Description
ideon is a self-hosted visual workspace. Prior to version 0.9.4, validateUrlForSSRF() / safeFetch() in lib/oauth/ssrf-protection.ts (and the parallel validateMcpUrl() in lib/security/validators.ts) perform SSRF host-blocking by string/regex matching on new URL(url).hostname. Their IPv6 branch only recognises the textual forms ::1, fe80:/fc00:/fd00: prefixes, and the dotted-decimal IPv4-mapped form ::ffff:127.x. It does not recognise the WHATWG-canonical IPv4-mapped-IPv6 host that Node emits for a mapped address, which is hex-compressed and bracket-wrapped: [::ffff:7f00:1] for 127.0.0.1, [::ffff:a9fe:a9fe] for 169.254.169.254. An authenticated user who registers a STREAMABLE_HTTP / SSE MCP server with URL http://[::ffff:7f00:1]:PORT/ (loopback) or http://[::ffff:a9fe:a9fe]/ (cloud metadata) passes both guards, and the server-side OAuth-discovery action then fetches that host, yielding server-side request forgery to loopback and to the cloud metadata service. This issue has been patched in version 0.9.4.
Published: 2026-11-11
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
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History

Fri, 13 Nov 2026 07:00:00 +0000

Type Values Removed Values Added
First Time appeared 3xpyth0n
3xpyth0n ideon
Vendors & Products 3xpyth0n
3xpyth0n ideon

Wed, 11 Nov 2026 21:15:00 +0000

Type Values Removed Values Added
Description ideon is a self-hosted visual workspace. Prior to version 0.9.4, validateUrlForSSRF() / safeFetch() in lib/oauth/ssrf-protection.ts (and the parallel validateMcpUrl() in lib/security/validators.ts) perform SSRF host-blocking by string/regex matching on new URL(url).hostname. Their IPv6 branch only recognises the textual forms ::1, fe80:/fc00:/fd00: prefixes, and the dotted-decimal IPv4-mapped form ::ffff:127.x. It does not recognise the WHATWG-canonical IPv4-mapped-IPv6 host that Node emits for a mapped address, which is hex-compressed and bracket-wrapped: [::ffff:7f00:1] for 127.0.0.1, [::ffff:a9fe:a9fe] for 169.254.169.254. An authenticated user who registers a STREAMABLE_HTTP / SSE MCP server with URL http://[::ffff:7f00:1]:PORT/ (loopback) or http://[::ffff:a9fe:a9fe]/ (cloud metadata) passes both guards, and the server-side OAuth-discovery action then fetches that host, yielding server-side request forgery to loopback and to the cloud metadata service. This issue has been patched in version 0.9.4.
Title ideon: Unauthenticated SSRF in /api/proxy/image via WHATWG bracketed/hex-mapped IPv6 bypass of isSafeUrl guard
Weaknesses CWE-918
References
Metrics cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-11-13T00:05:44.376Z

Reserved: 2026-07-23T18:15:14.580Z

Link: CVE-2026-65968

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-11-11T21:16:46.563

Modified: 2026-11-13T02:18:58.140

Link: CVE-2026-65968

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-13T06:45:10Z

Weaknesses
  • CWE-918

    Server-Side Request Forgery (SSRF)