# CVE-2026-65968: ideon: Unauthenticated SSRF in /api/proxy/image via WHATWG bracketed/hex-mapped IPv6 bypass of isSafeUrl guard

Status: published. Published: 2026-11-11. Updated: 2026-11-13.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- 3xpyth0n / ideon: < 0.9.4 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); 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; source: CNA: GitHub_M

- CVSS 4.0: 5.3 (medium); 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: 0.31% as of 2026-11-12; percentile 24.29%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-918

## Exploit evidence

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

## References

- https://github.com/3xpyth0n/ideon/security/advisories/GHSA-cvcr-fcf6-366r (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/3xpyth0n/ideon/commit/58e2f26bb7259d24c963a753962ac34f56c63b01 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/3xpyth0n/ideon/releases/tag/v0.9.4 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/3xpyth0n/ideon/commit/58e2f26bb7259d24c963a753962ac34f56c63b01 (security-advisories@github.com)

- https://github.com/3xpyth0n/ideon/releases/tag/v0.9.4 (security-advisories@github.com)

- https://github.com/3xpyth0n/ideon/security/advisories/GHSA-cvcr-fcf6-366r (security-advisories@github.com)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-65968; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-65968; retrieved 2026-11-13; source updated 2026-11-12

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-65968; retrieved 2026-11-13; source updated Not reported

Revision: e5125e3e6bffb56fa6f64c9b9773efddacdb2955ff293bfb570b7203b468b7a6

Canonical: https://y2.dev/cve/CVE-2026-65968

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