CVE-2026-24231: NVIDIA NemoClaw SSRF Vulnerability

CVE-2026-24231 Overview

NVIDIA NemoClaw contains a Server-Side Request Forgery (SSRF) vulnerability in the validateEndpointUrl() SSRF protection component. An attacker could exploit this flaw by supplying a crafted endpoint URL referencing the 0.0.0.0/8 address range through a blueprint configuration file or CLI flag. This vulnerability allows attackers to bypass intended URL validation controls, potentially enabling unauthorized access to internal network resources and sensitive information disclosure.

Critical Impact

Successful exploitation of this vulnerability may lead to information disclosure through unauthorized server-side requests to internal network resources.

Affected Products

• NVIDIA NemoClaw (specific versions not disclosed)

Discovery Timeline

• 2026-04-28 - CVE CVE-2026-24231 published to NVD
• 2026-04-28 - Last updated in NVD database

Technical Details for CVE-2026-24231

Vulnerability Analysis

This Server-Side Request Forgery (SSRF) vulnerability exists within the validateEndpointUrl() function, which is designed to prevent SSRF attacks by validating user-supplied endpoint URLs. The validation logic fails to properly handle the 0.0.0.0/8 address range, which represents "this network" in IPv4 addressing. When an attacker supplies a URL containing an address within this range through either a blueprint configuration file or a command-line flag, the validation is bypassed, allowing the server to make requests to unintended destinations.

The vulnerability is classified under CWE-918 (Server-Side Request Forgery), indicating a failure to properly restrict network requests based on user input. This flaw requires local access and user interaction to exploit, as the malicious URL must be introduced through configuration files or CLI parameters.

Root Cause

The root cause of this vulnerability lies in incomplete input validation within the validateEndpointUrl() function. The SSRF protection mechanism does not adequately block or sanitize URLs containing the 0.0.0.0/8 address range. This oversight allows attackers to craft URLs that appear legitimate to the validator but actually target internal network resources or localhost services when processed by the application.

The 0.0.0.0/8 range is particularly dangerous because addresses within this block (such as 0.0.0.0) can be interpreted as referring to "all addresses" or the local host on many systems, enabling access to internal services that should be protected from external requests.

Attack Vector

The attack requires local access to the system running NVIDIA NemoClaw. An attacker must have the ability to modify blueprint configuration files or supply command-line arguments to the application. The attack flow involves:

1. The attacker creates or modifies a blueprint configuration file containing a malicious endpoint URL using an address from the 0.0.0.0/8 range
2. Alternatively, the attacker supplies the crafted URL via CLI flags when launching the application
3. When the application processes this URL, the validateEndpointUrl() function fails to identify the address as internal/restricted
4. The application makes a server-side request to the attacker-specified internal resource
5. Sensitive information from the internal resource is disclosed to the attacker

The vulnerability mechanism involves bypassing URL validation by exploiting improper handling of the 0.0.0.0/8 address range in the validateEndpointUrl() function. Technical implementation details can be found in the NVIDIA Support Answer.

Detection Methods for CVE-2026-24231

Indicators of Compromise

• Unusual network requests originating from NemoClaw processes to internal IP addresses or localhost services
• Configuration files containing URLs with addresses in the 0.0.0.0/8 range (e.g., 0.0.0.0, 0.255.255.255)
• Application logs showing endpoint connections to unexpected internal resources
• Command-line arguments containing suspicious endpoint URLs with zero-prefix IP addresses

Detection Strategies

• Monitor NemoClaw configuration files for URLs containing IP addresses in the 0.0.0.0/8 range
• Implement network monitoring to detect server-side requests from NemoClaw to internal network segments
• Review application startup logs and command-line arguments for malicious endpoint URLs
• Deploy file integrity monitoring on blueprint configuration files to detect unauthorized modifications

Monitoring Recommendations

• Enable verbose logging for the validateEndpointUrl() component to capture URL validation attempts
• Configure network security tools to alert on outbound connections from NemoClaw to internal IP ranges
• Implement centralized log collection for correlation of suspicious URL validation bypass attempts
• Set up alerts for configuration file changes in NemoClaw deployment directories

How to Mitigate CVE-2026-24231

Immediate Actions Required

• Review all existing NemoClaw blueprint configuration files for URLs containing 0.0.0.0/8 addresses
• Restrict access to configuration files and CLI execution to trusted administrators only
• Implement network segmentation to limit the impact of potential SSRF exploitation
• Apply the vendor security patch when available from NVIDIA

Patch Information

NVIDIA has released security guidance for this vulnerability. Organizations should consult the NVIDIA Support Answer for official patch information and updated software versions. Additional details are available in the NVD CVE-2026-24231 Details.

Workarounds

• Implement additional network-level controls to block requests to 0.0.0.0/8 addresses from NemoClaw processes
• Use network firewalls to restrict outbound connections from systems running NemoClaw
• Apply strict file permission controls on configuration files to prevent unauthorized modification
• Consider running NemoClaw in an isolated network environment until patches are applied

# Example: Network-level mitigation using iptables to block 0.0.0.0/8 SSRF attempts
# Block outbound connections to 0.0.0.0/8 range from NemoClaw processes
iptables -A OUTPUT -d 0.0.0.0/8 -m owner --uid-owner nemoclaw -j DROP

# Log attempted connections for detection purposes
iptables -A OUTPUT -d 0.0.0.0/8 -m owner --uid-owner nemoclaw -j LOG --log-prefix "NEMOCLAW-SSRF-ATTEMPT: "