CVE-2025-62161
published 2025-11-06CVE-2025-62161: 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…
PriorityP354critical10CVSS 3.1
AVNACLPRNUINSCCHIHAH
EPSS
0.22%
12.5th percentile
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
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| youki-dev | youki | < 0.5.7 | 0.5.7 |
| youki-dev | youki | >= 0 < 0.5.7 | 0.5.7 |
CVSS provenance
nvdv3.110.0CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
nvdv4.07.3HIGHCVSS: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
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GHSA
youki container escape via "masked path" abuse due to mount race conditions
ghsa·2025-11-05
CVE-2025-62161 [HIGH] CWE-363 youki container escape via "masked path" abuse due to mount race conditions
youki container escape via "masked path" abuse due to mount race conditions
### Impact ###
youki utilizes bind mounting the container's `/dev/null` as a file mask. When performing this operation, the initial validation of the source `/dev/null` was insufficient. Specifically, we initially failed to verify whether `/dev/null` was genuinely present. However, we did perform validation to ensure that the `/dev/null` path existed within the container, including checking for symbolic links. Additionally, there was a vulnerability in the timing between validation and the actual mount operation.
As a result, by replacing `/dev/null` with a symbolic link, we can bind-mount arbitrary files from the host system.
This is a different project, but the core logic is similar to the CVE in runc. Issues
OSV
youki container escape via "masked path" abuse due to mount race conditions
osv·2025-11-05
CVE-2025-62161 [HIGH] youki container escape via "masked path" abuse due to mount race conditions
youki container escape via "masked path" abuse due to mount race conditions
### Impact ###
youki utilizes bind mounting the container's `/dev/null` as a file mask. When performing this operation, the initial validation of the source `/dev/null` was insufficient. Specifically, we initially failed to verify whether `/dev/null` was genuinely present. However, we did perform validation to ensure that the `/dev/null` path existed within the container, including checking for symbolic links. Additionally, there was a vulnerability in the timing between validation and the actual mount operation.
As a result, by replacing `/dev/null` with a symbolic link, we can bind-mount arbitrary files from the host system.
This is a different project, but the core logic is similar to the CVE in runc. Issues
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/youki-dev/youki/commit/5886c91073b9be748bd8d5aed49c4a820548030ahttps://github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-xcv8https://github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-xcv8https://github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-xcv8https://github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-xcv8
2025-11-06
Published