---
id: CVE-2026-9335
title: >-
  A vulnerability in keras-team/keras versions <= 3.14.0 allows arbitrary local
  HDF5 file content disclosure due to improper handling of HDF5 ExternalLinks
summary: >-
  A vulnerability in keras-team/keras versions <= 3.14.0 allows arbitrary local
  HDF5 file content disclosure due to improper handling of HDF5 ExternalLinks.
  The `KerasFileEditor` and `keras.saving.load_weights` functions bypass the
  `safe_g…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-22
published: '2026-08-02'
updated: '2026-08-02'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-9335'
references:
  - url: >-
      https://github.com/keras-team/keras/commit/23370f16b0ab9a200f7550a34e54a3ceab74ba0e
    label: security@huntr.dev
  - url: 'https://huntr.com/bounties/876a7226-5428-4a66-9d05-232461120db5'
    label: security@huntr.dev
tags:
  - nvd
  - exploit-available
ingestedAt: '2026-08-02T09:18:12.109Z'
epss: 0.00647
epssPercentile: 0.49235
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/paparojonathan/CVE-2026-9335-keras-hdf5-externallink'
  checkedAt: '2026-09-21T15:31:30.539Z'
exploitAvailable: true
---

## Overview

A vulnerability in keras-team/keras versions <= 3.14.0 allows arbitrary local HDF5 file content disclosure due to improper handling of HDF5 ExternalLinks. The `KerasFileEditor` and `keras.saving.load_weights` functions bypass the `safe_get_h5_group` and `safe_get_h5_dataset` helpers, which are designed to reject ExternalLinks and SoftLinks. This results in automatic dereferencing of links to external HDF5 files, enabling attackers to disclose sensitive data from the victim's local filesystem. Specifically, `KerasFileEditor` extracts attributes and datasets from linked files into its internal structures, while `keras.saving.load_weights` loads weights from linked files into the user's model. This issue can be exploited by providing a malicious `.h5`, `.weights.h5`, or `.keras` file containing ExternalLinks.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.