CVE-2025-47273

A path traversal vulnerability in the Python setuptools library allows attackers with limited system access to write files outside the intended temporary directory by manipulating package download URLs. This flaw bypasses basic filename sanitization and can lead to unauthorized overwrites of important system files, creating opportunities for further compromise. While it doesn't expose data or require user interaction, it poses a high integrity risk and is especially concerning in environments that rely on automated package handling or internal tooling built on setuptools.

Red Hat Product Security has rated this vulnerability "Moderate" based on the impact of the damage caused by a successful exploitation and the pre-requisites.

• Exploitation requires that the attacker have limited code execution access to a Python environment where they can trigger the vulnerable PackageIndex.download() function—this might be via a script, plugin, or automated job. Full admin rights aren't needed but a user with no access at all will be unable to exploit this vulnerability.
• The vulnerability impacts the integrity of the system within the same security boundary—it does not enable access or compromise across trust boundaries (e.g., from one container to another or from user space to kernel).
• Successful exploitation only allows the attacker to "create" new files. The vulnerability does not provide access to existing files and by an extension to any confidential information.
• Arbitrary file writes can overwrite critical config files, executables, or scripts. This can lead to persistent code execution, system misconfiguration, or unauthorized behavior, especially in automated environments. While overwriting critical files could theoretically lead to service disruption, the vulnerability in isolation does not inherently cause denial of service. The exploit doesn't target availability directly, and in many cases, systems may continue running.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

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.