The validators.ipv6(ip, private=True) call always returns a falsy ValidationError because validators==0.35.0 does not support the private kwarg for IPv6. This means any hostname resolving to a private IPv6 address (::1, fd00::*, ::ffff:169.254.169.254) bypasses SSRF protection entirely, circumventing the fix for CVE-2025-65958.
Replace both the IPv4 and IPv6 validators-based private checks with Python's stdlib ipaddress module, which correctly handles is_private, is_loopback, is_link_local, and is_reserved for both address families, including IPv4-mapped IPv6 addresses.
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## 📋 Pull Request Information
**Original PR:** https://github.com/open-webui/open-webui/pull/23453
**Author:** [@Classic298](https://github.com/Classic298)
**Created:** 4/6/2026
**Status:** ✅ Merged
**Merged:** 4/12/2026
**Merged by:** [@tjbck](https://github.com/tjbck)
**Base:** `dev` ← **Head:** `fix/ipv6-ssrf-protection-bypass`
---
### 📝 Commits (1)
- [`7094edb`](https://github.com/open-webui/open-webui/commit/7094edb54d0bff2755fa0bd7c659368e9fb318d7) fix: use ipaddress stdlib for IPv6 SSRF protection
### 📊 Changes
**1 file changed** (+4 additions, -5 deletions)
<details>
<summary>View changed files</summary>
📝 `backend/open_webui/retrieval/web/utils.py` (+4 -5)
</details>
### 📄 Description
The validators.ipv6(ip, private=True) call always returns a falsy ValidationError because validators==0.35.0 does not support the private kwarg for IPv6. This means any hostname resolving to a private IPv6 address (::1, fd00::*, ::ffff:169.254.169.254) bypasses SSRF protection entirely, circumventing the fix for CVE-2025-65958.
Replace both the IPv4 and IPv6 validators-based private checks with Python's stdlib ipaddress module, which correctly handles is_private, is_loopback, is_link_local, and is_reserved for both address families, including IPv4-mapped IPv6 addresses.
### Contributor License Agreement
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- [X] By submitting this pull request, I confirm that I have read and fully agree to the [Contributor License Agreement (CLA)](https://github.com/open-webui/open-webui/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT), and I am providing my contributions under its terms.
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---
<sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>
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📋 Pull Request Information
Original PR: https://github.com/open-webui/open-webui/pull/23453
Author: @Classic298
Created: 4/6/2026
Status: ✅ Merged
Merged: 4/12/2026
Merged by: @tjbck
Base:
dev← Head:fix/ipv6-ssrf-protection-bypass📝 Commits (1)
7094edbfix: use ipaddress stdlib for IPv6 SSRF protection📊 Changes
1 file changed (+4 additions, -5 deletions)
View changed files
📝
backend/open_webui/retrieval/web/utils.py(+4 -5)📄 Description
The validators.ipv6(ip, private=True) call always returns a falsy ValidationError because validators==0.35.0 does not support the private kwarg for IPv6. This means any hostname resolving to a private IPv6 address (::1, fd00::*, ::ffff:169.254.169.254) bypasses SSRF protection entirely, circumventing the fix for CVE-2025-65958.
Replace both the IPv4 and IPv6 validators-based private checks with Python's stdlib ipaddress module, which correctly handles is_private, is_loopback, is_link_local, and is_reserved for both address families, including IPv4-mapped IPv6 addresses.
Contributor License Agreement
🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.