Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Gleam Gleam
Default version status: unaffected
0.32.4 to < 1.19.2affected
pkg:software-id/gleam.run/gleamGleam Gleam
Default version status: unaffected
v0.32.4-elixir to < v1.19.2-elixiraffectedv0.32.4-erlang to < v1.19.2-erlangaffectedv0.32.4-node to < v1.19.2-nodeaffectedv0.32.4-node-slim to < v1.19.2-node-slimaffectedv0.32.4-elixir-slim to < v1.19.2-elixir-slimaffectedv0.32.4-erlang-slim to < v1.19.2-erlang-slimaffectedv0.32.4-erlang-alpine to < v1.19.2-erlang-alpineaffectedv0.32.4-elixir-alpine to < v1.19.2-elixir-alpineaffectedv0.32.4-node-alpine to < v1.19.2-node-alpineaffectedv0.32.4-scratch to < v1.19.2-scratchaffected
pkg:oci/gleam?repository_url=ghcr.io%2Fgleam-langGleam Gleam
Default version status: unaffected
d13f27ee80aae7a521d2e9433c4deaf53f892574 to < *affected
pkg:github/gleam-lang/gleamReferences
- https://github.com/gleam-lang/gleam/security/advisories/GHSA-jhcr-c7qm-8589 ↗
- https://cna.erlef.org/cves/CVE-2026-103061.html ↗
- https://osv.dev/vulnerability/EEF-CVE-2026-103061 ↗
- https://github.com/gleam-lang/gleam/commit/d13f27ee80aae7a521d2e9433c4deaf53f892574 ↗
- https://github.com/gleam-lang/gleam/commit/d15c981fac6e533d70ac8ee89a6ef4dbf139adc3 ↗
- https://github.com/gleam-lang/gleam/commit/54bbb2b98af1505b6eed93c45b1936fc76412e5c ↗