",
"url": "https://github.com/modelcontextprotocol/python-sdk"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.10.0"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/mcp/PYSEC-2026-1618.yaml"
},
{
"type": "WEB",
"url": "https://pypi.org/project/mcp"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service",
"upstream": [
"GHSA-j975-95f5-7wqh",
"CVE-2025-53365",
"PYSEC-2026-1618"
]
}
BREW-MISTRAL-VIBE-CVE-20… (GHSA-J975-95F5-7WQH)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:14 – Updated: 2026-09-10 00:31 – Source website
VLAI
Summary
MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service
Details
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.
Thank you to Rich Harang for reporting this issue.
Severity
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "mcp",
"resource_purl": "pkg:pypi/mcp@1.28.1",
"upstream_fixed_in": "1.10.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "mistral-vibe",
"purl": "pkg:brew/mistral-vibe"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.24.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/mcp@1.28.1",
"name": "mcp",
"resource": "mcp",
"strategy": "registry",
"subject_version": "1.28.1"
}
]
},
"details": "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.\n\nThank you to Rich Harang for reporting this issue.",
"id": "BREW-mistral-vibe-CVE-2025-53365",
"modified": "2026-09-10T00:31:16Z",
"published": "2026-08-13T17:14:16Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53365"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/pull/967"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "PACKAGE",
"url": "https://github.com/modelcontextprotocol/python-sdk"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.10.0"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/mcp/PYSEC-2026-1618.yaml"
},
{
"type": "WEB",
"url": "https://pypi.org/project/mcp"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service",
"upstream": [
"GHSA-j975-95f5-7wqh",
"CVE-2025-53365",
"PYSEC-2026-1618"
]
}
BREW-OMNARA-CVE-2025-53365 (GHSA-J975-95F5-7WQH)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:19 – Updated: 2026-09-10 00:41 – Source website
VLAI
Summary
MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service
Details
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.
Thank you to Rich Harang for reporting this issue.
Severity
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "mcp",
"resource_purl": "pkg:pypi/mcp@1.24.0",
"upstream_fixed_in": "1.10.0"
},
"package": {
"ecosystem": "Homebrew",
"name": "omnara",
"purl": "pkg:brew/omnara"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.7.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/mcp@1.24.0",
"name": "mcp",
"resource": "mcp",
"strategy": "registry",
"subject_version": "1.24.0"
}
]
},
"details": "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.\n\nThank you to Rich Harang for reporting this issue.",
"id": "BREW-omnara-CVE-2025-53365",
"modified": "2026-09-10T00:41:55Z",
"published": "2026-08-13T17:19:23Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-53365"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/pull/967"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/commit/7b420656de48cfdb90b39eb582e60b6d55c2f891"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-j975-95f5-7wqh"
},
{
"type": "PACKAGE",
"url": "https://github.com/modelcontextprotocol/python-sdk"
},
{
"type": "WEB",
"url": "https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.10.0"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/mcp/PYSEC-2026-1618.yaml"
},
{
"type": "WEB",
"url": "https://pypi.org/project/mcp"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "MCP Python SDK has Unhandled Exception in Streamable HTTP Transport, Leading to Denial of Service",
"upstream": [
"GHSA-j975-95f5-7wqh",
"CVE-2025-53365",
"PYSEC-2026-1618"
]
}
Loading…
Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…
Loading…