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.
Affected products
youki-dev: youki
References5
- github.com/youki-dev/youki/security/advisories/GHSA-vf95-55w6-q… Vendor Advisory
- github.com/youki-dev/youki/commit/5886c91073b9be748bd8d5aed49c4… Patch
- pkg.go.dev/github.com/cyphar/filepath-securejoin/pathrs-lite/pr… Not Applicable
- youtu.be/tGseJW_uBB8 Not Applicable
- youtu.be/y1PaBzxwRWQ Not Applicable
Metrics
- CVSS 3.1
-
10.0
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H - CVSS 4.0
-
7.3
HIGH
Score source: CNA
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 19 · as of 10 November 2026
- CWE
- CWE-61CWE-363
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.