Docker & Kubernetes Under Siege: Three Critical runC Vulnerabilities Threaten Container Security
Three vulnerabilities in the runC container runtime used by Docker and Kubernetes could let attackers bypass isolation and access the host system. These flaws, tracked as CVE-2025-31133, CVE-2025-52565, and CVE-2025-52881, could lead to container escapes. RunC developers recommend using rootless containers as a precaution.
Hot Take:
Looks like the container world is having a bit of an identity crisis. With runC, Docker, and Kubernetes all in the mix, it’s like a reality TV show for containers—and not the kind where they all find true love and live happily ever after. Instead, they have a few skeletons in their closets that could let hackers crash the party. Time to patch things up before these vulnerabilities start throwing a full-blown rager on your host system!
Key Points:
- Three vulnerabilities in runC (CVE-2025-31133, CVE-2025-52565, CVE-2025-52881) threaten isolation in Docker and Kubernetes.
- Patches are available in runC versions 1.2.8, 1.3.3, and 1.4.0-rc.3 and later.
- Exploitation requires custom mount configurations, often through malicious images or Dockerfiles.
- No active exploits reported yet, but vigilance is advised.
- Mitigations include monitoring symlink behaviors and using rootless containers.