Description
Youki is a container runtime written in Rust. In versions 0.5.6 and below, the initial validation of the source /dev/null is insufficient, allowing container escape when youki utilizes bind mounting the container's /dev/null as a file mask. This issue is fixed in version 0.5.7.
Affected products
youki-dev: youki
References9
- github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-x… Vendor Advisory
- github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-x… Vendor Advisory
- github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-x… Vendor Advisory
- github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-x… Vendor Advisory
- github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-x… Vendor Advisory
- github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-x… Vendor Advisory
- github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-x… Vendor Advisory
- github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-x… Vendor Advisory
- github.com/youki-dev/youki/commit/5886c91073b9be748bd8d5aed49c4… Patch
Metrics
- CVSS 3.1
-
10.0
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/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: 18 · 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.