# CVE-2026-47766

## Summary

- **CVE ID:** CVE-2026-47766
- **Severity:** MEDIUM
- **CVSS Score:** 5.1 (CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-61
- **Published:** Aug 14, 2026
- **Last Modified:** Aug 14, 2026

## Description

crun is an open source OCI Container Runtime fully written in C. Prior to version 1.28, crun's default device setup opens the container rootfs `/dev` directory without `O_NOFOLLOW`. If an OCI bundle contains `rootfs/dev` as a symlink and the bundle configuration does not mount `/dev`, crun follows that symlink and creates the default device nodes and stdio symlinks at the symlink target outside the container rootfs. In a local rootful crun replay, this created fixed device nodes and symlinks outside the rootfs before crun returned failure. A pre-existing file named `ptmx` in the target directory was also replaced by crun's forced `ptmx -> pts/ptmx` symlink. Version 1.28 fixes the issue.

## Affected Products

- containers — crun (< 1.28)

## References

- [CNA](https://github.com/containers/crun/security/advisories/GHSA-7vwr-4279-7gq5)
- [CNA](https://github.com/containers/crun/releases/tag/1.28)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.16%
- **EPSS Percentile:** 5.6

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._