gleam-lang Gleam up to 1.19.1 Dependency Resolution dependencies.rs hex_manifest_package app path traversal

Summaryinfo

A vulnerability, which was classified as problematic, was found in gleam-lang Gleam up to 1.19.1. Affected is the function hex_manifest_package of the file compiler-cli/src/dependencies.rs of the component Dependency Resolution. The manipulation of the argument app results in path traversal. This vulnerability is cataloged as CVE-2026-103061. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in gleam-lang Gleam up to 1.19.1. It has been classified as problematic. Affected is the function hex_manifest_package of the file compiler-cli/src/dependencies.rs of the component Dependency Resolution. The manipulation of the argument app with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as 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. This is going to have an impact on integrity, and availability. CVE summarizes:

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in gleam-lang gleam allows a malicious package publisher to delete a directory outside the project's build directory when a developer builds a project. A Hex package release's metadata carries an app field with the release's OTP application name. Gleam reads this field from the hex.pm release API when it downloads dependencies and uses it as the package's build directory name without validating it (hex_manifest_package in compiler-cli/src/dependencies.rs, ProjectPaths::build_directory_for_package). When a dependency fails to compile, Gleam deletes that directory with remove_dir_all. 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 or an absolute path. When a project depends on such a release directly or transitively and the release fails to compile, gleam build, gleam check, gleam run, gleam test or gleam export deletes the directory the name resolves to. For a pure Gleam package no publisher code runs. This issue affects gleam: from 0.32.4 before 1.19.2.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-103061 since 10/07/2026. The exploitability is told to be easy. It is possible to launch the attack 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 1.19.2 eliminates this vulnerability.

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Productinfo

Vendor

• gleam-lang

Name

• Gleam

Version

• 1.19.0
• 1.19.1

Website

• Product: https://github.com/gleam-lang/gleam/

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