CVE-2025-62161: youki container escape via "masked path" abuse due to mount race conditions
Vulnerability summary
CVE-2025-62161 is a critical (CVSS 10.0) UNIX Symbolic Link (Symlink) Following vulnerability in youki-dev youki. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 17.7% of scored vulnerabilities.
Not severe (CVSS 7.3, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Timeline
- 05-11-2025PublishedVulnerability first disclosed.
- 06-11-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 3 sources · 2 versions- OSV · Crates.ioEcosystem advisory · calculated7.3HighCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- NVDNIST7.3HighCVSS: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
- OSV · Crates.ioEcosystem advisory · calculated10.0CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS trend
Probability
0.26%
Chance of exploitation in the next 30 days
Percentile
18%
Versus all other CVEs
30-day change
Increase +0.02 pp
From 0.24% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-61UNIX Symbolic Link (Symlink) FollowingThe product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.
- CWE-363Race Condition Enabling Link FollowingThe product checks the status of a file or directory before accessing it, which produces a race condition in which the file can be replaced with a link before the access is performed, causing the product to access the wrong file.
Affected systems
Known conditions: local access, low-privilege account, user interaction (CVSS vector). Other conditions: not stated in public data.
Crates.Io1 product
- youki< 0.5.7
Youki-dev1 product
- youki< 0.5.7
2 vendors · 2 products
References
5 links- github.com/youki-dev/youki/security/advisories/GHSA-4g74-7cff-xcv8X Refsource CONFIRMWEBVendor Advisory
- github.com/youki-dev/youkiPACKAGE