CVE-2026-47618 Overview
CVE-2026-47618 is a server-side request forgery (SSRF) vulnerability in NVIDIA Dynamo for Linux. The flaw resides in the Rust multimodal media fetcher, which processes remote media references during inference workflows. An attacker can craft requests that coerce the fetcher into issuing outbound requests to attacker-chosen destinations, including internal services. Successful exploitation can lead to information disclosure from resources reachable by the Dynamo host. The vulnerability is classified under CWE-918: Server-Side Request Forgery and is exploitable over the network without authentication or user interaction.
Critical Impact
Unauthenticated attackers can trigger outbound requests from the Dynamo server to internal endpoints, potentially exposing metadata services, internal APIs, and other confidential resources.
Affected Products
- NVIDIA Dynamo for Linux (Rust multimodal media fetcher component)
Discovery Timeline
- 2026-08-04 - CVE-2026-47618 published to NVD
- 2026-08-06 - Last updated in NVD database
Technical Details for CVE-2026-47618
Vulnerability Analysis
The vulnerability affects the multimodal media fetcher within NVIDIA Dynamo, a component written in Rust that retrieves media assets referenced during multimodal model inference. The fetcher accepts URL inputs and issues outbound HTTP requests to retrieve the specified content. Because destination URLs are not sufficiently validated against an allowlist or restricted to expected external hosts, an attacker can submit crafted URLs that resolve to internal network addresses. This causes the Dynamo server to act as a proxy against its own trust boundary.
The primary consequence is information disclosure. Responses returned to the attacker or reflected in error paths may include data from internal management interfaces, cloud metadata endpoints such as 169.254.169.254, or other services that trust requests originating from the Dynamo host. The NVIDIA security notice for this issue tracks affected versions and fixed builds.
Root Cause
The root cause is insufficient validation of URLs supplied to the multimodal media fetcher. The fetcher trusts scheme, host, and IP values without enforcing egress restrictions or blocking private IP ranges, loopback addresses, and link-local ranges. DNS rebinding and redirect-following behavior may compound the issue if the fetcher follows redirects without re-validating targets.
Attack Vector
An attacker sends a request to the Dynamo inference API containing a multimodal payload referencing a controlled URL. The fetcher resolves and requests that URL from the server context, and the response or side effects reveal information about internal services. Refer to the NVIDIA product security repository for technical specifics.
// No verified proof-of-concept code is published for CVE-2026-47618.
// See the NVIDIA product security advisory for technical details.
Detection Methods for CVE-2026-47618
Indicators of Compromise
- Outbound HTTP requests from Dynamo hosts targeting private ranges such as 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, or the cloud metadata address 169.254.169.254.
- Inference API requests containing media URLs with IP literals, unusual schemes, or hostnames resolving to internal infrastructure.
- Elevated error rates from the multimodal media fetcher tied to unexpected destination hosts.
Detection Strategies
- Instrument the Dynamo host with egress logging and correlate outbound connections to originating API requests.
- Inspect application logs for fetcher activity tied to URLs referencing loopback, link-local, or RFC1918 ranges.
- Alert on any Dynamo process establishing a session with cloud instance metadata endpoints.
Monitoring Recommendations
- Forward Dynamo application logs and host network telemetry to a centralized analytics platform for correlation.
- Baseline normal outbound destinations for the media fetcher and alert on deviations.
- Track authentication token usage on internal APIs from the Dynamo host to detect abnormal access patterns.
How to Mitigate CVE-2026-47618
Immediate Actions Required
- Upgrade NVIDIA Dynamo to the fixed release referenced in the NVIDIA product security advisory.
- Restrict Dynamo host egress at the network layer to only the external destinations required for inference workloads.
- Block Dynamo host access to cloud metadata endpoints such as 169.254.169.254 and to internal management networks.
- Require authentication and rate limiting on the Dynamo inference API to reduce anonymous exploitation opportunities.
Patch Information
Apply the vendor-provided update tracked under NVIDIA advisory 5842. See the NVD entry for CVE-2026-47618 and the CVE.org record for the authoritative advisory list and updated version information.
Workarounds
- Deploy Dynamo behind an egress proxy that enforces an allowlist of permitted media hosts and denies private address ranges.
- Disable or restrict the multimodal media fetcher where remote media retrieval is not required.
- Use IMDSv2 or equivalent hardened metadata configurations on cloud instances hosting Dynamo to block token-less metadata access.
# Example iptables rules to block Dynamo host access to metadata and RFC1918 ranges
iptables -A OUTPUT -d 169.254.169.254 -j REJECT
iptables -A OUTPUT -d 10.0.0.0/8 -j REJECT
iptables -A OUTPUT -d 172.16.0.0/12 -j REJECT
iptables -A OUTPUT -d 192.168.0.0/16 -j REJECT
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
