CVE-2025-62596
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.25%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 4.0
- 7.3 HIGHCVSS: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/M
- EPSS
- 0.25% probability · 16th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-61, CWE-363
- Affected
- youki-dev/youki
- Source
- security-advisories@github.com
References
- https://github.com/youki-dev/youki/commit/5886c91073b9be748bd8d5aed49c4a820548030aPatch
- https://github.com/youki-dev/youki/security/advisories/GHSA-vf95-55w6-qmrfVendor Advisory
- https://pkg.go.dev/github.com/cyphar/filepath-securejoin/pathrs-lite/procfsNot Applicable
- https://youtu.be/tGseJW_uBB8Not Applicable
- https://youtu.be/y1PaBzxwRWQNot Applicable
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.