CVE-2025-50182
Description
A flaw was found in urllib3. The library fails to properly validate redirect URLs, allowing an attacker to manipulate redirect chains when used in environments like Pyodide utilizing the JavaScript Fetch API. This lack of validation can enable a remote attacker to control the redirect destination, leading to arbitrary URL redirection. Consequently, an attacker can redirect users to malicious websites. This vulnerability stems from a failure to constrain the redirect target.
Statement
The vulnerability lies in the urllib3 library's inability to control HTTP redirects when executed within a Pyodide runtime. This can lead to Server-Side Request Forgery (SSRF) attacks, where an attacker can induce the application to make requests to unintended internal or external resources. While urllib3 is a ubiquitous library in the Python ecosystem and is present in many Red Hat products, the vulnerability is specific to its use within the less common Pyodide (Python in a browser) environment. The attack complexity is high as it requires a specific application context where user-supplied input is used to construct a request URL in a Pyodide-based application that also attempts to mitigate SSRF by disabling redirects. The impact is primarily on confidentiality, as a successful exploit could lead to the disclosure of sensitive information from the server's local network. Given the specific and less common configuration required for exploitation, the severity is rated as Moderate.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | 6.1 | 5.3 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | High | Low | High |
| Privileges Required | Low | None | Low |
| User Interaction | None | Required | None |
| Scope | Unchanged | Changed | Unchanged |
| Confidentiality | High | Low | High |
| Integrity Impact | None | Low | None |
| Availability Impact | None | None | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
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