Path traversal in Gleam via unvalidated package application names
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 1.19.2, v1.19.2-elixir, v1.19.2-erlang, v1.19.2-node, v1.19.2-node-slim, and 6 more
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
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 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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- gleam
From 0.32.4 · fixed in 1.19.2
- gleam-lang/gleam
From v0.32.4-elixir · fixed in v1.19.2-elixir; From v0.32.4-erlang · fixed in v1.19.2-erlang; From v0.32.4-node · fixed in v1.19.2-node; From v0.32.4-node-slim · fixed in v1.19.2-node-slim; From v0.32.4-elixir-slim · fixed in v1.19.2-elixir-slim; From v0.32.4-erlang-slim · fixed in v1.19.2-erlang-slim; From v0.32.4-erlang-alpine · fixed in v1.19.2-erlang-alpine; From v0.32.4-elixir-alpine · fixed in v1.19.2-elixir-alpine; From v0.32.4-node-alpine · fixed in v1.19.2-node-alpine; From v0.32.4-scratch · fixed in v1.19.2-scratch
- gleam-lang/gleam
From d13f27ee80aae7a521d2e9433c4deaf53f892574 · fixed in *