Executive Intelligence Brief

A critical OS command injection vulnerability, CVE-2026-91140, has been identified in Progress Software Autonomous REST Connector GenAI Agents ARCGenAI-Generator version 2.0. This vulnerability allows an attacker to execute arbitrary commands on a developer's machine by supplying a crafted Swagger/OpenAPI document. The vulnerability has a CVSS score of 9.6, indicating a high severity level. Although it is not actively exploited, the high impact and ease of exploitation make it a significant risk. Immediate patching to version 2.1 or later is strongly recommended.

Threat Overview

The Progress Software Autonomous REST Connector GenAI Agents ARCGenAI-Generator is a tool used for generating APIs. Version 2.0 of this tool is affected by an OS command injection vulnerability. This vulnerability occurs in the shell-based temporary-file cleanup instructions. An attacker can exploit this vulnerability by supplying a crafted Swagger/OpenAPI document, which, when processed by the generator, allows the execution of arbitrary commands on the developer's machine. This vulnerability matters to the broader security landscape because it can lead to remote code execution, potentially allowing attackers to gain control over the affected machine.

Technical Deep Dive

Vulnerability Classification

This vulnerability is classified as CWE-78, OS Command Injection. This class of vulnerability occurs when an application executes operating system commands in an insecure manner, allowing an attacker to inject and execute arbitrary commands. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H, indicating a network attack vector, low attack complexity, no privileges required, required user interaction, changed scope, and high impacts on confidentiality, integrity, and availability.

Root Cause Analysis

The fundamental flaw in this vulnerability is the insecure execution of OS commands in the shell-based temporary-file cleanup instructions. The component affected is the Progress Software Autonomous REST Connector GenAI Agents ARCGenAI-Generator version 2.0. The assumption violated here is that the input (Swagger/OpenAPI document) is not properly sanitized before being used in OS commands.

Attack Vector & Chain

The attack vector involves supplying a crafted Swagger/OpenAPI document to the generator. The preconditions are that the attacker must be able to provide this document to the generator, and a user must invoke the generator. User interaction is required in the sense that a user must trigger the processing of the crafted document. The vulnerability can be chained with other vulnerabilities if the attacker gains initial access through this vulnerability and then exploits other weaknesses for privilege escalation or lateral movement.

Exploitation Scenario Walkthrough

Scenario: Remote Code Execution via Crafted Swagger/OpenAPI Document
Reconnaissance: An attacker discovers a vulnerable instance of Progress Software Autonomous REST Connector GenAI Agents ARCGenAI-Generator version 2.0.
Weaponization: The attacker crafts a Swagger/OpenAPI document that contains malicious OS commands.
Delivery & Exploitation: The attacker supplies the crafted document to the generator, and a user invokes the generator, triggering the execution of the malicious commands.
Post-Exploitation: After gaining initial access, the attacker may attempt to escalate privileges, move laterally within the network, or establish persistence mechanisms.
Impact Realization: The final damage could be the execution of arbitrary commands, potentially leading to data exfiltration, ransomware deployment, or supply chain poisoning.

Exploitation in the Wild

This vulnerability is not actively exploited at the time of publication. However, given its high severity and the ease of exploitation, there is a high likelihood that attackers will target this vulnerability in the future.

Impact Analysis

Direct Impact

The direct impact of this vulnerability is the execution of arbitrary OS commands on the developer's machine, potentially leading to remote code execution, data exfiltration, or other malicious activities. The impact is considered high due to the potential for significant damage.

Downstream & Cascading Effects

The downstream effects could include supply chain risk, regulatory implications, customer data exposure, and operational disruption. The blast radius across dependent systems and services could be significant if the vulnerability is exploited.

Affected Products & Versions

The affected product is Progress Software Autonomous REST Connector GenAI Agents ARCGenAI-Generator version 2.0. The fixed version is 2.1 or later.

Detection & Threat Hunting

Indicators of Compromise

No specific indicators of compromise are provided in the source data.

Detection Rules & Signatures

Detection logic could involve monitoring for suspicious Swagger/OpenAPI documents being processed by the generator, and monitoring system logs for signs of OS command injection attacks. Relevant MITRE ATT&CK techniques include T1190 (Exploit Public-Facing Application) and T1059 (Command and Scripting Interpreter).

Threat Hunting Queries

Threat hunting queries could involve searching for unusual or suspicious activity related to the generator, such as unexpected OS commands being executed or unusual network traffic.

Remediation & Hardening

Immediate Actions (0-24 hours)

Immediate patching to version 2.1 or later is strongly recommended. In the absence of a patch, restricting access to the generator and ensuring that users invoking the generator are aware of the risks can help mitigate the vulnerability.

Short-Term Hardening (1-7 days)

Additional security controls could include network segmentation, WAF rules to detect and prevent malicious Swagger/OpenAPI documents, and access restrictions to limit who can invoke the generator.

Strategic Recommendations

Long-term recommendations include ensuring that all inputs to the generator are properly sanitized, implementing secure coding practices to prevent OS command injection, and conducting regular security audits and vulnerability assessments.

Analyst Assessment

The threat trajectory of this vulnerability is concerning due to its high severity and the potential for exploitation. Organizations should prioritize patching and implementing additional security controls to mitigate the risk.

Sources

  • National Vulnerability Database (NVD) - https://nvd.nist.gov/vuln/detail/CVE-2026-91140