{"id":"GHSA-h4fr-cmh5-qr62","summary":"Fallow: A `.*` glob segment let an analyzed repository make Fallow test paths in the parent of the project root","details":"### Impact\n\nFallow expands some globs from the analyzed repository on disk. Before 3.34.0, a segment such as `.*`, `.?` or `..*` in such a glob also matched the special `..` entry. The `glob` crate tests `..` against a segment that starts with a literal `.`. Fallow validates plugin glob patterns and refuses absolute paths and `..` segments, but these segments passed that validation.\n\nThe attacker controls the repository content. The attacker must also be able to read the Fallow output, for example a CI log or a pull request comment. Then the attacker can learn if a file or directory exists in the parent of the project root:\n\n- A plugin `fileExists` detection pattern such as `.*/marker.json` made the plugin active when `marker.json` existed in the parent directory.\n- An external plugin `configPatterns` or `alwaysUsed` pattern could match a config file in the parent directory. When the plugin was active and declared `toolingDependencies`, the tooling detection credited the related dev dependency. An unused dependency finding could then disappear, and `--trace-dependency` printed the outside path.\n- `fallow plugin-check` reported `path_exists: true` for a seeded entry that matched only in the parent directory.\n\nFallow tested only that these paths exist. It did not read or print the content of a file outside the project root through these globs.\n\nThe Jest, Vitest and Rstest project globs had the same `.*` problem, and the Jest and Vitest ones also read file content. GHSA-jfwm-3p3c-6hx5 describes that case.\n\n### Patches\n\nFixed in 3.34.0. Fallow now rewrites a leading `.` in a wildcard segment to `[.]` before it expands the glob on disk. `[.]` matches the same hidden files and directories inside the project root. The `glob` crate does not test `..` against it.\n\n### Workarounds\n\nRun Fallow only on repositories that you trust. Before you run Fallow on another repository, check the `detection`, `configPatterns` and `alwaysUsed` patterns of its plugin files.","modified":"2026-10-23T22:15:05.376415931Z","published":"2026-10-23T21:58:16Z","database_specific":{"nvd_published_at":null,"cwe_ids":["CWE-22"],"severity":"LOW","github_reviewed":true,"github_reviewed_at":"2026-10-23T21:58:16Z"},"references":[{"type":"WEB","url":"https://github.com/fallow-rs/fallow/security/advisories/GHSA-h4fr-cmh5-qr62"},{"type":"WEB","url":"https://github.com/fallow-rs/fallow/pull/3548"},{"type":"WEB","url":"https://github.com/fallow-rs/fallow/commit/133d4c862c74f4b1f0a7417c65b7157c1144294d"},{"type":"PACKAGE","url":"https://github.com/fallow-rs/fallow"},{"type":"WEB","url":"https://github.com/fallow-rs/fallow/releases/tag/v3.34.0"}],"affected":[{"package":{"name":"fallow","ecosystem":"npm","purl":"pkg:npm/fallow"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.34.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-h4fr-cmh5-qr62/GHSA-h4fr-cmh5-qr62.json"}},{"package":{"name":"@fallow-cli/fallow-node","ecosystem":"npm","purl":"pkg:npm/%40fallow-cli/fallow-node"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.34.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-h4fr-cmh5-qr62/GHSA-h4fr-cmh5-qr62.json"}},{"package":{"name":"fallow-cli","ecosystem":"crates.io","purl":"pkg:cargo/fallow-cli"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.34.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-h4fr-cmh5-qr62/GHSA-h4fr-cmh5-qr62.json"}},{"package":{"name":"fallow-config","ecosystem":"crates.io","purl":"pkg:cargo/fallow-config"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.34.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-h4fr-cmh5-qr62/GHSA-h4fr-cmh5-qr62.json"}},{"package":{"name":"fallow-core","ecosystem":"crates.io","purl":"pkg:cargo/fallow-core"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.34.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-h4fr-cmh5-qr62/GHSA-h4fr-cmh5-qr62.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N"}]}