---
id: CVE-2026-55673
title: >-
  PowSyBl (Power System Blocks) is a framework to build power system oriented
  software
summary: >-
  PowSyBl (Power System Blocks) is a framework to build power system oriented
  software. Prior to 7.2.2, UnixLocalCommandExecutor and
  WindowsLocalCommandExecutor concatenate command arguments and environment
  variables into strings interpret…
severity: high
cwe:
  - CWE-78
  - CWE-88
vendor: powsybl
product: 'com.powsybl:powsybl-computation-local'
affected:
  - 'com.powsybl:powsybl-computation-local <= 7.2.1'
patched:
  - 'com.powsybl:powsybl-computation-local 7.2.2'
published: '2026-08-28'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:09:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55673'
references:
  - url: >-
      https://github.com/powsybl/powsybl-core/commit/17461264d1d18f9bba43bb7855f251e9fa55a4db
    label: security-advisories@github.com
  - url: >-
      https://github.com/powsybl/powsybl-core/commit/7aa28d8c2492bbcd061585cb498acce72d5ed79a
    label: security-advisories@github.com
  - url: 'https://github.com/powsybl/powsybl-core/pull/3973'
    label: security-advisories@github.com
  - url: 'https://github.com/powsybl/powsybl-core/releases/tag/v7.2.2'
    label: security-advisories@github.com
  - url: >-
      https://github.com/powsybl/powsybl-core/security/advisories/GHSA-jqvf-j3ww-r8c7
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-jqvf-j3ww-r8c7'
tags:
  - nvd
  - ghsa
  - maven
epss: 0.00426
epssPercentile: 0.36505
aliases:
  - GHSA-jqvf-j3ww-r8c7
ecosystem: maven
ingestedAt: '2026-08-28T19:24:19.271Z'
---

## Overview

PowSyBl (Power System Blocks) is a framework to build power system oriented software. Prior to 7.2.2, UnixLocalCommandExecutor and WindowsLocalCommandExecutor concatenate command arguments and environment variables into strings interpreted through bash -c or cmd /c without sufficient escaping. Attacker-controlled values reaching UnixLocalCommandExecutor.execute, WindowsLocalCommandExecutor.execute, LocalComputationManager.execute, ParallelLoadFlowActionSimulator.run, ActionSimulatorTool.run, AmplModelRunner.run, or AmplModelRunner.runAsync can break out of the intended command and execute arbitrary shell commands as the JVM user. The affected itools paths include action-simulator with task-count, security-analysis with external, and dynamic-security-analysis. Downstream CLI tools, libraries, REST front ends, and multi-tenant grid-analysis services that forward less-trusted contingency identifiers or computation parameters into these APIs can expose the injection remotely. This issue is fixed in version 7.2.2.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55673)

Affected packages:

- `com.powsybl:powsybl-computation-local <= 7.2.1`

Patched in:

- `com.powsybl:powsybl-computation-local 7.2.2`

Source: https://github.com/advisories/GHSA-jqvf-j3ww-r8c7