# CVE-2026-97373: draw.io: Incomplete SSRF blocklist in `ProxyServlet` / `Utils.sanitizeUrl`: RFC 6598 CGNAT range `100.64.0.0/10` is not blocked -> server-side request to internal CGNAT hosts

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- jgraph / drawio: < 30.3.8 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 5.8 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-918

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/jgraph/drawio/security/advisories/GHSA-xc39-mcq4-fr4q (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/jgraph/drawio/commit/73c4a91196246bbdb60f52b15871e82006b7972d (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-97373; retrieved 2026-11-04; source updated 2026-11-04

Revision: b90e33de6f39e51be1d2aa88ef702e3b4a33cdc3b44acfb00468e96614c2dab8

Canonical: https://y2.dev/cve/CVE-2026-97373

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