CVE-2026-47766: medium-severity vulnerability in containers crun
crun follows rootfs /dev symlink while creating default devices
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.1epss 0.2%
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.
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
Affected products
containers · crunRelated CVEs — containers crun
In the same product, most dangerous first.
CVE-2025-24965HIGH.krun_config.json symlink attack creates or overwrites file on the host in crunEPSS 0.6%CVE-2026-30892NONECrun incorrectly parses `crun exec` option `-u`, leading to privilege escalationEPSS 0.2%CVE-2026-88264MEDIUMCrun: crun: /dev/console symlink follow allows root-owned file creation outside the rootfsEPSS 0.1%