CVE-2025-32799: Conda-build Vulnerable to Path Traversal via Malicious Tar File

Vulnerability summary

CVE-2025-32799 is a critical (CVSS 9.8) Path Traversal vulnerability in anaconda conda-build. EPSS estimates a 1.33% chance of exploitation in the next 30 days, higher than 70.8% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 16-06-2025
   PublishedVulnerability first disclosed.
2. 17-06-2025
   Last modifiedVulnerability information updated.

Description

Conda-build contains commands and tools to build conda packages. Prior to version 25.4.0, the conda-build processing logic is vulnerable to path traversal (Tarslip) attacks due to improper sanitization of tar entry paths. Attackers can craft tar archives containing entries with directory traversal sequences to write files outside the intended extraction directory. This could lead to arbitrary file overwrites, privilege escalation, or code execution if sensitive locations are targeted. This issue has been patched in version 25.4.0.

• CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')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.