CVE-2026-30625: Upsonic Remote Code Execution Vulnerability

CRITICAL
Advisory Identifier: GHSA-cw73-5f7h-m4gv
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CVSS 9.8
CWE-77
Published
Advisory Summary

CVE-2026-30625 is a CRITICAL (CVSS 9.8) remote code execution vulnerability (CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')) affecting Upsonic libraries in the PyPI ecosystem. The issue involves remote code execution vulnerability in its mcp server/task creation functionality. Remediation is available by upgrading affected packages to version 0.72.0.

CVE-2026-30625 at a Glance

CVE Identifier CVE-2026-30625
GHSA Identifier GHSA-cw73-5f7h-m4gv
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
Affected Product Upsonic
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:H/I:H/A:H).

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 High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-30625

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

upsonic fixed: 0.72.0 
pip install upsonic>=0.72.0
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 upsonic

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-30625, inspect your installed packages using pip:

pip show upsonic

Analyze the terminal output to locate any version of Upsonic in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.72.0), your application is affected.

Note: The pip show upsonic command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection'), where the product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. In Upsonic, 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

Upsonic 0.71.6 contains a remote code execution vulnerability in its MCP server/task creation functionality. The application allows users to define MCP tasks with arbitrary command and args values. Although an allowlist exists, certain allowed commands (npm, npx) accept argument flags that enable execution of arbitrary OS commands. Maliciously crafted MCP tasks may lead to remote code execution with the privileges of the Upsonic process. In version 0.72.0 Upsonic added a warning about using Stdio servers being able to execute commands directly on the machine.

CVE-2026-30625 Affected Upsonic Versions

1 component(s)
Fixed Versions:
0.72.0
Product / Package Ecosystem Affected Versions Fixed Version
upsonic
pypi/upsonic
PyPI
< 0.72.0
0.72.0

References

NVD — CVE-2026-30625 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-30625
Security Fix Commit FIX COMMIT
https://github.com/Upsonic/Upsonic/commit/855053fce0662227d9246268ff4a0844b481a305
Upsonic Source Repository REPOSITORY
https://github.com/Upsonic/Upsonic
Upsonic Security Information SECURITY
https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem

Frequently Asked Questions

What is CVE-2026-30625?
CVE-2026-30625 is a security vulnerability in Upsonic involving remote code execution vulnerability in its MCP server/task creation functionality under CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection').
Which Upsonic versions are affected?
Affected versions include releases prior to 0.72.0 across affected packages: upsonic.
What version fixes CVE-2026-30625?
Upgrading to 0.72.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is upsonic affected?
Yes, upsonic is affected in releases prior to 0.72.0. Upgrade your dependency to 0.72.0 or later.
What is the CVSS score of CVE-2026-30625?
CVE-2026-30625 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-30625?
CVE-2026-30625 is classified under CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') (The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.).
How can I check PyPI dependencies for CVE-2026-30625?
Run the dependency tree command: 'pip show upsonic'. 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-cw73-5f7h-m4gv",
  "modified" : "2026-04-16T21:33:09Z",
  "published" : "2026-04-15T18:31:57Z",
  "aliases" : [ "CVE-2026-30625" ],
  "summary" : "Upsonic: remote code execution vulnerability in its MCP server/task creation functionality",
  "details" : "Upsonic 0.71.6 contains a remote code execution vulnerability in its MCP server/task creation functionality. The application allows users to define MCP tasks with arbitrary command and args values. Although an allowlist exists, certain allowed commands (npm, npx) accept argument flags that enable execution of arbitrary OS commands. Maliciously crafted MCP tasks may lead to remote code execution with the privileges of the Upsonic process. In version 0.72.0 Upsonic added a warning about using Stdio servers being able to execute commands directly on the machine.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "upsonic"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.72.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-30625"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Upsonic/Upsonic/commit/855053fce0662227d9246268ff4a0844b481a305"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/Upsonic/Upsonic"
  }, {
    "type" : "WEB",
    "url" : "https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-77" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-16T21:33:09Z",
    "nvd_published_at" : "2026-04-15T16:16:36Z"
  }
}