A vulnerability exists in the chroot utility of uutils coreutils when using the --userspec option. The utility resolves the user specification via getpwnam() after entering the chroot but before dropping root privileges. On glibc-based systems, this can trigger the Name Service Switch (NSS) to load shared libraries (e.g., libnss_*.so.2) from the new root directory. If the NEWROOT is writable by an attacker, they can inject a malicious NSS module to execute arbitrary code as root, facilitating a full container escape or privilege escalation.
{
"cwe_ids": [
"CWE-426"
],
"github_reviewed": true,
"nvd_published_at": "2026-04-22T17:16:40Z",
"github_reviewed_at": "2026-04-30T17:50:13Z",
"severity": "HIGH"
}