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:
The practical risk is limited because:
This is similar to CVE-2026-1703 in pip, which had a CVSS score of 3.9 (Low).
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.
Is there a way for users to fix or remediate the vulnerability without upgrading?
Are there any links users can visit to find out more?
1.34.21.37.3Exploitability
AV:NAC:LAT:PPR:LUI:AVulnerable System
VC:NVI:LVA:NSubsequent System
SC:NSI:NSA:N2.0/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