External risk intelligence

NASA cFS Executive Services Code Execution Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2026-67979

NASA cFS (Core Flight System) is a platform designed specifically for embedded flight software and spacecraft systems. It is not a network-facing application or edge service; it operates within isolated, specialized hardware environments where public internet reachability is not a standard deployment characteristic.

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability has been identified in NASA's Core Flight System (cFS) that could allow unauthorized code execution. This issue stems from an access control weakness within a specific component, potentially enabling attackers to place malicious code on systems. While the technology is specialized for spaceflight, understanding its exposure is crucial.

Unauthorized code can run on systems.
Specialized NASA software has a flaw.
Confirm relevance and impact for NASA systems.

Attack Path

How an attacker could exploit the issue

An attacker could gain the ability to run their own code on a system running NASA cFS by taking advantage of a flaw in how the Executive Services component manages access to dynamic application startup. This vulnerability allows someone to place a malicious shared object file onto the system's storage, which the Executive Services might then load and execute without proper checks, potentially leading to unauthorized code execution.

No authentication or user interaction needed.
Placing a shared object on target storage.
Arbitrary code execution.

Live Threat

Current exploitation, exposure, and threat context

When supported by the advisory, an incorrect access control vulnerability in the Executive Services dynamic application start path component could allow attackers to execute arbitrary code by placing a shared object on target storage. This could affect the integrity and confidentiality of system data.

System data could be compromised.
Attackers could place a shared object.
Arbitrary code execution could occur.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in NASA cFS affects the Executive Services component, a critical part of spacecraft flight software. Ownership will likely fall to the platform or application engineering teams responsible for the cFS deployment, in coordination with the system owners and potentially vendor management if third-party integration is involved. The first step is to confirm the presence and reachability of the affected component within flight systems, assess its criticality, and then plan remediation, potentially involving vendor engagement.

Platform/application engineering owns the issue.
Verify component presence and reachability.
Plan targeted remediation based on risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Free EASM Trial See How Signal Works

Frequently asked questions

What is NASA cFS?

NASA Core Flight System (cFS) is a reusable software framework used to build embedded flight software for spacecraft. It provides a platform-independent environment for managing onboard systems, enabling developers to build modular applications that handle everything from instrument control to complex navigation in isolated hardware environments.

What does this CVE-2026-67979 vulnerability mean?

This is an improper access control issue, categorized under CWE-284. It means the software fails to properly verify or restrict who or what can access its dynamic application startup process. Because the Executive Services component does not enforce sufficient checks, it can be tricked into loading and running unauthorized files, such as malicious shared objects, as if they were legitimate system tasks.

How does an attacker trigger this flaw?

The trigger path involves an attacker successfully placing a malicious shared object file onto the system's storage. Once the file is stored, the Executive Services component will execute it. Notably, simply having access to the system environment is the primary precondition; the vulnerability does not require authentication or user interaction to facilitate the unauthorized execution.

Is my system at risk?

According to Halo Surface Signal, risk is very unlikely for most because NASA cFS is designed for specialized, isolated flight hardware rather than network-facing services. While the CVE is classified as network-reachable in a generic sense, these systems are rarely exposed to the public internet, meaning they typically lack the connectivity required for external attackers to reach the storage path described.

How should I respond to this advisory?

If you manage a deployment, work with your flight software or platform engineering teams to identify if your specific architecture uses the affected Executive Services component. Verify the security of your file storage and access controls, and confirm if your system's design permits the external writing of files to storage. Prioritize these checks based on the mission criticality of the specific cFS deployment.

References

github.com/nasa/cFS/issues/1057

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.