CVE-2026-97373

Received Received - Intake

draw.io SSRF via Incomplete Proxy Endpoint Blocklist

Publication date: 2026-11-04

Last updated on: 2026-11-04

Assigner: GitHub, Inc.

Description

draw.io is a configurable diagramming and whiteboarding application. Prior to 30.3.8, the optional /proxy endpoint contains an incomplete server-side request forgery blocklist. When the endpoint is enabled, the URL validator does not reject the RFC 6598 shared address range 100.64.0.0/10. An unauthenticated remote attacker can cause the draw.io server to request internal services that are reachable in this range, potentially disclosing data from Carrier-Grade NAT, Kubernetes, cloud, or overlay-network addresses. This vulnerability is fixed in 30.3.8.

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Meta Information

Published

2026-11-04

Last Modified

2026-11-04

Generated

2026-11-05

AI Q&A

2026-11-05

EPSS Evaluated

N/A

NVD

CVE-2026-97373

EUVD

EUVD-2026-117101

Affected Vendors & Products

Vendor	Product	Version / Range
jgraph	drawio	< 30.3.8

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-918	The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

Executive Summary

This is a Server-Side Request Forgery (SSRF) vulnerability in draw.io versions before 30.3.8. The /proxy endpoint has an incomplete blocklist for private IP ranges. It fails to block the RFC 6598 Carrier-Grade NAT range 100.64.0.0/10, allowing attackers to send requests to internal services within this range. The vulnerability enables unauthenticated access to internal network services like Kubernetes pods or cloud endpoints.

Detection Guidance

Check if the draw.io server is running a vulnerable version (29.6.4 or earlier) by inspecting the application version. Verify if the /proxy endpoint is enabled by checking environment variables like ENABLE_DRAWIO_PROXY=1. Monitor network traffic for requests to the 100.64.0.0/10 range via logs or packet inspection tools like tcpdump or Wireshark.

Impact Analysis

An attacker could exploit this to access internal services in your network, potentially exposing sensitive data from Kubernetes pods, cloud services, or overlay networks. This could lead to data breaches, unauthorized access to internal APIs, or further network compromise if internal services are vulnerable.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection requirements or HIPAA's safeguards for protected health information. Organizations using affected draw.io versions may face compliance violations if internal data is exposed due to this SSRF flaw.

Mitigation Strategies

Upgrade draw.io to version 30.3.8 or later to apply the SSRF protection fixes. Disable the /proxy endpoint if not required by setting ENABLE_DRAWIO_PROXY=0. Add the 100.64.0.0/10 range to the SSRF blocklist if using a custom configuration. Implement structured subnet checks instead of string-based blocklists for broader coverage.

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