Medium severity · published Oct 22, 2026
CVE-2025-65200
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…
New
5.4
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-65200
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-65200
localstack.com
http://localstack.com
cyberroute.github.io
https://cyberroute.github.io/post/2025-12-11-localstack-hack/
github.com
https://github.com/localstack/localstack/blob/aba1ee84592d76f0a88dd286fcd83b65080e31ac/localstack-core/localstack/services/cloudformation/deploy_ui.py
github.com
https://github.com/localstack/localstack/pull/13293/