CVE-2026-47616: NVIDIA Dynamo for Linux SSRF Vulnerability

CVE-2026-47616 Overview

CVE-2026-47616 is a Server-Side Request Forgery (SSRF) vulnerability [CWE-918] in NVIDIA Dynamo for Linux. The flaw resides in the multimodal media fetcher component, which processes remote media URLs on behalf of the server. An unauthenticated attacker can craft a request that forces the server to issue arbitrary outbound HTTP requests. Successful exploitation may lead to information disclosure, including access to internal services, cloud metadata endpoints, and other network resources reachable from the Dynamo host.

Critical Impact
Remote, unauthenticated attackers can coerce the Dynamo server into making arbitrary internal requests, exposing confidential data reachable from the server's network position.

Affected Products

NVIDIA Dynamo for Linux (multimodal media fetcher component)
Refer to the NVIDIA Product Security Advisory for specific affected versions
Deployments exposing the Dynamo media fetcher endpoint to untrusted networks

Discovery Timeline

2026-08-04 - CVE-2026-47616 published to NVD
2026-08-06 - Last updated in NVD database

Technical Details for CVE-2026-47616

Vulnerability Analysis

The vulnerability affects NVIDIA Dynamo's multimodal media fetcher, a component that retrieves external media assets referenced by client requests. The fetcher accepts a user-supplied URL and issues an HTTP request from the server to that destination. Insufficient validation of the target URL allows attackers to redirect the request to arbitrary hosts, including internal-only services.

The issue is classified under CWE-918: Server-Side Request Forgery. Because the fetcher runs with the network trust context of the Dynamo server, attackers can reach services normally protected by network segmentation. Impacted targets include cloud instance metadata services, internal APIs, health endpoints, and administrative interfaces bound to loopback addresses.

The CVE record indicates the impact is limited to confidentiality. Integrity and availability are not directly affected, but disclosed data (credentials, tokens, configuration) frequently enables follow-on attacks.

Root Cause

The root cause is missing or insufficient validation of destination URLs supplied to the media fetcher. The component does not enforce an allowlist of trusted external domains, does not block requests to private IP ranges (RFC 1918, loopback, link-local), and does not restrict URL schemes to safe protocols before dispatching the request.

Attack Vector

Exploitation requires network reachability to the Dynamo service and no authentication. An attacker submits a media fetch request with a URL pointing to an internal resource. The server resolves the URL and returns the response, response metadata, or error signals to the attacker. Typical SSRF targets include http://169.254.169.254/ for cloud metadata, http://127.0.0.1/ for local administrative services, and internal hostnames only reachable from the Dynamo network.

No public exploit code has been released for CVE-2026-47616 at the time of writing. See the NVIDIA advisory for vendor-provided technical details.

Detection Methods for CVE-2026-47616

Indicators of Compromise

Outbound HTTP requests from the Dynamo host to cloud metadata endpoints such as 169.254.169.254 or metadata.google.internal
Media fetcher log entries containing URLs pointing to 127.0.0.1, localhost, or private IP ranges
Unexpected requests from the Dynamo service account to internal administrative endpoints
Spikes in outbound connections initiated by the multimodal fetcher process

Detection Strategies

Parse Dynamo access logs for media fetcher requests with URL parameters resolving to non-public address space
Correlate egress traffic from Dynamo hosts against a baseline of expected media CDN destinations
Alert on any request from Dynamo pods to cloud metadata IPs at the network policy or eBPF layer
Deploy Web Application Firewall rules that inspect fetcher parameters for SSRF payload patterns

Monitoring Recommendations

Enable verbose logging on the multimodal media fetcher, including full destination URLs and response codes
Forward Dynamo and host network telemetry to a centralized data lake for retrospective hunting
Monitor DNS queries originating from Dynamo hosts for lookups against internal or metadata hostnames
Track process-level network connections on Dynamo servers to identify fetcher requests bypassing expected proxies

How to Mitigate CVE-2026-47616

Immediate Actions Required

Apply the vendor patch referenced in the NVIDIA product security repository as soon as it is available for your version
Restrict network access to the Dynamo API so only trusted clients can submit media fetch requests
Block outbound egress from Dynamo hosts to cloud metadata endpoints and internal management ranges at the network layer
Rotate any credentials or tokens that may have been reachable via SSRF from the Dynamo host

Patch Information

NVIDIA has published advisory details in its product-security repository. Administrators should consult the advisory for fixed version numbers and upgrade instructions. Full CVE details are available at the NVD entry for CVE-2026-47616 and the CVE.org record.

Workarounds

Deploy an egress proxy that enforces an allowlist of approved external media domains for the Dynamo service
Use network policies or host firewall rules to deny outbound connections from Dynamo to RFC 1918, loopback, and link-local ranges
Require IMDSv2 (or equivalent hardened metadata access) on cloud instances hosting Dynamo to defeat basic SSRF against metadata services
Place Dynamo in a segmented network with no route to sensitive internal services

bash

# Example: block Dynamo host egress to cloud metadata and private ranges
iptables -A OUTPUT -m owner --uid-owner dynamo -d 169.254.169.254 -j DROP
iptables -A OUTPUT -m owner --uid-owner dynamo -d 10.0.0.0/8 -j DROP
iptables -A OUTPUT -m owner --uid-owner dynamo -d 172.16.0.0/12 -j DROP
iptables -A OUTPUT -m owner --uid-owner dynamo -d 192.168.0.0/16 -j DROP
iptables -A OUTPUT -m owner --uid-owner dynamo -d 127.0.0.0/8 -j DROP