Path Traversal in build/packages/packages.toml Allows Arbitrary Directory Deletion

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Summary

CVECVE-2026-43965
StatePUBLISHED
AssignerEEF
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-02 14:16:54 UTC
Updated2026-06-02 16:16:40 UTC
DescriptionPath 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.

Risk And Classification

Primary CVSS: v4.0 5.6 MEDIUM from 6b3ad84c-e1a6-4bf7-a703-f496b71e49db

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-22 | CWE-22 CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

VersionSourceTypeScoreSeverityVector
4.06b3ad84c-e1a6-4bf7-a703-f496b71e49dbSecondary5.6MEDIUMCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS5.6MEDIUMCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
Active
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gleam Gleam affected 0.18.0-rc1 1.17.0 semver Not specified
CNA Gleam Gleam affected 0.18.0-rc1 1.17.0 semver Not specified
CNA Gleam Gleam affected ed7aec0484f10d60978b63788c8a6497590855ab 690ca069817bee5f77a28fc3e360627c1da19291 git Not specified
CNA Gleam Gleam affected v0.18.0-rc1-elixir v1.17.0-elixir other Not specified
CNA Gleam Gleam affected v0.18.0-rc1-erlang v1.17.0-erlang other Not specified
CNA Gleam Gleam affected v0.18.0-rc1-node v1.17.0-node other Not specified
CNA Gleam Gleam affected v0.18.0-rc1-node-slim v1.17.0-node-slim other Not specified
CNA Gleam Gleam affected v0.18.0-rc1-elixir-slim v1.17.0-elixir-slim other Not specified
CNA Gleam Gleam affected v0.18.0-rc1-erlang-slim v1.17.0-erlang-slim other Not specified
CNA Gleam Gleam affected v0.18.0-rc1-erlang-alpine v1.17.0-erlang-alpine other Not specified
CNA Gleam Gleam affected v0.18.0-rc1-elixir-alpine v1.17.0-elixir-alpine other Not specified
CNA Gleam Gleam affected v0.18.0-rc1-node-alpine v1.17.0-node-alpine other Not specified
CNA Gleam Gleam affected v0.18.0-rc1-scratch v1.17.0-scratch other Not specified

References

ReferenceSourceLinkTags
cna.erlef.org/cves/CVE-2026-43965.html 6b3ad84c-e1a6-4bf7-a703-f496b71e49db cna.erlef.org
github.com/gleam-lang/gleam/commit/690ca069817bee5f77a28fc3e360627c1da19291 6b3ad84c-e1a6-4bf7-a703-f496b71e49db github.com
github.com/gleam-lang/gleam/security/advisories/GHSA-jqvf-f6p2-wrv3 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
osv.dev/vulnerability/EEF-CVE-2026-43965 6b3ad84c-e1a6-4bf7-a703-f496b71e49db osv.dev
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Aly (spect3r1) (en)

CNA: Abdelrahman Ahmed Aboelkasem (0x2face) (en)

CNA: Louis Pilfold (en)

CNA: Jonatan Männchen / EEF (en)

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