CVE-2026-27905
HIGH
GHSA-m6w7-qv66-g3mf
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
4Description
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.
Analysis
Arbitrary file write in BentoML prior to version 1.4.36 allows local attackers to write files to arbitrary locations on the host system by crafting malicious tar archives containing symlinks that point outside the extraction directory. The vulnerability exists because the safe_extract_tarfile() function fails to validate symlink targets, only validating the symlink path itself, enabling attackers to bypass directory traversal protections. …
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Remediation
Within 24 hours: Identify all systems running BentoML and assess exposure in production environments. Within 7 days: Apply the available vendor patch to all affected BentoML deployments and validate functionality post-patch. …
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External POC / Exploit Code
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