Vulnerabilities in pkg:pypi/dbt-common

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-w75w-9qv4-j5xj",
  "modified" : "2026-03-06T22:51:40Z",
  "published" : "2026-03-05T00:59:10Z",
  "aliases" : [ "CVE-2026-29790" ],
  "summary" : "dbt-common's commonprefix() doesn't protect against path traversal",
  "details" : "### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\nA path traversal vulnerability exists in dbt-common's `safe_extract()` function used when extracting tarball archives. The function uses `os.path.commonprefix()` to validate that extracted files remain within the intended destination directory. However, `commonprefix()` compares paths character-by-character rather than by path components, allowing a malicious tarball to write files to sibling directories with matching name prefixes.\n\nFor example, when extracting to `/tmp/packages`, a crafted tarball could write files to `/tmp/packagesevil/` by exploiting the character-based prefix matching.\n\nThis vulnerability affects users who:\n- Install dbt packages from untrusted sources\n- Process tarball archives through dbt-common's extraction utilities\n\nThe practical risk is limited because:\n- Exploitation requires a malicious tarball to be processed\n- File writes are restricted to sibling directories with matching prefixes (not arbitrary paths)\n- Packages from trusted sources (dbt Hub) are not affected\n\nThis is similar to CVE-2026-1703 in pip, which had a CVSS score of 3.9 (Low).\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\nFixed in `dbt-common` version 1.37.3 & 1.34.2, and patched for dbt-core 1.11.7 and 1.10.20 releases.\n\nThe fix replaces `os.path.commonprefix()` with `os.path.commonpath()`, which correctly compares paths by their components rather than characters.\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\n- Only install dbt packages from trusted sources (official dbt Hub, verified git repositories)\n- Avoid installing packages from untrusted URLs or unverified third parties\n- Review package contents before installation when sourcing from external locations\n\n### Resources\n_Are there any links users can visit to find out more?_\n\n1. CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'): https://cwe.mitre.org/data/definitions/22.html\n2. CVE-2026-1703 (similar vulnerability in pip): https://nvd.nist.gov/vuln/detail/CVE-2026-1703\n3. pip fix PR #13777: https://github.com/pypa/pip/pull/13777\n4. Python documentation on `commonpath` vs `commonprefix`: https://docs.python.org/3/library/os.path.html#os.path.commonpath",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "dbt-common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.34.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "dbt-common"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.35.0"
      }, {
        "fixed" : "1.37.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/dbt-labs/dbt-common/security/advisories/GHSA-w75w-9qv4-j5xj"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-29790"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/pip/pull/13777"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dbt-labs/dbt-common/commit/e547954a48bac9394ef6eb98432e429dce9a7709"
  }, {
    "type" : "WEB",
    "url" : "https://docs.python.org/3/library/os.path.html#os.path.commonpath"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-6vgw-5pg2-w6jp"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/dbt-labs/dbt-common"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-05T00:59:10Z",
    "nvd_published_at" : "2026-03-06T21:16:15Z"
  }
}