CVE-2026-40610 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-40610MEDIUM

BentoML has Information Disclosure in `bentoml build` via symlink traversal in the build context

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   N   R  U  H  N  N    5.5   .0028   21.0     —

AFFECTED
  Product  Versions    Fixed
  BentoML  < 1.4.39 –  —

TIMELINE
  Apr 14  Reserved by GitHub_M
  May 22  EXPLOIT PUBLISHED — CVE-2026-40610 (BentoML). Public exploit reference added.
  May 22  Published (CNA: GitHub_M)

CWE-59 · CNA: GitHub_M · CVSS v3.1 · 3 references · NVD status: Analyzed

Description

BentoML is a Python library for building online serving systems optimized for AI apps and model inference. In versions 1.4.38 and prior, the build packaging workflow follows attacker-controlled symlinks inside the build context and copies the referenced file contents into the generated Bento artifact. If a victim builds an untrusted repository or other attacker-supplied build context, the attacker can place a symlink such as loot.txt -> /tmp/outside-marker.txt or a link to a more sensitive local file. When bentoml build runs, BentoML dereferences the symlink and packages the target file contents into the Bento. The leaked file can then propagate further through export, push, or containerization workflows. An attacker can exfiltrate local files from the build host into the Bento artifact, exposing secrets such as cloud credentials, SSH keys, API tokens, environment files, or other sensitive local configurations. Because Bento artifacts are commonly exported, uploaded, stored, or containerized after build, the leaked file contents can spread beyond the original build machine. This issue has been fixed in version 1.4.39.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 14, 2026	Reserved	Reserved by GitHub_M
May 22, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-40610 (BentoML). Public exploit reference added.
May 22, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
bentoml	BentoML	—	< 1.4.39	—

Weaknesses

CWE-59

References (3)

https://github.com/bentoml/BentoML/commit/5fb7cd41f92e2a56b45391284cf15b9ac9963a1f [Patch]
https://github.com/bentoml/BentoML/releases/tag/v1.4.39 [Product, Release Notes]
https://github.com/bentoml/BentoML/security/advisories/GHSA-mcfx-4vc6-qgxv [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-40610 at cve.org

Vendors: bentoml

Weaknesses: CWE-59

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-40610 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.