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.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| Gleam | Gleam | unaffected |
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| Gleam | Gleam | unaffected |
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| Gleam | Gleam | unaffected |
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No advisories yet.
Solution
No solution given by the vendor.
Workaround
* 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)
Tue, 02 Jun 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Tue, 02 Jun 2026 14:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | Symlink Following in Hex Package Export Allows Embedding Files Outside Project Root | |
| First Time appeared |
Gleam-lang
Gleam-lang gleam |
|
| Weaknesses | CWE-59 | |
| CPEs | cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Gleam-lang
Gleam-lang gleam |
|
| References |
| |
| Metrics |
cvssV4_0
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Projects
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MITRE
Status: PUBLISHED
Assigner: EEF
Published:
Updated: 2026-06-02T15:04:35.767Z
Reserved: 2026-04-29T18:06:33.251Z
Link: CVE-2026-42795
Vulnrichment
Updated: 2026-06-02T15:03:56.544Z
NVD
Status : Deferred
Published: 2026-06-02T14:16:53.883
Modified: 2026-06-02T16:16:40.670
Link: CVE-2026-42795
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-06-02T15:45:06Z