Is CVE-2026-100838 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-100838 being exploited in the wild.

How severe is CVE-2026-100838?

High severity, with a CVSS score of 8.1, published 27 September 2026.

Which products and versions are affected?

Edgeless Systems Contrast before 1.19.1.

Is there a fix for CVE-2026-100838?

A patch was published on 2026-04-23: Version 1.19.1 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-100838 attacked?

It is attacked from the adjacent network.

Am I affected by CVE-2026-100838?

Check whether you run Edgeless Systems Contrast at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-100838: Edgeless Systems Contrast arbitrary filesystem write in CopyFile policy

CVE-2026-100838 · Severity: high · CVSS 8.1 · Published 2026-09-27

Contrast is a confidential-computing runtime that protects containerized workloads in Kubernetes by isolating them from the host. A flaw in versions before 1.19.1 allows a malicious process on the host to write arbitrary files to the guest filesystem and access sensitive data, resulting in complete compromise of the isolated workload. This enables attackers to steal secrets or modify applications running inside the protected container.

Technologies: Edgeless Systems Contrast. Vendors: Edgeless Systems.

Quick answers

Is CVE-2026-100838 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-100838 being exploited in the wild.
How severe is CVE-2026-100838?: High severity, with a CVSS score of 8.1, published 27 September 2026.
Which products and versions are affected?: Edgeless Systems Contrast before 1.19.1.
Is there a fix for CVE-2026-100838?: A patch was published on 2026-04-23: Version 1.19.1 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-100838 attacked?: It is attacked from the adjacent network.
Am I affected by CVE-2026-100838?: Check whether you run Edgeless Systems Contrast at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The Kata agent policies generated by the Contrast CLI contained improper symlink resolution in CopyFile verification (CWE-59), allowing arbitrary writes to the guest root filesystem. An attacker with VSOCK connectivity to the Kata agent (no authentication required) can issue crafted CopyFile requests to overwrite security-critical files or exfiltrate sensitive data. The fix is available in version 1.19.1, with a policy-only workaround available for users unable to upgrade immediately.

Affected products

Edgeless Systems Contrast before 1.19.1

Timeline

2026-09-27: disclosed
2026-04-23: patched: Version 1.19.1 released

References

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