CVE-2026-55673 PowSyBl: Command Injection in LocalCommandExecutor-s
Attackers can execute arbitrary shell commands via unsanitized inputs in PowSyBl's local command executors, affecting power system analysis tools.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-55673?
CVE-2026-55673 is a high-severity command injection vulnerability in powsybl-core, published on 28 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-55673?
2 open source packages ship an affected version, including com.powsybl:powsybl-computation-local.
| Package | Affected | Fixed in |
|---|---|---|
com.powsybl:powsybl-computation-local Maven | All versions | 7.2.2 |
com.powsybl:powsybl-computation-local Maven | All versions | 7.2.2 |
How do I fix CVE-2026-55673?
Upgrade com.powsybl:powsybl-computation-local to 7.2.2 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-55673 being exploited?
There is no known exploitation of CVE-2026-55673 in the wild and no public exploit code.
Sources
Also known as GHSA-jqvf-j3ww-r8c7.