---
id: CVE-2026-21620
title: >-
  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
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. Thi…
severity: none
cwe:
  - CWE-23
published: '2026-02-20'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-21620'
references:
  - url: 'https://cna.erlef.org/cves/CVE-2026-21620.html'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/erlang/otp/commit/3970738f687325138eb75f798054fa8960ac354e
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/erlang/otp/commit/655fb95725ba2fb811740b57e106873833824344
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/erlang/otp/commit/696fdec922661d4a3cc528fc34bc24fae8d4ad8a
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://github.com/erlang/otp/pull/10706'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://github.com/erlang/otp/security/advisories/GHSA-hmrc-prh3-rpvp'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://osv.dev/vulnerability/EEF-CVE-2026-21620'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://www.erlang.org/doc/system/versions.html#order-of-versions'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
tags:
  - nvd
epss: 0.00479
epssPercentile: 0.38775
ingestedAt: '2026-07-24T15:30:58.120Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.