Path Traversal in gleam docs build via documentation.pages Allows Arbitrary File Read and Write

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Summary

CVECVE-2026-32685
StatePUBLISHED
AssignerEEF
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-02 14:16:50 UTC
Updated2026-06-02 16:16:36 UTC
DescriptionPath traversal vulnerability in Gleam's handling of custom documentation pages allows arbitrary file read and file write outside the intended documentation output directory. The documentation.pages entries from gleam.toml are incorporated into filesystem paths without sufficient validation or confinement to the intended project and documentation output directories. The documentation.pages[].path field can be used to write generated documentation files outside the intended build/dev/docs/<package>/ output directory. The documentation.pages[].source field can be used to read files outside the project directory and embed their contents into generated documentation output. An attacker who can convince a victim to run gleam docs build on an untrusted project, or with untrusted gleam.toml content, can cause local files readable by the victim to be included in generated documentation artifacts, and can cause generated documentation files to be written outside the intended docs output directory. This issue affects Gleam from 1.16.0 until 1.17.0.

Risk And Classification

Primary CVSS: v4.0 4.6 MEDIUM from 6b3ad84c-e1a6-4bf7-a703-f496b71e49db

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/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-f496b71e49dbSecondary4.6MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS4.6MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

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

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/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 1.16.0 1.17.0 semver Not specified
CNA Gleam Gleam affected 1.16.0 1.17.0 semver Not specified
CNA Gleam Gleam affected 61ed8deb6572b5591ad17d6302c1a38607522f16 81570611906b6b0039c948037094d09a68700f3a git Not specified
CNA Gleam Gleam affected v1.16.0-elixir v1.17.0-elixir other Not specified
CNA Gleam Gleam affected v1.16.0-erlang v1.17.0-erlang other Not specified
CNA Gleam Gleam affected v1.16.0-node v1.17.0-node other Not specified
CNA Gleam Gleam affected v1.16.0-node-slim v1.17.0-node-slim other Not specified
CNA Gleam Gleam affected v1.16.0-elixir-slim v1.17.0-elixir-slim other Not specified
CNA Gleam Gleam affected v1.16.0-erlang-slim v1.17.0-erlang-slim other Not specified
CNA Gleam Gleam affected v1.16.0-erlang-alpine v1.17.0-erlang-alpine other Not specified
CNA Gleam Gleam affected v1.16.0-elixir-alpine v1.17.0-elixir-alpine other Not specified
CNA Gleam Gleam affected v1.16.0-node-alpine v1.17.0-node-alpine other Not specified
CNA Gleam Gleam affected v1.16.0-scratch v1.17.0-scratch other Not specified

References

ReferenceSourceLinkTags
cna.erlef.org/cves/CVE-2026-32685.html 6b3ad84c-e1a6-4bf7-a703-f496b71e49db cna.erlef.org
osv.dev/vulnerability/EEF-CVE-2026-32685 6b3ad84c-e1a6-4bf7-a703-f496b71e49db osv.dev
github.com/gleam-lang/gleam/security/advisories/GHSA-wjx8-7w8m-p4v7 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/gleam-lang/gleam/commit/c9230cd3045de8fd8481dae3a4557c0146df1430 6b3ad84c-e1a6-4bf7-a703-f496b71e49db github.com
github.com/gleam-lang/gleam/commit/81570611906b6b0039c948037094d09a68700f3a 6b3ad84c-e1a6-4bf7-a703-f496b71e49db github.com
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: evipepota (en)

CNA: evipepota (en)

CNA: Louis Pilfold (en)

CNA: Jonatan Männchen / EEF (en)

Additional Advisory Data

Workarounds

CNA: * Avoid running gleam docs build on untrusted projects * Review documentation.pages entries in gleam.toml before generating documentation * Run documentation generation in a restricted or isolated environment (e.g. containers)

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