CVE-2026-45331
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
open-webuiPyPI | < 0.9.0 | 0.9.0 |
Affected products
2<= 0.8.12+ 1 more
- (no CPE)range: <= 0.8.12
- cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*range: <0.9.0
Patches
Vulnerability mechanics
References
5- github.com/open-webui/open-webui/security/advisories/GHSA-4v7r-f4w8-8972nvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-4v7r-f4w8-8972ghsaADVISORY
- github.com/advisories/GHSA-c6xv-rcvw-v685ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-45331ghsaADVISORY
- github.com/open-webui/open-webui/releases/tag/v0.9.0ghsaWEB
News mentions
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