External risk intelligence

NVIDIA NeMo Agent Toolkit Missing Authentication Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 10.0)

CVE-2026-65145

NVIDIA NeMo Agent Toolkit is used to build AI agents and web-accessible applications. These tools are commonly deployed as network-accessible APIs, web services, or endpoints to facilitate interaction, making them reachable in common real-world deployment patterns.

Missing Authentication

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in the NVIDIA NeMo Agent Toolkit, a framework used for developing AI-powered agents and applications. This issue could potentially allow unauthorized access, leading to serious consequences such as code execution, privilege escalation, data manipulation, service disruption, or information breaches. The main concern at this stage is to confirm if this technology is in use within our environment.

Authentication is missing in the toolkit.
Impacts AI agents and web applications.
Confirm relevance and exposure across our systems.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by reaching the NVIDIA NeMo Agent Toolkit over a network without needing any credentials. This exposure allows them to interact with the system in a way that bypasses security checks, potentially leading to serious consequences.

No authentication required for access.
Missing authentication allows triggering the vulnerability.
Code execution and data tampering are possible.

Live Threat

Current exploitation, exposure, and threat context

The NVIDIA NeMo Agent Toolkit is susceptible to a missing authentication vulnerability, which, when exploited, could allow an attacker to execute code, escalate privileges, tamper with data, cause a denial of service, or disclose sensitive information. This could affect system data and service behavior when the toolkit is deployed in network-accessible configurations.

System data and service behavior.
Unauthorized network access.
Code execution and privilege escalation.

Operational Fix

Recommended remediation, mitigation, and detection steps

The NVIDIA NeMo Agent Toolkit vulnerability requires immediate attention from teams managing AI development platforms and their associated infrastructure. The first step is to identify all instances of the affected toolkit, assess their network exposure and business criticality, and then determine the accountable owner for remediation planning.

Identify and confirm affected systems.
Verify network reachability and business impact.
Plan remediation based on identified 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.

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Frequently asked questions

What is the NVIDIA NeMo Agent Toolkit?

The NVIDIA NeMo Agent Toolkit is a software framework designed for developers to build, customize, and deploy AI-powered agents. It provides the essential infrastructure and tools needed to create applications capable of reasoning and executing tasks autonomously. It is frequently used to construct sophisticated AI systems that interact through network-accessible interfaces, such as APIs or web-based services.

What does CVE-2026-65145 mean?

This CVE represents a security weakness classified as CWE-306, which is a Missing Authentication for Critical Function vulnerability. Essentially, the software fails to verify who a user is before allowing them to access sensitive operations. Because this security gate is absent, an unauthorized party can interact with the toolkit as if they were a legitimate user, potentially gaining deep control over the system's functions.

How can an attacker trigger this vulnerability?

An attacker triggers this flaw by interacting with the affected toolkit directly over a network without needing to provide any login credentials or security tokens. It is important to note that this bug is specifically tied to the absence of access control; standard, authorized interactions with a properly secured agent should not trigger this issue, as the flaw relies entirely on the system's failure to enforce a login requirement.

Is my system at risk if it uses this toolkit?

According to Halo Surface Signal, this vulnerability is most relevant for deployments where the toolkit serves as a network-accessible API or web endpoint. Because these tools are often designed to facilitate remote interactions, they are frequently reachable by outside parties. If your instance is exposed to a network, the risk is higher, whereas isolated systems that do not accept external traffic face a reduced immediate threat profile.

What steps should I take if I run this software?

Your priority is to conduct an inventory to locate all instances of the toolkit within your environment. Once identified, evaluate whether these instances are reachable over a network and determine their business function. After confirming the presence of the toolkit, identify the team responsible for managing these services so they can prioritize security updates or configuration changes once they become available.

References

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.