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A Denial of Service (DoS) vulnerability (CVE-2026-59873) exists in the `node-tar` library (npm/tar <= 7.5.18) due to a lack of hard upper bounds on total decompressed data or entry counts, allowing an unauthenticated attacker to craft a small 'Gzip Bomb' archive that exhausts server resources like disk space and CPU, leading to system-wide failure and service outages.