CVE-2026-100838
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Summary
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'.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| edgelesssys | contrast | 0 < 1.19.1 | affected |
| edgelesssys | contrast | 1.19.1 | unaffected |
Weaknesses
- CWE-59: Improper Link Resolution Before File Access ('Link Following')
References
- https://github.com/edgelesssys/contrast/security/advisories/GHSA-rh99-wc69-c255
- https://www.vulncheck.com/advisories/contrast-before-1.19.1-copyfile-policy-symlink-subversion
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.