EEF-CVE-2026-42795
- Source
- https://cna.erlef.org/osv/EEF-CVE-2026-42795.html
- Import Source
- https://cna.erlef.org/osv/EEF-CVE-2026-42795.json
- JSON Data
- https://api.osv.dev/v1/vulns/EEF-CVE-2026-42795
- Aliases
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- CVE-2026-42795
- GHSA-qhh5-fg4c-8gqc
- Published
- 2026-06-02T13:41:39Z
- Modified
- 2026-09-08T01:15:02Z
- Severity
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- 5.1 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Symlink Following in Hex Package Export Allows Embedding Files Outside Project Root
- Details
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Summary
Symlink following vulnerability in Gleam's Hex package export allows files outside the project root to be embedded in the generated package tarball.
The file collection helpers (gleam_files, native_files, private_files) in compiler-cli/src/fs.rs use follow_links(true) when walking publishable directories such as src/ and priv/. The collected paths are added to the package archive via add_path_to_tar in compiler-cli/src/publish.rs without verifying that the resolved target remains within the project root. A symlink placed under a publishable directory will cause gleam export hex-tarball or gleam publish to embed the contents of the symlink target into the generated Hex package.
An attacker with write access to the project repository can place a symlink in src/ or priv/ pointing to an arbitrary file. When a maintainer or CI pipeline runs gleam publish or gleam export hex-tarball, local files readable by the publisher (such as secrets, tokens, or SSH keys) are silently embedded into the published package artifact.
This issue affects Gleam from 0.10.0-rc1 until 1.17.0.
Workarounds
* Avoid running gleam publish or gleam export hex-tarball on untrusted projects * Review the contents of src/ and priv/ for unexpected symlinks before publishing * Run publishing commands in a restricted or isolated environment (e.g. containers)
- Database specific
{ "capec_ids": [ "CAPEC-132" ], "cpe_ids": [ "cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*" ], "cwe_ids": [ "CWE-59" ] }- References
- Credits
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- Aly (spect3r1) - FINDER
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- Abdelrahman Ahmed Aboelkasem (0x2face) - FINDER
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- Louis Pilfold - REMEDIATION_DEVELOPER
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- Jonatan Männchen / EEF - ANALYST
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