# CVE-2018-12021: singularity-container: Singularity 2.3.0 through 2.5.1 is affected by an incorrect access control on systems supporting overlay file system

CVE-2018-12021 is fixed in singularity-container on 1 platform by singularity-container 2.4.2-4ubuntu0.1~esm1 (version 2.4.2-4ubuntu0.1~esm1), released December 17, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-12021
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0147
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 5, 2018

## Description

Singularity 2.3.0 through 2.5.1 is affected by an incorrect access control on systems supporting overlay file system. When using the overlay option, a malicious user may access sensitive information by exploiting a few specific Singularity features.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | singularity-container Ubuntu 18.04.6 LTS (bionic) | 2.4.2-4ubuntu0.1~esm1 | [singularity-container 2.4.2-4ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-singularity-container-2.4.2-4ubuntu0.1-esm1.md) | Dec 17, 2018 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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