{"id":"GHSA-p498-v437-472g","revision":null,"records":[{"revision":"ace5d2da5eb44fe7a14d1547df20a4ce","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-p498-v437-472g","aliases":[],"title":"humanfs: Recursive copy follows symlinked files and copies data from outside the source tree","description":"### Summary\n\n`@humanfs/node` does not treat symlinks as a separate case during copy operations. A symlink placed inside an attacker-controlled source tree can make `copyAll()` read and copy the contents of any file readable by the process, even when that file is outside the directory being copied.\n\n### Details\n\nThe Node implementation exposes symlink state through `list()`, but `copyAll()` ignores it. During recursive copies, every non-directory entry is passed to `copy()`, which delegates to `fs.promises.copyFile()`.\n\nOn Node, `copyFile()` dereferences symlinks. As a result, a symlink inside the copied tree is handled as if it were an ordinary file, and the destination receives the contents of the symlink target rather than a copy of the link itself.\n\nThat breaks the expected boundary of a directory copy. A caller can point `copyAll()` at a seemingly self-contained directory and still end up copying data from elsewhere on the host filesystem if the source tree contains attacker-supplied symlinks.\n\nThe same dereference behavior also affects `copy()` when the source path itself is a symlink.\n\n### PoC\n\n```js\nimport { NodeHfs } from \"@humanfs/node\";\nimport fs from \"node:fs/promises\";\nimport path from \"node:path\";\nimport os from \"node:os\";\n\nconst root = await fs.mkdtemp(path.join(os.tmpdir(), \"humanfs-\"));\nconst src = path.join(root, \"src\");\nconst dst = path.join(root, \"dst\");\nconst secret = path.join(root, \"secret.txt\");\n\nawait fs.mkdir(src);\nawait fs.writeFile(secret, \"TOPSECRET\");\nawait fs.symlink(secret, path.join(src, \"link.txt\"));\n\nconst hfs = new NodeHfs();\nawait hfs.copyAll(src, dst);\n\nconsole.log(await fs.readFile(path.join(dst, \"link.txt\"), \"utf8\"));\n// TOPSECRET\n```\n\n### Impact\n\nIf an application uses `copyAll()` or `copy()` on attacker-controlled paths, a symlink can be used to pull arbitrary readable host files into the copied output. In practice, that can turn a normal workspace copy, export, or packaging step into a file disclosure primitive.","state":0,"publishedAt":"2026-09-02T14:27:16+00:00","modifiedAt":"2026-09-10T03:50:54.5169028+00:00","affected":[{"ecosystem":"npm","name":"@humanfs/node","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.16.8"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/humanwhocodes/humanfs/security/advisories/GHSA-p498-v437-472g","https://github.com/humanwhocodes/humanfs/commit/22bbaa4487a3e6c1197ca619840de4615d0c3404","https://github.com/humanwhocodes/humanfs","https://github.com/humanwhocodes/humanfs/releases/tag/node-v0.16.8"],"sourceUrl":"https://github.com/advisories/GHSA-p498-v437-472g","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-p498-v437-472g","identifiers":["GHSA-p498-v437-472g"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-f981543109394c8f9b3df5737aa835e7","complete":false,"records":13821,"lastAttemptAt":"2026-11-15T11:15:00.6236179+00:00","lastSuccessAt":"2026-11-15T11:15:00.619+00:00","error":"257 identifier lookups failed; latest failures include AccessDenied (HTTP 403). Other identifiers were checked independently.","lastVerifiedAt":"2026-11-15T11:15:00.619+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13558,"expectedIdentifiers":13874,"failedIdentifiers":257},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-15T11:05:17.2943378+00:00","complete":true,"records":1125,"lastAttemptAt":"2026-11-15T11:05:17.2943378+00:00","lastSuccessAt":"2026-11-15T11:05:17.4693563+00:00","error":null,"lastVerifiedAt":"2026-11-15T11:05:17.4693566+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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