dbt-labs dbt-common up to 1.34.1/1.37.2 tarball os.path.commonprefix path traversal

Summaryinfo

A vulnerability, which was classified as critical, has been found in dbt-labs dbt-common up to 1.34.1/1.37.2. This impacts the function os.path.commonprefix of the component tarball Handler. This manipulation causes path traversal. This vulnerability is tracked as CVE-2026-29790. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in dbt-labs dbt-common up to 1.34.1/1.37.2. It has been declared as critical. Affected by this vulnerability is the function os.path.commonprefix of the component tarball Handler. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-29790 since 03/04/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 1.34.2 or 1.37.3 eliminates this vulnerability.

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Productinfo

Vendor

• dbt-labs

Name

• dbt-common

Version

• 1.34.0
• 1.34.1
• 1.37.0
• 1.37.1
• 1.37.2

Website

• Product: https://github.com/dbt-labs/dbt-common/

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