CVE-2026-70485

High

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.

SeverityHigh

CVSS7.1

Exploit probability—

ProductOpenwebui Open Webui

PublishedAug 4, 2026

First seenAug 4, 2026

Weakness typeCWE-918Server-side request forgery (SSRF)

How to fix

Update

openwebui open_webui0.11.0 or later
open-webui0.11.0 or later

Affected products

Product	Affected versions	Fixed in
openwebui open_webui	0.9.0 ≤ v < 0.11.0	0.11.0
open-webuiPyPI	0.9.0 ≤ v < 0.11.0	0.11.0

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