CVE-2026-70485 json
Open WebUI: Any authenticated user can reach internal services and cloud metadata via NAT64-encoded URLs
published 2026-08-04 3 mo ago modified 2026-09-18 51 d ago also GHSA-8x5v-cpv7-8jjp , PYSEC-2026-3645 , EUVD-2026-52890
- cvss
- 7.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 28%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi open-webui 0.11.0
- openwebui open_webui 0.11.0
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/open-webui/open-webui/security/advisories/GHSA-8x5v-cpv7-8jjp referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N |
| OSV | 3.1 | 7.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N |
| GitHub | 3.1 | 7.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | open-webui | >=0.9.0, <0.11.0 |
0.11.0 |
Affected products
- open-webui open-webui
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/open-webui/open-webui/commit/1717b493d83c86afa82aa8bc50139250852dd2f3
web, patch
-
github.com
/open-webui/open-webui/security/advisories/GHSA-8x5v-cpv7-8jjp
exploit, web, vendor-advisory
-
github.com
/open-webui/open-webui/releases/tag/v0.11.0
web, release-notes
-
github.com
/open-webui/open-webui
package
-
pypi.org
/project/open-webui
package
-
github.com
/advisories/GHSA-8x5v-cpv7-8jjp
advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-70485
advisory
Sources
- CVE List CVE-2026-70485
- GitHub Advisory GHSA-8x5v-cpv7-8jjp
- NVD CVE-2026-70485
- OSV PYSEC-2026-3645
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.