{"id":"CVE-2026-29790","aliases":["EUVD-2026-10069","GHSA-w75w-9qv4-j5xj","PYSEC-2026-2440"],"status":"published","title":"dbt-common: commonprefix() doesn't protect against path traversal","description":"dbt-common is the shared common utilities for dbt-core and adapter implementations use. Prior to versions 1.34.2 and 1.37.3, a 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. This issue has been patched in versions 1.34.2 and 1.37.3.","severity":{"version":"4.0","score":2,"vector":"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","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00306,"percentile":0.23666,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-22"],"published":"2026-03-05T00:59:10Z","modified":"2026-10-28T02:31:07Z","fixes":[{"ecosystem":"PyPI","package":"dbt-common","fixed_in":["1.34.2","1.37.3"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"dbt-common","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.34.2"}]}]},{"source":"ghsa","ecosystem":"PyPI","package":"dbt-common","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.35.0"},{"fixed":"1.37.3"}]}]},{"source":"osv","ecosystem":"PyPI","package":"dbt-common","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.34.2"}]}],"versions":["0.1.0","0.1.0a1","0.1.1","0.1.3","0.1.4","0.1.5","0.1.6","1.0.0","1.0.0b1","1.0.0b2","1.0.1","1.0.2","1.0.3","1.0.4","1.1.0","1.10.0","1.11.0","1.12.0","1.13.0","1.14.0","1.15.0","1.16.0","1.17.0","1.18","1.19","1.2.0","1.20","1.21.0","1.22.0","1.23.0","1.24.0","1.25.0","1.25.1","1.26.0","1.27.0","1.27.1","1.28.0","1.29.0","1.3.0","1.30.0","1.31.0","1.32.0","1.33.0","1.34.0","1.34.1","1.4.0","1.5.0","1.6.0","1.7.0","1.8.0","1.9.0"]},{"source":"osv","ecosystem":"PyPI","package":"dbt-common","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.35.0"},{"fixed":"1.37.3"}]}],"versions":["1.35.0","1.36.0","1.37.0","1.37.1","1.37.2"]},{"source":"osv","ecosystem":"PyPI","package":"dbt-common","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.34.2"},{"introduced":"1.35.0"},{"fixed":"1.37.3"}]}],"versions":["0.1.0","0.1.0a1","0.1.1","0.1.3","0.1.4","0.1.5","0.1.6","1.0.0","1.0.0b1","1.0.0b2","1.0.1","1.0.2","1.0.3","1.0.4","1.1.0","1.10.0","1.11.0","1.12.0","1.13.0","1.14.0","1.15.0","1.16.0","1.17.0","1.18","1.19","1.2.0","1.20","1.21.0","1.22.0","1.23.0","1.24.0","1.25.0","1.25.1","1.26.0","1.27.0","1.27.1","1.28.0","1.29.0","1.3.0","1.30.0","1.31.0","1.32.0","1.33.0","1.34.0","1.34.1","1.35.0","1.36.0","1.37.0","1.37.1","1.37.2","1.4.0","1.5.0","1.6.0","1.7.0","1.8.0","1.9.0"]}],"products":[{"vendor":"dbt-labs","product":"dbt-common"},{"vendor":"getdbt","product":"dbt-common"}],"references":[{"url":"https://github.com/dbt-labs/dbt-common/security/advisories/GHSA-w75w-9qv4-j5xj","tags":["x_refsource_CONFIRM","Mitigation","Vendor Advisory","advisory","web"]},{"url":"https://github.com/pypa/pip/pull/13777","tags":["x_refsource_MISC","Issue Tracking","fix","web"]},{"url":"https://github.com/dbt-labs/dbt-common/commit/e547954a48bac9394ef6eb98432e429dce9a7709","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://docs.python.org/3/library/os.path.html#os.path.commonpath","tags":["web"]},{"url":"https://github.com/advisories/GHSA-6vgw-5pg2-w6jp","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29790","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-w75w-9qv4-j5xj","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29790.json","tags":["advisory"]},{"url":"https://github.com/dbt-labs/dbt-common","tags":["package"]},{"url":"https://pypi.org/project/dbt-common","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-29790","title":"dbt-common: commonprefix() doesn't protect against path traversal","description":"dbt-common is the shared common utilities for dbt-core and adapter implementations use. Prior to versions 1.34.2 and 1.37.3, a 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. This issue has been patched in versions 1.34.2 and 1.37.3.","status":"published","published":"2026-03-06T20:37:42.354Z","modified":"2026-03-09T20:54:30.453Z","cvss":[{"version":"4.0","score":2,"vector":"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","level":"low","assessor":"cna"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:19:56.284359Z"}],"euvd":[{"id":"EUVD-2026-10069","description":"dbt-common is the shared common utilities for dbt-core and adapter implementations use. Prior to versions 1.34.2 and 1.37.3, a 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. This issue has been patched in versions 1.34.2 and 1.37.3.","status":"published","published":"2026-03-06T20:37:42Z","modified":"2026-03-09T20:54:30Z","cvss":[{"version":"4.0","score":2,"vector":"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","level":"low"}],"updated_at":"2026-11-02T19:48:06.014236Z"}],"ghsa":[{"id":"GHSA-w75w-9qv4-j5xj","title":"dbt-common's commonprefix() doesn't protect against path traversal","description":"### 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 \u0026 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","status":"published","published":"2026-03-05T00:59:10Z","modified":"2026-03-06T22:51:41Z","cvss":[{"version":"4.0","score":2,"vector":"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","level":"low"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:39:32.329372Z"}],"nvd":[{"id":"CVE-2026-29790","description":"dbt-common is the shared common utilities for dbt-core and adapter implementations use. Prior to versions 1.34.2 and 1.37.3, a 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. This issue has been patched in versions 1.34.2 and 1.37.3.","status":"published","published":"2026-03-06T21:16:15.63Z","modified":"2026-06-17T10:29:53.53Z","cvss":[{"version":"4.0","score":2,"vector":"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/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":"low","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:12:08.279852Z"}],"osv":[{"id":"CVE-2026-29790","title":"dbt-common: commonprefix() doesn't protect against path traversal","description":"dbt-common is the shared common utilities for dbt-core and adapter implementations use. Prior to versions 1.34.2 and 1.37.3, a 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. This issue has been patched in versions 1.34.2 and 1.37.3.","status":"published","published":"2026-03-06T20:37:42.354Z","modified":"2026-10-28T02:31:07.016960407Z","cvss":[{"version":"4.0","score":2,"vector":"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","level":"low"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:45:00.530889Z"},{"id":"GHSA-w75w-9qv4-j5xj","title":"dbt-common's commonprefix() doesn't protect against path traversal","description":"### 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 \u0026 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","status":"published","published":"2026-03-05T00:59:10Z","modified":"2026-09-10T03:50:41.434044516Z","cvss":[{"version":"4.0","score":2,"vector":"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","level":"low"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:46:58.401149Z"},{"id":"PYSEC-2026-2440","title":"dbt-common's commonprefix() doesn't protect against path traversal","description":"### 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 \u0026 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","status":"published","published":"2026-07-13T14:36:40.777932Z","modified":"2026-07-13T16:31:42.929992505Z","cvss":[{"version":"4.0","score":2,"vector":"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","level":"low"}],"updated_at":"2026-11-02T15:52:55.961245Z"}]}}