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.
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Affected Vendors & Products
References
History
Tue, 02 Jun 2026 15:30:00 +0000
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ssvc
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Tue, 02 Jun 2026 14:15:00 +0000
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| Description | 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. | |
| Title | Path Traversal in build/packages/packages.toml Allows Arbitrary Directory Deletion | |
| First Time appeared |
Gleam-lang
Gleam-lang gleam |
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| Weaknesses | CWE-22 | |
| CPEs | cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Gleam-lang
Gleam-lang gleam |
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| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: EEF
Published:
Updated: 2026-06-02T15:08:13.970Z
Reserved: 2026-05-04T18:23:25.573Z
Link: CVE-2026-43965
Updated: 2026-06-02T15:07:19.180Z
Status : Deferred
Published: 2026-06-02T14:16:54.053
Modified: 2026-06-02T14:46:08.900
Link: CVE-2026-43965
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OpenCVE Enrichment
No data.