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5.1 Medium

CVE-2026-47766 crun is an open source OCI Container Runtime fully written in C

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 and versions

Product Affected versions Fixed in
crun 1.28 earliest → < 1.28 1.28

References

Timeline

  1. Published
  2. Last modified

Other CVEs of crun

The 4 CVEs of crun →
CVE-2026-88264 Crun: crun: /dev/console symlink follow allows root-owned file creation outside the rootfs 5.6 Medium CVE-2026-30892 crun is an open source OCI Container Runtime fully written in C 0.0 Not rated CVE-2025-24965 crun is an open source OCI Container Runtime fully written in C 8.5 High
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