---
id: CVE-2026-103061
title: >-
  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 p…
summary: >-
  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 p…
severity: none
cwe:
  - CWE-22
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T19:16:36.387'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103061'
references:
  - url: 'https://cna.erlef.org/cves/CVE-2026-103061.html'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/gleam-lang/gleam/commit/54bbb2b98af1505b6eed93c45b1936fc76412e5c
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/gleam-lang/gleam/commit/d13f27ee80aae7a521d2e9433c4deaf53f892574
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/gleam-lang/gleam/commit/d15c981fac6e533d70ac8ee89a6ef4dbf139adc3
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/gleam-lang/gleam/security/advisories/GHSA-jhcr-c7qm-8589
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://osv.dev/vulnerability/EEF-CVE-2026-103061'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
tags:
  - nvd
ingestedAt: '2026-10-12T20:03:12.349Z'
---

## Overview

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.

## Remediation

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