node-tar is a Tar for Node.js. node-tar prior to version 6.2.1 has no limit on the number of sub-folders created in the folder creation process. An attacker who generates a large number of sub-folders can consume memory on the system running node-tar and even crash the Node.js client within few seconds of running it using a path with too many sub-folders inside. Version 6.2.1 fixes this issue by preventing extraction in excessively deep sub-folders. A flaw was found in ISAACS's node-tar, where it is vulnerable to a denial of service, caused by the lack of folder count validation. The vulnerability exists due to the application not properly controlling the consumption of internal resources while parsing a tar file. By sending a specially crafted request, a remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.
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