Cabal deletes project source files during configure

{
  "affected": [
    {
      "database_specific": {
        "human_link": "https://github.com/haskell/security-advisories/tree/main/advisories/published/2026/HSEC-2026-0006.md",
        "osv": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export/2026/HSEC-2026-0006.json"
      },
      "package": {
        "ecosystem": "Hackage",
        "name": "Cabal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "database_specific": {
    "home": "https://github.com/haskell/security-advisories",
    "osvs": "https://raw.githubusercontent.com/haskell/security-advisories/refs/heads/generated/osv-export",
    "repository": "https://github.com/haskell/security-advisories"
  },
  "details": "# Cabal deletes project source files during configure\n\nThe `checkDuplicateHeaders` function in `Distribution.Simple.Configure` removes\nheader files from the source directory when a header with the same name exists in\nboth the build directory and the source directory.\n\nThis behavior was introduced in commit `3a9830b` to resolve header precedence\nissues, as C compilers prefer relative includes over `-I` search paths. The\nworkaround uses `removeFile` on source directory files, which is destructive and\nshould not happen during a build process.\n\nWhile the current implementation does not follow symlinks explicitly, the\ndeletion of source files outside of the project  during a build operation is\npossible on Microsoft Windows.\n",
  "id": "HSEC-2026-0006",
  "modified": "2026-04-08T14:23:27Z",
  "published": "2026-04-08T14:23:27Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://github.com/haskell/cabal/issues/11176"
    },
    {
      "type": "INTRODUCED",
      "url": "https://github.com/haskell/cabal/commit/3a9830bbdabef2f1009a69957966b778c7c1a9ee"
    }
  ],
  "schema_version": "1.5.0",
  "summary": "Cabal deletes project source files during configure"
}