CVE-2026-41479
Description
A flaw was found in Authlib, a Python library for building OAuth and OpenID Connect servers. A remote attacker can exploit the OAuth 2.0 authorization endpoint by providing an unsupported response type and a malicious redirect Uniform Resource Identifier (URI). This allows the attacker to redirect users to arbitrary external websites, potentially leading to information disclosure or phishing attacks. The vulnerability does not require authentication or a valid client registration.
Statement
Red Hat has assessed the impact of this vulnerability on Red Hat products. Products shipping Authlib 1.6.10 or later (1.6.x series) or 1.7.1 or later (1.7.x series) are not affected as they include the fix. Products shipping versions prior to 1.6.10 are affected at Moderate impact.
Mitigation
Upgrade Authlib to version 1.6.10 or later (for the 1.6.x series) or version 1.7.1 or later (for the 1.7.x series).
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.4 | N/A | 5.4 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | Required | N/A | Required |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
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