Detections
Analytics
SCA: security update for mcp (GHSA-84m7-p3x7-pcfv)
medium Tenable Cloud Security Plugin ID 474708
Description
There are packages installed that are affected by a vulnerability referenced in the following CVE:- The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP).
From 1.8.0 until 1.30.0 and 2.2.0, stateful Streamable HTTP servers, including FastMCP, MCPServer,
Server.streamable_http_app(), and StreamableHTTPSessionManager, retain session entries without an idle
expiration or aggregate session-count limit. DELETE, refused opening requests, and completed sessions do
not reliably discard their entries, and each entry can retain parsed initialize parameters. A client that
can reach the endpoint can therefore create ordinary short requests that grow server memory without bound
until restart. Stateless HTTP, stdio, and SSE transports are not affected. This issue is fixed in versions
1.30.0 and 2.2.0. (CVE-2026-59951)
Solution
Update the mcp library and its related packages to version 1.30.0 or later.See Also
Plugin Details
Severity: Medium
ID: 474708
Version: Revision 1.1
Type: Local
Family: SCA Checks
Published: 10/16/2026
Updated: 10/16/2026
Risk Information
VPR
Risk Factor: Medium
Score: 4.3
Percentile: 53.45
Vendor
Vendor Severity: Medium
CVSS v2
Risk Factor: High
Base Score: 7.8
Temporal Score: 5.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS Score Source: CVE-2026-59951
CVSS v3
Risk Factor: High
Base Score: 7.5
Temporal Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS v4
Risk Factor: Medium
Base Score: 6.9
Threat Score: 2.7
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Vulnerability Information
Exploit Ease: No known exploits are available
Patch Publication Date: 10/15/2026
Vulnerability Publication Date: 10/14/2026
Reference Information
CVE: CVE-2026-59951