draw.io: SSRF via DNS rebinding in ProxyServlet bypasses private IP blocklist

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-63334
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-21 17:17:39 UTC
Updated2026-09-23 18:26:49 UTC
Descriptiondraw.io is a configurable diagramming and whiteboarding application. Prior to version 30.2.7, deployments with ENABLE_DRAWIO_PROXY=1 are vulnerable to server-side request forgery because src/main/java/com/mxgraph/online/Utils.java performs the private-address check in Utils.sanitizeUrl() using one DNS resolution, while src/main/java/com/mxgraph/online/ProxyServlet.java later calls URL.openConnection() and performs a second resolution. An attacker-controlled hostname can resolve to a public address during validation and then to a private, link-local, or cloud metadata address when the connection is opened. Successful exploitation can return cloud instance metadata or responses from internal HTTP services through the proxy. This issue is fixed in version 30.2.7.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS: 0.003150000 probability, percentile 0.217100000 (date 2026-09-24)

Problem Types: CWE-367 | CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF) | CWE-367 CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Jgraph Drawio affected < 30.2.7 Not specified

References

ReferenceSourceLinkTags
github.com/jgraph/drawio/releases/tag/v30.2.7 [email protected] github.com
github.com/jgraph/drawio/security/advisories/GHSA-3v4h-8r2c-m8c5 [email protected] github.com
github.com/jgraph/drawio/commit/650fbd742814f6502f78248dc2d8e2aaa5e42b5e [email protected] github.com
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