Python
CVE-2026-27905
HIGH
GHSA-m6w7-qv66-g3mf
Severity by source
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
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. Public exploit code exists for this vulnerability; users should upgrade to version 1.4.36 or later.
Technical ContextAI
Classified as CWE-59 (Improper Link Resolution Before File Access). Affects Bentoml. 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 sy
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 1.4.36..
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External POC / Exploit Code
Leaving vuln.today