# CVE-2018-1100: zsh: zsh through version 5.4.2 is vulnerable to a stack-based buffer overflow in the utils.c:checkmailpath function

CVE-2018-1100 is fixed in 3 products on 1 platform, first by zsh 5.4.2-3ubuntu3.1, released September 4, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-1100
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0053
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 10, 2018

## Description

zsh through version 5.4.2 is vulnerable to a stack-based buffer overflow in the utils.c:checkmailpath function. A local attacker could exploit this to execute arbitrary code in the context of another user.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | zsh Ubuntu 18.04.6 LTS (bionic) | 5.4.2-3ubuntu3.1 | [zsh 5.4.2-3ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-zsh-5.4.2-3ubuntu3.1.md) | Sep 4, 2018 |
| Linux | zsh-common Ubuntu 18.04.6 LTS (bionic) | 5.4.2-3ubuntu3.1 | [zsh-common 5.4.2-3ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-zsh-common-5.4.2-3ubuntu3.1.md) | Sep 4, 2018 |
| Linux | zsh-static Ubuntu 18.04.6 LTS (bionic) | 5.4.2-3ubuntu3.1 | [zsh-static 5.4.2-3ubuntu3.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-zsh-static-5.4.2-3ubuntu3.1.md) | Sep 4, 2018 |

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Data as of 2026-11-07T06:34:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo