---
id: CVE-2026-12481
title: >-
  A vulnerability in keras-team/keras version 3.14.0 allows for arbitrary code
  execution due to improper handling of deserialization in the `Lambda` layer
summary: >-
  A vulnerability in keras-team/keras version 3.14.0 allows for arbitrary code
  execution due to improper handling of deserialization in the `Lambda` layer.
  Specifically, the `_raise_for_lambda_deserialization()` function fails to
  enforce t…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-502
published: '2026-07-03'
updated: '2026-07-03'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-12481'
references:
  - url: 'https://huntr.com/bounties/59ceaed1-c8a3-4135-8f94-169ade02823d'
    label: security@huntr.dev
tags:
  - nvd
ingestedAt: '2026-07-04T11:56:06.584Z'
epss: 0.00719
epssPercentile: 0.52455
---

## Overview

A vulnerability in keras-team/keras version 3.14.0 allows for arbitrary code execution due to improper handling of deserialization in the `Lambda` layer. Specifically, the `_raise_for_lambda_deserialization()` function fails to enforce the safe-mode guard when `safe_mode` is set to `None`, which is the default value when `from_config()` is called outside of a `SafeModeScope` context. This logic error conflates `None` (unset/default-deny) with `False` (explicitly disabled), bypassing the guard and allowing attacker-controlled `marshal` bytecode to be deserialized. Affected call sites include `keras.layers.deserialize(config)`, `keras.models.clone_model(model)`, and any direct invocation of `Lambda.from_config(config)` without an enclosing `SafeModeScope(True)`. This vulnerability can be exploited to achieve arbitrary OS-level code execution in the context of the server or user process.

## Remediation

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