EEF-CVE-2026-21620

TFTP Path Traversal

## Summary 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. This vulnerability is associated with program files lib/tftp/src/tftp\_file.erl, src/tftp\_file.erl. This 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. ## Configurations 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.