---
id: CVE-2025-65200
title: >-
  An issue was discovered in localstack 4.9.2 allowing attackers to execute
  arbitrary code via crafted content hosted on a web-accessable URL and when
  passed said URL in the the templateURL to the
  _localstack/cloudformation/deploy endpoint…
summary: >-
  An issue was discovered in localstack 4.9.2 allowing attackers to execute
  arbitrary code via crafted content hosted on a web-accessable URL and when
  passed said URL in the the templateURL to the
  _localstack/cloudformation/deploy endpoint…
severity: critical
cvss: 9.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H'
cvssSource: adp
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-29T01:56:31.906089Z'
exploitAvailable: true
published: '2026-10-22'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T01:56:35.051Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-65200'
references:
  - url: 'http://localstack.com'
  - url: >-
      https://github.com/localstack/localstack/blob/aba1ee84592d76f0a88dd286fcd83b65080e31ac/localstack-core/localstack/services/cloudformation/deploy_ui.py
  - url: 'https://github.com/localstack/localstack/pull/13293/'
  - url: 'https://cyberroute.github.io/post/2025-12-11-localstack-hack/'
tags:
  - cve.org
  - exploit-available
epss: 0.00551
epssPercentile: 0.46076
ingestedAt: '2026-10-22T22:00:50.362Z'
---

## Overview

An issue was discovered in localstack 4.9.2 allowing attackers to execute arbitrary code via crafted content hosted on a web-accessable URL and when passed said URL in the the templateURL to the _localstack/cloudformation/deploy endpoint, the hosted content can get executed in the context of the docker container.

## Remediation

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