CVE-2026-7404: Mcpo simple server Path Traversal Vulnerability

MODERATE
Advisory Identifier: GHSA-3jmq-qhg3-f58j
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CVSS 7.3
CWE-22
Published
Advisory Summary

CVE-2026-7404 is a MODERATE (CVSS 7.3) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting Mcpo simple server libraries in the PyPI ecosystem. The issue involves mcpo-simple-server has a path traversal issue. Remediation is available in the latest vendor maintenance releases.

CVE-2026-7404 at a Glance

CVE Identifier CVE-2026-7404
GHSA Identifier GHSA-3jmq-qhg3-f58j
Severity MODERATE
CVSS v3.1 Base Score 7.3
CWE Classification CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Affected Product Mcpo simple server
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability Low (A:L)

How to Fix CVE-2026-7404

To remediate this vulnerability, upgrade all affected Mcpo simple server dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

mcpo-simple-server fixed: Latest secure release 
pip install mcpo-simple-server>=Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show mcpo-simple-server

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-7404, inspect your installed packages using pip:

pip show mcpo-simple-server

Analyze the terminal output to locate any version of Mcpo simple server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The pip show mcpo-simple-server command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In Mcpo simple server, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A weakness has been identified in getsimpletool mcpo-simple-server up to 0.2.0. Affected is the function delete_shared_prompt of the file src/mcpo_simple_server/services/prompt_manager/base_manager.py. This manipulation of the argument detail causes relative path traversal. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

CVE-2026-7404 Affected Mcpo simple server Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
mcpo-simple-server
pypi/mcpo-simple-server
PyPI
≤ 0.2.0

References

NVD — CVE-2026-7404 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-7404
Mcpo simple server Source Repository REPOSITORY
https://github.com/getsimpletool/mcpo-simple-server/issues/4
Mcpo simple server Source Repository REPOSITORY
https://github.com/getsimpletool/mcpo-simple-server
vuldb.com/submit/803612 WEB
https://vuldb.com/submit/803612
vuldb.com/vuln/360140 WEB
https://vuldb.com/vuln/360140
vuldb.com/vuln/360140/cti WEB
https://vuldb.com/vuln/360140/cti

Frequently Asked Questions

What is CVE-2026-7404?
CVE-2026-7404 is a security vulnerability in Mcpo simple server involving mcpo-simple-server has a Path Traversal issue under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal').
Which Mcpo simple server versions are affected?
Affected versions include releases prior to current release patches across affected packages: mcpo-simple-server.
What version fixes CVE-2026-7404?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is mcpo-simple-server affected?
Yes, mcpo-simple-server is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-7404?
CVE-2026-7404 has a CVSS v3.1 base score of 7.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2026-7404?
CVE-2026-7404 is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.).
How can I check PyPI dependencies for CVE-2026-7404?
Run the dependency tree command: 'pip show mcpo-simple-server'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3jmq-qhg3-f58j",
  "modified" : "2026-05-06T23:12:31Z",
  "published" : "2026-04-29T21:31:31Z",
  "aliases" : [ "CVE-2026-7404" ],
  "summary" : "mcpo-simple-server has a Path Traversal issue",
  "details" : "A weakness has been identified in getsimpletool mcpo-simple-server up to 0.2.0. Affected is the function delete_shared_prompt of the file src/mcpo_simple_server/services/prompt_manager/base_manager.py. This manipulation of the argument detail causes relative path traversal. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "mcpo-simple-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.2.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-7404"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/getsimpletool/mcpo-simple-server/issues/4"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/getsimpletool/mcpo-simple-server"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/803612"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/360140"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/360140/cti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-06T23:12:31Z",
    "nvd_published_at" : "2026-04-29T21:16:22Z"
  }
}