erlang rebar3 3.7.0-rc1/3.27.1 Dependency Fetching rebar_packages:parse_deps app path traversal

Summaryinfo

A vulnerability classified as critical was found in erlang rebar3 3.7.0-rc1/3.27.1. This affects the function rebar_packages:parse_deps of the component Dependency Fetching. Such manipulation of the argument app leads to path traversal. This vulnerability is referenced as CVE-2026-103060. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, has been found in erlang rebar3 3.7.0-rc1/3.27.1. Affected by this issue is the function rebar_packages:parse_deps of the component Dependency Fetching. The manipulation of the argument app with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-103060 since 10/06/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 3.27.2 eliminates this vulnerability.

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Productinfo

Vendor

• erlang

Name

• rebar3

Version

• 3.7.0-rc1
• 3.27.1

Website

• Product: https://github.com/erlang/rebar3/

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