{"affected":[{"ranges":[{"events":[{"introduced":"c82a2d83bd0c06cafdc196820deb3f89a9b3ff7c"},{"fixed":"6435a5528b9ae0449e2f32be579641ec485f6866"}],"repo":"https://github.com/gleam-lang/gleam","type":"GIT"}]}],"aliases":["GHSA-qhh5-fg4c-8gqc","CVE-2026-42795"],"credits":[{"name":"Aly (spect3r1)","type":"FINDER"},{"name":"Abdelrahman Ahmed Aboelkasem (0x2face)","type":"FINDER"},{"name":"Louis Pilfold","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"ANALYST"}],"database_specific":{"capec_ids":["CAPEC-132"],"cpe_ids":["cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-59"]},"details":"## Summary\n\nSymlink following vulnerability in Gleam's Hex package export allows files outside the project root to be embedded in the generated package tarball.\n\nThe 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.\n\nAn 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.\n\nThis issue affects Gleam from 0.10.0-rc1 until 1.17.0.\n\n## Workaround\n\n* Avoid running gleam publish or gleam export hex-tarball on untrusted projects\n* Review the contents of src/ and priv/ for unexpected symlinks before publishing\n* Run publishing commands in a restricted or isolated environment (e.g. containers)","id":"EEF-CVE-2026-42795","modified":"2026-06-02T13:41:39.527Z","published":"2026-06-02T13:41:39.527Z","references":[{"type":"ADVISORY","url":"https://github.com/gleam-lang/gleam/security/advisories/GHSA-qhh5-fg4c-8gqc"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-42795.html"},{"type":"FIX","url":"https://github.com/gleam-lang/gleam/commit/6435a5528b9ae0449e2f32be579641ec485f6866"}],"related":[],"schema_version":"1.7.3","severity":[{"score":"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","type":"CVSS_V4"}],"summary":"Symlink Following in Hex Package Export Allows Embedding Files Outside Project Root","upstream":[]}