{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-21620","assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","state":"PUBLISHED","assignerShortName":"EEF","dateReserved":"2026-01-01T03:46:45.934Z","datePublished":"2026-02-20T10:57:08.620Z","dateUpdated":"2026-04-07T14:38:08.771Z"},"containers":{"cna":{"affected":[{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["tftp_file"],"packageName":"erlang/otp","packageURL":"pkg:github/erlang/otp","product":"OTP","programFiles":["lib/tftp/src/tftp_file.erl"],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"changes":[{"at":"26.2.5.17","status":"unaffected"},{"at":"27.3.4.8","status":"unaffected"},{"at":"28.3.2","status":"unaffected"}],"lessThan":"*","status":"affected","version":"17.0","versionType":"otp"},{"changes":[{"at":"655fb95725ba2fb811740b57e106873833824344","status":"unaffected"},{"at":"3970738f687325138eb75f798054fa8960ac354e","status":"unaffected"},{"at":"696fdec922661d4a3cc528fc34bc24fae8d4ad8a","status":"unaffected"}],"lessThan":"*","status":"affected","version":"07b8f441ca711f9812fad9e9115bab3c3aa92f79","versionType":"git"}]},{"defaultStatus":"unaffected","modules":["tftp_file"],"packageName":"inets","packageURL":"pkg:otp/inets?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git","product":"OTP","programFiles":["src/tftp_file.erl"],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"lessThan":"7.0","status":"affected","version":"5.10","versionType":"otp"}]},{"defaultStatus":"unaffected","modules":["tftp_file"],"packageName":"tftp","packageURL":"pkg:otp/tftp?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git","product":"OTP","programFiles":["src/tftp_file.erl"],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"changes":[{"at":"1.1.1.1","status":"unaffected"},{"at":"1.2.2.1","status":"unaffected"},{"at":"1.2.4","status":"unaffected"}],"lessThan":"*","status":"affected","version":"1.0","versionType":"otp"}]}],"configurations":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"A TFTP server must be started and the TFTP port must be reachable by the attacker, using the <tt>tftp</tt> application (or the legacy <tt>inets</tt> TFTP service) with the <tt>tftp_file</tt> callback module configured with the <tt>{root_dir, Dir}</tt> option."}],"value":"A TFTP server must be started and the TFTP port must be reachable by the attacker, using the tftp application (or the legacy inets TFTP service) with the tftp_file callback module configured with the {root_dir, Dir} option."}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*","versionEndExcluding":"26.2.5.17","vulnerable":true},{"criteria":"cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*","versionEndExcluding":"27.3.4.8","versionStartIncluding":"27.0","vulnerable":true},{"criteria":"cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*","versionEndExcluding":"28.3.2","versionStartIncluding":"28.0","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"AND"}],"credits":[{"lang":"en","type":"reporter","value":"Luigino Camastra"},{"lang":"en","type":"remediation reviewer","value":"Jakub Witczak"},{"lang":"en","type":"remediation developer","value":"Raimo Niskanen"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Relative Path Traversal, Improper Isolation or Compartmentalization vulnerability in erlang otp erlang/otp (tftp_file modules), erlang otp inets (tftp_file modules), erlang otp tftp (tftp_file modules) allows Relative Path Traversal.<p> This vulnerability is associated with program files <tt>lib/tftp/src/tftp_file.erl</tt>, <tt>src/tftp_file.erl</tt>.</p><p>This issue affects otp: from 17.0, from 07b8f441ca711f9812fad9e9115bab3c3aa92f79; otp: from 5.10 before 7.0; otp: from 1.0.</p>"}],"value":"Relative Path Traversal, Improper Isolation or Compartmentalization vulnerability in erlang otp erlang/otp (tftp_file modules), erlang otp inets (tftp_file modules), erlang otp tftp (tftp_file modules) allows Relative Path Traversal. 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