{"affected":[{"ranges":[{"events":[{"introduced":"07b8f441ca711f9812fad9e9115bab3c3aa92f79"},{"fixed":"655fb95725ba2fb811740b57e106873833824344"},{"fixed":"3970738f687325138eb75f798054fa8960ac354e"},{"fixed":"696fdec922661d4a3cc528fc34bc24fae8d4ad8a"}],"repo":"https://github.com/erlang/otp","type":"GIT"}]}],"aliases":["GHSA-hmrc-prh3-rpvp","CVE-2026-21620"],"credits":[{"name":"Luigino Camastra / Aisle Research","type":"FINDER"},{"name":"Jakub Witczak","type":"REMEDIATION_REVIEWER"},{"name":"Raimo Niskanen","type":"REMEDIATION_DEVELOPER"}],"database_specific":{"capec_ids":["CAPEC-139"],"cpe_ids":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-23"]},"details":"## Summary\n\nRelative 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. This vulnerability is associated with program files lib/tftp/src/tftp\\_file.erl, src/tftp\\_file.erl.\n\nThis issue affects OTP from OTP 17.0 before OTP 28.3.2, OTP 27.3.4.8 and OTP 26.2.5.17, corresponding to tftp from 1.0 before 1.2.4, 1.2.2.1 and 1.1.1.1; also inets from 5.10 before 7.0.\n\n## Configuration\n\nA 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.","id":"EEF-CVE-2026-21620","modified":"2026-07-30T18:22:09.335067Z","published":"2026-02-20T10:57:08.620Z","references":[{"type":"ADVISORY","url":"https://github.com/erlang/otp/security/advisories/GHSA-hmrc-prh3-rpvp"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-21620.html"},{"type":"WEB","url":"https://www.erlang.org/doc/system/versions.html#order-of-versions"},{"type":"FIX","url":"https://github.com/erlang/otp/pull/10706"},{"type":"FIX","url":"https://github.com/erlang/otp/commit/696fdec922661d4a3cc528fc34bc24fae8d4ad8a"},{"type":"FIX","url":"https://github.com/erlang/otp/commit/3970738f687325138eb75f798054fa8960ac354e"},{"type":"FIX","url":"https://github.com/erlang/otp/commit/655fb95725ba2fb811740b57e106873833824344"}],"related":[],"schema_version":"1.7.3","severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","type":"CVSS_V4"}],"summary":"TFTP Path Traversal","upstream":[]}