Description (CNA)
Path traversal vulnerability in Gleam's dependency management allows arbitrary directory deletion via malicious build/packages/packages.toml content. Package keys read from build/packages/packages.toml by LocalPackages::read_from_disc are passed without validation to paths.build_packages_package(), which constructs a filesystem path by joining the project build directory with the attacker-controlled key. The resulting path is then passed to fs::delete_directory (which calls remove_dir_all). No check is performed to ensure the path remains within the intended build/packages/ directory. Both absolute paths and relative traversal sequences (e.g. ../) are accepted as package keys, allowing deletion of arbitrary directories. An attacker who can cause a victim to run gleam deps download on a project containing a malicious build/packages/packages.toml (e.g. by committing the normally-gitignored file to a repository) can cause arbitrary directories on the victim's system to be recursively deleted. This issue affects Gleam from 0.18.0-rc1 until 1.17.0.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Gleam / Gleam | affected 0.18.0-rc1 before 1.17.0 |
| Gleam / Gleam | affected 0.18.0-rc1 before 1.17.0; affected ed7aec0484f10d60978b63788c8a6497590855ab before 690ca069817bee5f77a28fc3e360627c1da19291 |
| Gleam / Gleam | affected v0.18.0-rc1-elixir before v1.17.0-elixir; affected v0.18.0-rc1-erlang before v1.17.0-erlang; affected v0.18.0-rc1-node before v1.17.0-node; affected v0.18.0-rc1-node-slim before v1.17.0-node-slim; affected v0.18.0-rc1-elixir-slim before v1.17.0-elixir-slim; affected v0.18.0-rc1-erlang-slim before v1.17.0-erlang-slim; affected v0.18.0-rc1-erlang-alpine before v1.17.0-erlang-alpine; affected v0.18.0-rc1-elixir-alpine before v1.17.0-elixir-alpine; affected v0.18.0-rc1-node-alpine before v1.17.0-node-alpine; affected v0.18.0-rc1-scratch before v1.17.0-scratch |
CWE
CWE-22
References
- https://github.com/gleam-lang/gleam/security/advisories/GHSA-jqvf-f6p2-wrv3
- https://cna.erlef.org/cves/CVE-2026-43965.html
- https://osv.dev/vulnerability/EEF-CVE-2026-43965
- https://github.com/gleam-lang/gleam/commit/690ca069817bee5f77a28fc3e360627c1da19291
ADP enrichment
No English description supplied.