{"affected":[{"ranges":[{"events":[{"introduced":"ed7aec0484f10d60978b63788c8a6497590855ab"},{"fixed":"690ca069817bee5f77a28fc3e360627c1da19291"}],"repo":"https://github.com/gleam-lang/gleam","type":"GIT"}]}],"aliases":["GHSA-jqvf-f6p2-wrv3","CVE-2026-43965"],"credits":[{"name":"Aly (spect3r1)","type":"FINDER"},{"name":"Abdelrahman Ahmed Aboelkasem (0x2face)","type":"FINDER"},{"name":"Louis Pilfold","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"ANALYST"}],"database_specific":{"capec_ids":["CAPEC-139","CAPEC-597"],"cpe_ids":["cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-22"]},"details":"## Summary\n\nPath traversal vulnerability in Gleam's dependency management allows arbitrary directory deletion via malicious build/packages/packages.toml content.\n\nPackage 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.\n\nAn 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.\n\nThis issue affects Gleam from 0.18.0-rc1 until 1.17.0.","id":"EEF-CVE-2026-43965","modified":"2026-06-02T13:41:37.421Z","published":"2026-06-02T13:41:37.421Z","references":[{"type":"ADVISORY","url":"https://github.com/gleam-lang/gleam/security/advisories/GHSA-jqvf-f6p2-wrv3"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-43965.html"},{"type":"FIX","url":"https://github.com/gleam-lang/gleam/commit/690ca069817bee5f77a28fc3e360627c1da19291"}],"related":[],"schema_version":"1.7.3","severity":[{"score":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","type":"CVSS_V4"}],"summary":"Path Traversal in build/packages/packages.toml Allows Arbitrary Directory Deletion","upstream":[]}