Symlink Following in Hex Package Export Allows Embedding Files Outside Project Root_CVE-2026-42795

{
    "lastseen": "",
    "description": "Symlink 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.",
    "published": "2026-06-02T13:41:39.527Z",
    "modified": "2026-06-02T13:41:39.527Z",
    "type": "cve",
    "title": "Symlink Following in Hex Package Export Allows Embedding Files Outside Project Root",
    "source": "EEF",
    "references": "https://github.com/gleam-lang/gleam/security/advisories/GHSA-qhh5-fg4c-8gqc\nhttps://cna.erlef.org/cves/CVE-2026-42795.html\nhttps://osv.dev/vulnerability/EEF-CVE-2026-42795\nhttps://github.com/gleam-lang/gleam/commit/6435a5528b9ae0449e2f32be579641ec485f6866",
    "id": "CVE-2026-42795",
    "bulletinFamily": "",
    "cwe": [
        "CWE-59"
    ],
    "cvelist": null,
    "sourceData": "Gleam Gleam 0.10.0-rc1\nGleam Gleam 0.10.0-rc1\nGleam Gleam c82a2d83bd0c06cafdc196820deb3f89a9b3ff7c\nGleam Gleam v0.10.0-rc1-elixir\nGleam Gleam v0.10.0-rc1-erlang\nGleam Gleam v0.10.0-rc1-node\nGleam Gleam v0.10.0-rc1-node-slim\nGleam Gleam v0.10.0-rc1-elixir-slim\nGleam Gleam v0.10.0-rc1-erlang-slim\nGleam Gleam v0.10.0-rc1-erlang-alpine\nGleam Gleam v0.10.0-rc1-elixir-alpine\nGleam Gleam v0.10.0-rc1-node-alpine\nGleam Gleam v0.10.0-rc1-scratch",
    "sourceHref": "",
    "cvss": {
        "score": 5.1,
        "severity": "MEDIUM",
        "vector": "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Gleam",
    "version": "0.10.0-rc1",
    "vendor": "Gleam",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}