CVE-2026-65124: NVIDIA Infrastructure Controller XXE Vulnerability

CVE-2026-65124 Overview

CVE-2026-65124 is an XML injection vulnerability affecting NVIDIA Infrastructure Controller for Linux. An authenticated attacker with high privileges can inject crafted XML content that the controller processes without adequate validation. Successful exploitation can lead to data tampering and denial of service on the affected system.

The issue is categorized under [CWE-91] (XML Injection, also known as Blind XPath Injection). While the vulnerability requires high privileges and high attack complexity, it enables an attacker to compromise integrity and availability of the controller. NVIDIA published advisory details for this issue in September 2026.

Critical Impact
An authenticated attacker can tamper with data processed by NVIDIA Infrastructure Controller for Linux and cause denial of service through crafted XML input.

Affected Products

NVIDIA Infrastructure Controller for Linux
Specific affected versions: refer to the NVIDIA product security advisory
CPE identifiers: Not Available in NVD at time of publication

Discovery Timeline

2026-09-22 - CVE CVE-2026-65124 published to NVD
2026-09-22 - Last updated in NVD database

Technical Details for CVE-2026-65124

Vulnerability Analysis

The vulnerability resides in how NVIDIA Infrastructure Controller for Linux parses or constructs XML documents. An attacker who supplies attacker-controlled data into an XML context can alter the document structure, insert new elements, or manipulate existing values. This class of flaw is tracked as [CWE-91] XML Injection.

Exploitation requires network access and existing high-privilege credentials on the controller. The scope remains unchanged, meaning the impact is limited to the vulnerable component itself. Confidentiality is not affected, but both integrity and availability can be compromised through successful injection.

Because the controller manages infrastructure workloads, tampering with XML-driven configuration or command flows can propagate into downstream systems. A denial-of-service outcome is also possible when malformed XML disrupts parser state or triggers unhandled exceptions in processing pipelines.

Root Cause

The root cause is missing or inadequate sanitization of untrusted input before it is incorporated into XML documents processed by the controller. Special XML metacharacters such as <, >, &, and quote characters are not properly escaped or validated, allowing injected content to be interpreted as XML markup rather than data.

Attack Vector

The attack vector is network-based. An authenticated user with high privileges submits crafted input to a controller interface that later serializes or processes the input as XML. The injected payload alters the XML document semantics, producing tampered configuration or malformed output that halts processing.

No verified public proof-of-concept code is available. Refer to the NVIDIA product security advisory for vendor-provided technical detail.

Detection Methods for CVE-2026-65124

Indicators of Compromise

Unexpected XML parsing errors or malformed document exceptions logged by NVIDIA Infrastructure Controller services.
Configuration objects containing unexpected XML elements, duplicated tags, or attribute values inconsistent with administrator intent.
Sudden restarts, hangs, or crash loops of the controller process following administrative API calls.

Detection Strategies

Audit controller API and management interface logs for requests containing XML metacharacters such as <, >, &, or CDATA sequences in unexpected fields.
Correlate authenticated administrative sessions with subsequent XML parser errors or service instability.
Compare configuration snapshots before and after privileged operations to identify tampered elements.

Monitoring Recommendations

Forward controller application logs and system logs to a centralized analytics platform for continuous review.
Alert on repeated XML parsing failures or process crashes originating from the NVIDIA Infrastructure Controller service.
Track privileged account activity against the controller and flag deviations from normal administrative baselines.

How to Mitigate CVE-2026-65124

Immediate Actions Required

Apply the fixed version referenced in the NVIDIA product security advisory as soon as it is available for your deployment.
Restrict administrative access to the controller to a minimal set of trusted operators and enforce multi-factor authentication.
Rotate credentials for any high-privilege accounts that could reach the affected controller interfaces.

Patch Information

NVIDIA has published advisory information for CVE-2026-65124 through its product-security repository. Consult the NVIDIA product security advisory, the NVD entry for CVE-2026-65124, and the CVE.org record for fixed version details and installation guidance.

Workarounds

Place the controller management interface behind network segmentation and allow access only from trusted management subnets.
Limit high-privilege role assignments and audit existing role grants to reduce the population of accounts capable of exploiting the flaw.
Increase logging verbosity around administrative operations to shorten detection time until the patch is deployed.

bash

# Example: restrict controller management port to a trusted management subnet
sudo iptables -A INPUT -p tcp --dport <controller_mgmt_port> -s 10.10.20.0/24 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport <controller_mgmt_port> -j DROP