CVE-2026-4360
Description
A flaw was found in the Python Tarfile.extract() function. This vulnerability occurs when processing untrusted tar files containing hardlinks, as the filter parameter is not correctly enforced. An attacker could exploit this to write files with unintended user or group ownership, potentially leading to unauthorized modifications or privilege issues on the system.
Statement
This Moderate flaw in Python's Tarfile module allows a local attacker with low privileges to achieve a high integrity impact. By tricking a user into extracting a specially crafted untrusted tar file containing hardlinks, the attacker could cause files to be written with unexpected ownership, potentially leading to unauthorized file modification.
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 | 5.3 | N/A |
| Attack Vector | Local | Network | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | None | N/A |
| User Interaction | Required | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | High | Low | N/A |
| Availability Impact | None | None | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Understanding the Weakness (CWE)
Confidentiality,Integrity
Technical Impact: Read Application Data; Modify Application Data
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