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Vulnerability · Published Apr 11, 2026 · Assigned by EEF

CVE-2026-32146Improper Path Validation in Git Dependency Handling Allows Arbitrary File System Modification

High 8.6

In plain English

A high-severity path traversal in Gleam from Gleam. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).

Severity (CVSS 3.1)8.6High
Exploit odds (30 days)0.2%top 84.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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 products (as reported)

VendorProductVersions
Gleam Gleam 1.9.0-rc1 – before *
Gleam Gleam 1.9.0-rc1 – before *a4fde22445ab8e5cc79c2ff48971616cb570702c – before *
Gleam Gleam v1.9.0-rc1-elixir – before v1.15.4-elixirv1.9.0-rc1-erlang – before v1.15.4-erlangv1.9.0-rc1-node – before v1.15.4-nodev1.9.0-rc1-node-slim – before v1.15.4-node-slimv1.9.0-rc1-elixir-slim – before v1.15.4-elixir-slimv1.9.0-rc1-erlang-slim – before v1.15.4-erlang-slimv1.9.0-rc1-erlang-alpine – before v1.15.4-erlang-alpinev1.9.0-rc1-elixir-alpine – before v1.15.4-elixir-alpine

Weakness: CWE-22 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References