Vulnerability Description
BentoML is a Python library for building online serving systems optimized for AI apps and model inference. Prior to 1.4.36, the safe_extract_tarfile() function validates that each tar member's path is within the destination directory, but for symlink members it only validates the symlink's own path, not the symlink's target. An attacker can create a malicious bento/model tar file containing a symlink pointing outside the extraction directory, followed by a regular file that writes through the symlink, achieving arbitrary file write on the host filesystem. This vulnerability is fixed in 1.4.36.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Bentoml | Bentoml | < 1.4.36 |
Related Weaknesses (CWE)
References
- https://github.com/bentoml/BentoML/commit/4e0eb007765ac04c7924220d643f264715cc96Patch
- https://github.com/bentoml/BentoML/security/advisories/GHSA-m6w7-qv66-g3mfExploitMitigationVendor Advisory
FAQ
What is CVE-2026-27905?
CVE-2026-27905 is a vulnerability with a CVSS score of 7.8 (HIGH). BentoML is a Python library for building online serving systems optimized for AI apps and model inference. Prior to 1.4.36, the safe_extract_tarfile() function validates that each tar member's path is...
How severe is CVE-2026-27905?
CVE-2026-27905 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-27905?
Check the references section above for vendor advisories and patch information. Affected products include: Bentoml Bentoml.