{"id":"EEF-CVE-2026-42795","summary":"Symlink Following in Hex Package Export Allows Embedding Files Outside Project Root","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## Workarounds\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)","aliases":["CVE-2026-42795","GHSA-qhh5-fg4c-8gqc"],"modified":"2026-09-08T01:15:02.871087079Z","published":"2026-06-02T13:41:39.527Z","database_specific":{"cwe_ids":["CWE-59"],"capec_ids":["CAPEC-132"],"cpe_ids":["cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/gleam-lang/gleam","events":[{"introduced":"c82a2d83bd0c06cafdc196820deb3f89a9b3ff7c"},{"fixed":"6435a5528b9ae0449e2f32be579641ec485f6866"}]}],"versions":["v1.17.0-rc2","v1.17.0-rc1","v1.16.0","v1.16.0-rc4","v1.16.0-rc3","v1.16.0-rc2","v1.16.0-rc1","v1.15.1","v1.15.0","v1.15.0-rc2","v1.15.0-rc1","v1.14.0","v1.14.0-rc3","v1.14.0-rc2","v1.14.0-rc1","v1.13.0","v1.13.0-rc2","v1.13.0-rc1","v1.12.0","v1.12.0-rc3","v1.12.0-rc2","v1.12.0-rc1","v1.11.1","v1.11.0","v1.11.0-rc2","v1.11.0-rc1","v1.10.0","v1.10.0-rc1","v1.9.1","v1.9.0","v1.9.0-rc2","v1.9.0-rc1","v1.8.0","v1.8.0-rc1","v1.7.0-rc3","v1.7.0-rc2","v1.7.0-rc1","v1.6.1","v1.6.0","v1.6.0-rc2","v1.6.0-rc1","v1.5.0","v1.5.0-rc2","v1.5.0-rc1","v1.4.1","v1.4.0","v1.4.0-rc1","v1.3.2","v1.3.1","v1.3.0","v1.3.0-rc3","v1.3.0-rc2","v1.3.0-rc1","v1.2.1","v1.2.0","v1.2.0-rc2","v1.2.0-rc1","v1.1.0","v1.1.0-rc3","v1.1.0-rc2","v1.1.0-rc1","v1.0.0","v1.0.0-rc2","v1.0.0-rc1","v0.34.1","v0.34.0","v0.34.0-rc2","v0.34.0-rc1","v0.33.0","v0.33.0-rc4","v0.33.0-rc3","v0.33.0-rc2","v0.33.0-rc1","v0.32.4","v0.32.3","v0.32.2","v0.32.1","v0.32.0","v0.32.0-rc3","v0.32.0-rc2","v0.32.0-rc1","v0.31.0","v0.31.0-rc1","v0.30.5","v0.30.4","v0.30.3","v0.30.2","v0.30.1","v0.30.0","v0.30.0-rc4","v0.30.0-rc3","v0.30.0-rc2","v0.30.0-rc1","v0.29.0","v0.29.0-rc2","v0.29.0-rc1","v0.28.3","v0.28.2","v0.28.1","v0.28.0","v0.28.0-rc3","v0.28.0-rc2","v0.28.0-rc1","v0.27.0","v0.27.0-rc1","v0.26.2","v0.26.1","v0.26.0","v0.26.0-rc1","v0.25.3","v0.25.2","v0.25.1","v0.25.0","v0.25.0-rc2","v0.25.0-rc1","v0.24.0","v0.24.0-rc4","v0.24.0-rc3","v0.24.0-rc2","v0.24.0-rc1","v0.23.0","v0.23.0-rc2","v0.23.0-rc1","v0.22.1","v0.22.0","v0.22.0-rc1","v0.21.0","v0.21.0-rc2","v0.21.0-rc1","nightly","v0.20.1","v0.20.0","v0.20.0-rc1","v0.19.0","v0.19.0-rc4","v0.19.0-rc3","v0.19.0-rc2","v0.19.0-rc1","v0.18.2","v0.18.1","v0.18.0","v0.18.0-rc3","v0.18.0-rc2","v0.18.0-rc1","v0.17.0","v0.17.0-rc2","v0.17.0-rc1","v0.16.1","v0.16.0","v0.16.0-rc4","v0.16.0-rc3","v0.16.0-rc2","v0.16.0-rc1","v0.15.1","v0.15.0","v0.15.0-rc1","v0.14.4","v0.14.3","v0.14.2","v0.14.1","v0.14.0","v0.14.0-rc2","v0.14.0-rc1","v0.13.2","v0.13.1","v0.13.0","v0.13.0-rc2","v0.13.0-rc1","v0.12.1","v0.12.0","v0.12.0-rc4","v0.12.0-rc3","v0.11.2","v0.11.1","v0.11.0","v0.11.0-rc3","v0.11.0-rc2","v0.11.0-rc1","v0.10.1","v0.10.0","v0.10.0-rc2","v0.10.0-rc1"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-42795.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","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"}],"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"}]}