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TI-2026-22249 Aliases CVE-2026-27905GHSA-m6w7-qv66-g3mf

BentoML has an Arbitrary File Write via Symlink Path Traversal in Tar Extraction

Priority HIGH 72CWE-59Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00293 22nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed BentoML (bentoml): 1.4.36bentoml (PyPI): 1.4.36

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
bentomlBentoMLbefore 1.4.361.4.36Patch availableCNA
—bentoml (PyPI)before 1.4.361.4.36Patch availableGHSA-m6w7-qv66-g3mf
  • BentoML Vendorbentoml Affected before 1.4.36 Fixed in 1.4.36 Patch available CNA
  • bentoml (PyPI) Vendor— Affected before 1.4.36 Fixed in 1.4.36 Patch available GHSA-m6w7-qv66-g3mf

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:bentoml:bentoml:*:*:*:*:*:*:*:*before 1.4.36Vulnerablebentoml
  • cpe:2.3:a:bentoml:bentoml:*:*:*:*:*:*:*:* Versions before 1.4.36 Vulnerable ·bentoml

Remediation

  • Fix · CNA BentoML (bentoml) Fixed in 1.4.36
  • Fix · GHSA-m6w7-qv66-g3mf bentoml (PyPI) Fixed in 1.4.36 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-27905
  2. 2026-10-03 Alias added: GHSA-m6w7-qv66-g3mf

References

Exploit 1

Patch 1

Advisory 1

Other 1

  • TI-2025-34190 BentoML is Vulnerable to an SSRF Attack Through File Upload Processing CVSS 3.1CRITICAL 9.9
  • TI-2025-23454 Insecure Deserialization leads to RCE in BentoML's runner server CVSS 3.1CRITICAL 9.8
  • TI-2025-20352 BentoML Allows Remote Code Execution (RCE) via Insecure Deserialization CVSS 3.1CRITICAL 9.8
  • TI-2026-27247 BentoML has a Server-Side Template Injection via unsandboxed Jinja2 Environment in Dockerfile generation CVSS 3.1CRITICAL 9.6
  • TI-2026-32312 BentoML: Dockerfile command injection via envs[*].name in bentofile.yaml CVSS 3.1HIGH 8.8
  • TI-2026-32311 BentoML: Dockerfile command injection via docker.base_image CVSS 3.1HIGH 8.8
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences