---
id: CVE-2026-103060
title: >-
  Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  vulnerability in erlang rebar3 allows a malicious package publisher to delete
  a directory outside the project's _build directory and extract package files
  int…
summary: >-
  Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  vulnerability in erlang rebar3 allows a malicious package publisher to delete
  a directory outside the project's _build directory and extract package files
  int…
severity: none
cwe:
  - CWE-22
published: '2026-10-12'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T14:31:20.750'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103060'
references:
  - url: 'https://cna.erlef.org/cves/CVE-2026-103060.html'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/erlang/rebar3/commit/56b7d88975aa8da6446857cfd92de0825024bf63
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/erlang/rebar3/commit/e35282b26e499b1d9e8f30bba9dccd71cd8b02ba
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://github.com/erlang/rebar3/security/advisories/GHSA-6ggr-r7mh-2mv8'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://osv.dev/vulnerability/EEF-CVE-2026-103060'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
tags:
  - nvd
epss: 0.00371
epssPercentile: 0.29225
ingestedAt: '2026-10-12T16:57:59.908Z'
---

## Overview

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in erlang rebar3 allows a malicious package publisher to delete a directory outside the project's _build directory and extract package files into it when a developer fetches dependencies.

A package release's dependencies in a Hex registry carry an app field that names the dependency's OTP application. rebar3 uses this field as the dependency's name without validating it (rebar_packages:parse_deps/1) and builds the dependency's directory from that name (rebar_app_utils:dep_to_app/7). rebar_fetch:download_source_online/2 deletes that directory with rm -rf and moves the fetched package into it. hex.pm didn't restrict the field to a directory name before 2026-10-12, so a publisher could set it to a value such as ../../../../target. When a project depends on such a release directly or transitively, rebar3 get-deps deletes the directory the name resolves to and writes the dependency's files there. This happens before the dependency's own rebar.config.script is evaluated, and get-deps compiles nothing.

This issue affects rebar3: from 3.7.0-rc1 before 3.27.2.

## Remediation

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