Path traversal in Gleam via unvalidated package application names

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-103061
StatePUBLISHED
AssignerEEF
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-12 19:16:36 UTC
Updated2026-10-12 19:16:36 UTC
DescriptionImproper 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.

Risk And Classification

Primary CVSS: v4.0 5.9 MEDIUM from 6b3ad84c-e1a6-4bf7-a703-f496b71e49db

CVSS:4.0/AV:N/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-f496b71e49dbSecondary5.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS5.9MEDIUMCVSS:4.0/AV:N/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
Network
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:N/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 0.32.4 1.19.2 semver Not specified
CNA Gleam Gleam affected v0.32.4-elixir v1.19.2-elixir other Not specified
CNA Gleam Gleam affected v0.32.4-erlang v1.19.2-erlang other Not specified
CNA Gleam Gleam affected v0.32.4-node v1.19.2-node other Not specified
CNA Gleam Gleam affected v0.32.4-node-slim v1.19.2-node-slim other Not specified
CNA Gleam Gleam affected v0.32.4-elixir-slim v1.19.2-elixir-slim other Not specified
CNA Gleam Gleam affected v0.32.4-erlang-slim v1.19.2-erlang-slim other Not specified
CNA Gleam Gleam affected v0.32.4-erlang-alpine v1.19.2-erlang-alpine other Not specified
CNA Gleam Gleam affected v0.32.4-elixir-alpine v1.19.2-elixir-alpine other Not specified
CNA Gleam Gleam affected v0.32.4-node-alpine v1.19.2-node-alpine other Not specified
CNA Gleam Gleam affected v0.32.4-scratch v1.19.2-scratch other Not specified
CNA Gleam Gleam affected d13f27ee80aae7a521d2e9433c4deaf53f892574 * git Not specified

References

ReferenceSourceLinkTags
github.com/gleam-lang/gleam/security/advisories/GHSA-jhcr-c7qm-8589 6b3ad84c-e1a6-4bf7-a703-f496b71e49db github.com
github.com/gleam-lang/gleam/commit/d13f27ee80aae7a521d2e9433c4deaf53f892574 6b3ad84c-e1a6-4bf7-a703-f496b71e49db github.com
github.com/gleam-lang/gleam/commit/54bbb2b98af1505b6eed93c45b1936fc76412e5c 6b3ad84c-e1a6-4bf7-a703-f496b71e49db github.com
osv.dev/vulnerability/EEF-CVE-2026-103061 6b3ad84c-e1a6-4bf7-a703-f496b71e49db osv.dev
github.com/gleam-lang/gleam/commit/d15c981fac6e533d70ac8ee89a6ef4dbf139adc3 6b3ad84c-e1a6-4bf7-a703-f496b71e49db github.com
cna.erlef.org/cves/CVE-2026-103061.html 6b3ad84c-e1a6-4bf7-a703-f496b71e49db cna.erlef.org
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: Peter Ullrich (en)

CNA: Louis Pilfold (en)

CNA: Eric Meadows-Jönsson (en)

CNA: Jonatan Männchen / EEF (en)

Additional Advisory Data

Solutions

CNA: Upgrade Gleam to 1.19.2 or later. Gleam then rejects a hex.pm release whose OTP application name, or the application name it gives a dependency, isn't a lowercase letter followed by lowercase letters, digits and _.

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