Vulnerability Description
Contrast is a confidential-computing runtime for Kubernetes. In versions before 1.19.1, the Kata agent policies generated by the Contrast CLI contained a flaw in the CopyFile verification that allowed arbitrary writes to the guest root filesystem. A malicious process on the untrusted host able to connect to the Kata agent VSOCK could issue a series of CopyFile requests to overwrite security-critical files in the guest or trick the workload into disclosing sensitive data, effectively amounting to a full guest takeover. Users unable to upgrade can apply an equivalent rego policy fix passed to 'contrast generate --policy'.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/edgelesssys/contrast/security/advisories/GHSA-rh99-wc69-c255
- https://www.vulncheck.com/advisories/contrast-before-1.19.1-copyfile-policy-syml
FAQ
What is CVE-2026-100838?
CVE-2026-100838 is a vulnerability with a CVSS score of 8.1 (HIGH). Contrast is a confidential-computing runtime for Kubernetes. In versions before 1.19.1, the Kata agent policies generated by the Contrast CLI contained a flaw in the CopyFile verification that allowed...
How severe is CVE-2026-100838?
CVE-2026-100838 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-100838?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.