A flaw was found in the buildah/copier Go package. When used outside of Buildah by a non-root caller, a crafted tar archive containing malicious symlinks can escape the target extraction directory and create files outside the intended destination. Buildah itself uses chroot hardening and is not affected.
This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 4.5, indicating it can be exploited remotely over the network with relatively low complexity though user interaction is required . The vulnerability impacts integrity (unauthorized modifications), for affected systems.
Reported in 2026, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.
2026-09-15T17:17:27.313
2026-09-16T19:42:43.623
Awaiting Analysis
CVSSv3.1: 4.5 (MEDIUM)
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