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.
CVE-2026-79705
CVSS base score
4.5 (v3.1)
Severity
MEDIUM
Attack vector
Network
Weakness
CWE-22
Last modified
October 30, 2026
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N