CVE-2026-17106
Description
A flaw was found in moby/go-archive. The tar extraction routines in the component do not properly restrict filesystem operations to the intended destination directory. An attacker who controls the contents of an archive can exploit this by including symbolic links, allowing them to create or overwrite files at arbitrary locations on the system where the archive is being extracted. This could lead to unauthorized modification of system files or potentially arbitrary code execution.
Statement
This Important severity vulnerability in moby/go-archive allows for arbitrary file writes during tar extraction. An attacker providing a specially crafted tar archive can exploit symlink following to create or overwrite files outside the intended directory, potentially leading to system compromise in environments processing untrusted archives, such as container build systems.
Mitigation
To mitigate this issue, avoid processing tar archives from untrusted sources. When handling archives from potentially untrusted origins, ensure that the extraction process is executed with the least privileges necessary to limit the impact of any arbitrary file write attempts.
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 | 7.8 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | Required | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | High | N/A | N/A |
| Integrity Impact | High | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Confidentiality,Integrity,Access Control
Technical Impact: Read Files or Directories; Modify Files or Directories; Bypass Protection Mechanism
An attacker may be able to traverse the file system to unintended locations and read or overwrite the contents of unexpected files. If the files are used for a security mechanism then an attacker may be able to bypass the mechanism.
Other
Technical Impact: Execute Unauthorized Code or Commands
Windows simple shortcuts, sometimes referred to as soft links, can be exploited remotely since a ".LNK" file can be uploaded like a normal file. This can enable remote execution.
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