CVE-2026-65086 Overview
CVE-2026-65086 is an OS command injection vulnerability [CWE-78] in the sandbox exec handler of NVIDIA OpenShell for Linux. An attacker with low privileges and network access can inject operating system commands into the handler. Successful exploitation can lead to arbitrary code execution, disclosure of sensitive information, and tampering of data on the affected host.
The issue is tracked in the NVIDIA Security Repository and published in the NIST National Vulnerability Database.
Critical Impact
Exploitation permits arbitrary OS command execution within the sandbox exec handler context, resulting in code execution, information disclosure, and data tampering.
Affected Products
- NVIDIA OpenShell for Linux (sandbox exec handler component)
Discovery Timeline
- 2026-08-25 - CVE-2026-65086 published to NVD
- 2026-08-26 - Last updated in NVD database
Technical Details for CVE-2026-65086
Vulnerability Analysis
The vulnerability resides in the sandbox exec handler of NVIDIA OpenShell for Linux. The handler processes input intended to be executed within a sandboxed context. Because the handler does not adequately sanitize or neutralize special elements before passing them to an operating system shell, an attacker can inject additional commands. The result is arbitrary command execution outside the intended sandbox boundary.
The weakness is classified as Improper Neutralization of Special Elements used in an OS Command [CWE-78]. Impact on confidentiality and integrity is high, while availability is not directly affected according to the published vector.
Root Cause
The root cause is insufficient input validation and neutralization within the sandbox exec handler. User-supplied data is concatenated into a command string or passed to a shell interpreter without escaping shell metacharacters such as ;, |, &, $(), and backticks. This design flaw allows attacker-controlled input to alter the executed command line.
Attack Vector
The attack is executed over the network by an authenticated actor holding low privileges. Attack complexity is high, indicating the attacker must satisfy specific preconditions or influence sandbox state before injection succeeds. User interaction is not required. On success, the injected commands run in the process context of the sandbox exec handler.
No verified proof-of-concept code is publicly available. See the NVIDIA product-security advisory for vendor-supplied technical details.
Detection Methods for CVE-2026-65086
Indicators of Compromise
- Unexpected child processes spawned by the NVIDIA OpenShell sandbox exec handler, particularly shells such as /bin/sh, /bin/bash, or interpreters like python, perl, or curl.
- Sandbox exec handler log entries containing shell metacharacters (;, |, &&, $(, backticks) in argument fields.
- Outbound network connections initiated from the OpenShell process to previously unseen destinations.
Detection Strategies
- Monitor process ancestry for the OpenShell sandbox exec handler and alert on execution of shell interpreters or scripting runtimes as children.
- Deploy Linux auditd rules on execve syscalls to capture the full command line invoked by the handler and flag inputs containing metacharacters.
- Correlate handler activity with unexpected file writes under sensitive paths and with new outbound network sessions.
Monitoring Recommendations
- Enable verbose logging on the OpenShell sandbox exec handler and forward events to a centralized SIEM or data lake for retention and query.
- Baseline normal command patterns issued to the handler and alert on deviations, especially long argument strings or embedded shell syntax.
- Review authentication logs for the low-privileged accounts capable of invoking the handler and investigate anomalous session origins.
How to Mitigate CVE-2026-65086
Immediate Actions Required
- Apply the fixed release of NVIDIA OpenShell for Linux as documented in the NVIDIA Security Repository entry for advisory 5872.
- Restrict network reachability of the sandbox exec handler to trusted management networks and required service accounts.
- Rotate credentials for any low-privileged accounts authorized to invoke the handler if compromise is suspected.
Patch Information
Refer to the vendor advisory at the NVIDIA product-security repository for the fixed version and upgrade instructions. Additional record data is available on the CVE.org record for CVE-2026-65086.
Workarounds
- If patching is not immediately feasible, disable the sandbox exec handler feature or the OpenShell service on affected Linux hosts.
- Apply network access control lists to block untrusted sources from reaching the handler endpoint.
- Enforce least privilege for accounts that can submit commands to the handler and audit their activity continuously.
# Configuration example: restrict handler reachability with iptables
# Allow only a trusted management subnet to reach the OpenShell service port
iptables -A INPUT -p tcp --dport <openshell_port> -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport <openshell_port> -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
