---
id: CVE-2026-32146
title: >-
  Improper path validation vulnerability in the Gleam compiler's handling of git
  dependencies allows arbitrary file system modification during dependency
  download.


  Dependency names from gleam.toml and manifest.toml are incorporated into f…
summary: >-
  Improper path validation vulnerability in the Gleam compiler's handling of git
  dependencies allows arbitrary file system modification during dependency
  download.


  Dependency names from gleam.toml and manifest.toml are incorporated into f…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-22
vendor: lpil
product: gleam
affected:
  - 'gleam >= 1.9.0, < 1.15.4'
patched:
  - gleam 1.15.4
published: '2026-04-11'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T01:17:28.607'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-32146'
references:
  - url: 'https://cna.erlef.org/cves/CVE-2026-32146.html'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/gleam-lang/gleam/commit/1aa5d8e594b0aa240bb213fce6ee19c65e6d5bcf
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/gleam-lang/gleam/commit/2dc0467f822c75de94697a912755d172928ee40a
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: >-
      https://github.com/gleam-lang/gleam/security/advisories/GHSA-vq5j-55vx-wq8j
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://osv.dev/vulnerability/EEF-CVE-2026-32146'
    label: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
  - url: 'https://access.redhat.com/security/cve/CVE-2026-32146'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2457578'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32146.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-04-13T17:44:39.043742Z'
epss: 0.00225
epssPercentile: 0.11743
ingestedAt: '2026-09-08T01:21:23.369Z'
---

## Overview

Improper path validation vulnerability in the Gleam compiler's handling of git dependencies allows arbitrary file system modification during dependency download.

Dependency names from gleam.toml and manifest.toml are incorporated into filesystem paths without sufficient validation or confinement to the intended dependency directory, allowing attacker-controlled paths (via relative traversal such as ../ or absolute paths) to target filesystem locations outside that directory. When resolving git dependencies (e.g. via gleam deps download), the computed path is used for filesystem operations including directory deletion and creation.

This vulnerability occurs during the dependency resolution and download phase, which is generally expected to be limited to fetching and preparing dependencies within a confined directory. A malicious direct or transitive git dependency can exploit this issue to delete and overwrite arbitrary directories outside the intended dependency directory, including attacker-chosen absolute paths, potentially causing data loss. In some environments, this may be further leveraged to achieve code execution, for example by overwriting git hooks or shell configuration files.

This issue affects Gleam from 1.9.0-rc1 until 1.15.4.

## Affected

- `gleam >= 1.9.0, < 1.15.4`

## Remediation

Upgrade past the affected range:

- `gleam 1.15.4`