CVE-2026-20613 is a directory traversal vulnerability classified under CWE-22 found in the ArchiveReader.extractContents() function of Apple's Container product. This function is invoked by commands such as cctl image load and container image load to extract container images from archives. The vulnerability arises because the function does not perform any pathname validation on archive members before extraction. Consequently, a maliciously crafted archive can include relative pathnames (e.g., '../') that cause files to be extracted outside the intended directory, potentially overwriting or creating files in arbitrary user-writable locations on the filesystem. This can be exploited by an attacker who can supply a crafted archive and convince a user to load it, leading to arbitrary file write capabilities. The impact includes the possibility of privilege escalation, arbitrary code execution, or system compromise if critical files are overwritten or malicious binaries are placed. The CVSS v3.1 score is 7.8 (high), reflecting local attack vector, low attack complexity, no privileges required, but user interaction needed, and high impact on confidentiality, integrity, and availability. The vulnerability affects unspecified versions prior to container 0.8.0 and containerization 0.21.0, where the issue has been fixed by implementing proper pathname validation during extraction. No known exploits in the wild have been reported yet. This vulnerability is particularly relevant for environments using Apple Container technology for container image management and deployment.

For European organizations, this vulnerability poses a significant risk especially in environments where Apple Container technology is used for container image management. Successful exploitation can lead to arbitrary file writes, enabling attackers to implant malicious code, escalate privileges, or disrupt services by overwriting critical files. This can compromise the confidentiality of sensitive data, integrity of system and application files, and availability of containerized services. Organizations relying on containerized applications for critical business functions or infrastructure management could face operational disruptions or data breaches. The requirement for local access and user interaction somewhat limits remote exploitation but insider threats or social engineering attacks could facilitate exploitation. The lack of pathname validation also increases the risk of supply chain attacks if malicious container images are introduced. Given the widespread use of Apple products in sectors such as finance, healthcare, and government across Europe, the impact could be substantial if not mitigated promptly.

European organizations should immediately verify their use of Apple Container versions and upgrade to container 0.8.0 or containerization 0.21.0 or later where the vulnerability is patched. Restrict the use of cctl image load and container image load commands to trusted users and environments only. Implement strict controls and validation on container images before loading, including scanning for malicious pathnames or archive contents. Employ endpoint protection solutions capable of detecting anomalous file writes or suspicious container activity. Educate users on the risks of loading untrusted container images and enforce policies to prevent execution of unverified archives. Consider deploying application whitelisting to prevent execution of unauthorized binaries placed via this vulnerability. Monitor system logs and file integrity for unexpected changes in user-writable directories. In environments where patching is delayed, consider isolating Apple Container usage to limited, non-critical systems to reduce risk exposure.