{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "pnpm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "12.0.0-alpha.0"
            },
            {
              "fixed": "12.0.0-alpha.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-59",
      "CWE-73"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-01T18:59:22Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Summary\n\nA crafted lockfile alias could reach several install-time filesystem joins. With `--trust-lockfile` or a frozen lockfile, traversal segments could create links outside the intended project or `node_modules` boundary. This patch validates dependency names and every virtual-store slot before creating directories, links, bins, or hoisted entries.\n\n## Security boundary\n\n- A shared safe-join helper rejects traversal, absolute, platform-specific, and reserved dependency names before filesystem materialization.\n- Direct and transitive dependency links, package links, bin destinations, and public/private hoist destinations use the same containment rule.\n- Global virtual-store slots validate the complete slot path, including version-derived components, before directory creation.\n- Snapshot slots and package names are checked before store initialization and before the current-lockfile fast path, closing the warm-install bypass.\n- Rejections preserve `ERR_PNPM_INVALID_DEPENDENCY_NAME`.\n\n## Exploit replay\n\nBefore the patch, `pacquet install --frozen-lockfile --trust-lockfile` accepted a `../../escaped-link` dependency key and created a symlink outside the project. With this patch, the same lockfile is rejected before materialization and no outside link is created.\n\n## Files changed\n\n- `pacquet/crates/package-manager/src/safe_join_modules_dir.rs` defines the shared containment rule.\n- Install, symlink, bin, hoist, virtual-store, and frozen-lockfile paths call that helper before filesystem materialization.\n- The corresponding `tests.rs` files cover every sink, including warm installs and global virtual-store slots.\n\n## Commands run\n\n```text\n$ cargo test --locked -p pacquet-package-manager --lib\nPASS: 434 tests\n$ cargo clippy --locked -p pacquet-package-manager --all-targets -- --deny warnings\nPASS\n$ cargo fmt --all -- --check\nPASS\n```\n\n## Validation\n\n- Full pacquet package-manager suite: 434 passed.\n- Focused regressions cover direct and transitive aliases, bins, hoists, package names, global virtual-store version traversal, and a poisoned prior-install slot.\n- `cargo clippy -p pacquet-package-manager --all-targets -- -D warnings`: passed.\n- `cargo fmt --all -- --check` and `git diff --check`: passed.\n\n## Compatibility\n\nValid unscoped and scoped dependency aliases continue to work. The reproduced escape was specific to pacquet, so this branch does not change the TypeScript CLI or the lockfile format.\n\n---\nWritten by an agent (Codex, GPT-5).",
  "id": "GHSA-2rx9-3g3h-c2jv",
  "modified": "2026-09-01T18:59:22Z",
  "published": "2026-09-01T18:59:22Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pnpm/pnpm/security/advisories/GHSA-2rx9-3g3h-c2jv"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pnpm/pnpm/pull/12872"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pnpm/pnpm/commit/51300fd41c5e4c8f47635108e373cc3d1f324fa7"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pnpm/pnpm"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "pnpm: pacquet trust-lockfile install can create dependency symlinks outside the project"
}