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Vulnerabilities CVE-2025-4437

CVE-2025-4437

Medium
Open
TLP:CLEAR

Cri-o: large /etc/passwd file may lead to denial of service

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Description

There's a vulnerability in the CRI-O application where when container is launched with securityContext.runAsUser specifying a non-existent user, CRI-O attempts to create the user, reading the container's entire /etc/passwd file into memory. If this file is excessively large, it can cause the a high memory consumption leading applications to be killed due to out-of-memory. As a result a denial-of-service can be achieved, possibly disrupting other pods and services running in the same host.

Details

CVSS Score
5.7
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Confidence
90%
Published
Aug 20, 2025
Last Modified
Aug 21, 2026
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