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PYSEC-2026-2440

LowCVSS 2 / 10
Published Jul 13, 2026·Last modified Jul 13, 2026
Affected Components(0)

No affected components available

Description

Impact

What kind of vulnerability is it? Who is impacted?

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.

For example, when extracting to /tmp/packages, a crafted tarball could write files to /tmp/packagesevil/ by exploiting the character-based prefix matching.

This vulnerability affects users who:

  • Install dbt packages from untrusted sources
  • Process tarball archives through dbt-common's extraction utilities

The practical risk is limited because:

  • Exploitation requires a malicious tarball to be processed
  • File writes are restricted to sibling directories with matching prefixes (not arbitrary paths)
  • Packages from trusted sources (dbt Hub) are not affected

This is similar to CVE-2026-1703 in pip, which had a CVSS score of 3.9 (Low).

Patches

Has the problem been patched? What versions should users upgrade to?

Fixed in dbt-common version 1.37.3 & 1.34.2, and patched for dbt-core 1.11.7 and 1.10.20 releases.

The fix replaces os.path.commonprefix() with os.path.commonpath(), which correctly compares paths by their components rather than characters.

Workarounds

Is there a way for users to fix or remediate the vulnerability without upgrading?

  • Only install dbt packages from trusted sources (official dbt Hub, verified git repositories)
  • Avoid installing packages from untrusted URLs or unverified third parties
  • Review package contents before installation when sourcing from external locations

Resources

Are there any links users can visit to find out more?

  1. CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'): https://cwe.mitre.org/data/definitions/22.html
  2. CVE-2026-1703 (similar vulnerability in pip): https://nvd.nist.gov/vuln/detail/CVE-2026-1703
  3. pip fix PR #13777: https://github.com/pypa/pip/pull/13777
  4. Python documentation on commonpath vs commonprefix: https://docs.python.org/3/library/os.path.html#os.path.commonpath
Risk Scores
Base Score
2.0

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges.

Threat Intelligence
0.4

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS
0.26%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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