# CVE-2026-41479: python-authlib: Authlib is a Python library which builds OAuth and OpenID Connect servers

CVE-2026-41479 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-41479, released June 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-41479
- Priority: Routine
- CVSS: 5.4 (medium)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 22, 2026

## Description

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.10 and 1.7.1, Authlib's OAuth 2.0 authorization endpoint can be turned into an unauthenticated open redirect when a request uses an unsupported response_type and supplies an attacker-controlled redirect_uri. The vulnerable behavior happens before client lookup and before any redirect URI validation. As a result, an attacker does not need a valid client registration, an authenticated user, or any prior state. A single request to the authorization endpoint is enough to obtain a 302 Location response to an arbitrary attacker-controlled URL. This vulnerability is fixed in 1.6.10 and 1.7.1.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-Authlib opensuse-leap 16.0 | 1.5.2-bp160.4.1 | [OPENSUSE-SU-2026:21795-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21795-1.md) | Sep 3, 2026 |
| Linux | python-Authlib sles 15.7 | 1.3.1-150600.3.30.1 | [SUSE-SU-2026:4111-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4111-1.md) | Sep 9, 2026 |
| Linux | python-authlib Debian 14 | 1.7.2-1 | [DEBIAN-CVE-2026-41479](https://patchblox.com/security/data/fix/linux/debian-cve-2026-41479.md) | Jun 24, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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