File Extraction Vulnerability in Moby's Archive Routines

CVE-2026-17106

What is CVE-2026-17106?

CVE-2026-17106 is a vulnerability affecting Moby's archive routines, specifically within the moby/go-archive library. This library is integral for container management, facilitating functions like file extraction from archive formats. The vulnerability arises from the tar extraction routines, which fail to limit filesystem operations to the intended destination directory. Instead, the extractor allows the determination of file placement based on lexical checks and subsequently operates within the filesystem paths as resolved by the operating system. Consequently, an attacker who can manipulate the content of an archive can potentially create or overwrite files in arbitrary paths that are writable by the process executing the extraction. This flaw poses significant risks to organizations that rely on Moby for containerization and orchestration tasks, as it opens pathways for unauthorized file manipulations and data breaches.

Potential impact of CVE-2026-17106

1. Unauthorized File Manipulation: The vulnerability allows attackers to write or overwrite files outside of designated directories, which can lead to unauthorized changes in system configurations and potentially exploit further vulnerabilities in the system.

2. Data Breach Risks: By leveraging this vulnerability, malicious actors may gain access to sensitive information or core system files, increasing the risk of data exfiltration and compromising the integrity of critical organizational data.

3. Increased Attack Surface: With the potential for file manipulation beyond intended boundaries, the current security models in place may be rendered ineffective, thereby amplifying the overall risk posed to systems using Moby and leading to possible cascading vulnerabilities within the IT environment.

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