CVE-2026-100838 Contrast confidential-computing runtime - Arbitrary File Write

Contrast confidential-computing runtime for Kubernetes < 1.19.1 contains an arbitrary file write vulnerability caused by flawed CopyFile verification in Kata agent policies, letting malicious host processes overwrite guest root filesystem files, exploit requires connection to Kata agent VSOCK.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.22% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Arbitrary File Write
Impact
File System Write, Information Disclosure
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
27 September 2026
Updated
15 October 2026
Weakness
CWE-59

Vendor fix

Upgrade to version 1.19.1 or apply the equivalent rego policy fix via 'contrast generate --policy'.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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