🛡️ CVE-2026-45331
🟠 CVSS 8.5 — High ✅ No Known Exploit CWE-918 NVD
8.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, validate_url() in backend/open_webui/retrieval/web/utils.py calls validators.ipv6(ip, private=True), but the validators library does NOT implement the private keyword for IPv6 — the call raises a ValidationError (which is falsy in a boolean context), so every IPv6 address passes the filter. In addition, IPv4-mapped IPv6 (::ffff:10.0.0.1) bypasses the IPv4 check entirely, and several reserved IPv4 ranges (0.0.0.0/8, 100.64.0.0/10, 192.0.0.0/24, etc.) are not blocked. This vulnerability is fixed in 0.9.0.

Details

Severity HIGH
CVSS Score 8.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
CWE CWE-918
Public Exploit ✅ No
Source NVD
Published 2026-05-14
Updated 2026-06-15
Modified 2026-05-16
Fix URL N/A

Affected Packages

Software From version Fixed in
open-webui 0.9.0
unknown

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