edgeless systems Contrast up to 1.19.0 CopyFile Verification out-of-bounds write

Summaryinfo

A vulnerability classified as critical has been found in edgeless systems Contrast up to 1.19.0. Affected by this vulnerability is an unknown functionality of the component CopyFile Verification. This manipulation causes out-of-bounds write. This vulnerability appears as CVE-2026-100838. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in edgeless systems Contrast up to 1.19.0 and classified as critical. Affected by this vulnerability is some unknown processing of the component CopyFile Verification. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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'.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-100838 since 09/27/2026. The exploitation appears to be easy. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

Upgrading to version 1.19.1 eliminates this vulnerability.

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Productinfo

Vendor

• edgeless systems

Name

• Contrast

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19.0

CPE 2.3info

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• 🔒
• 🔒

CPE 2.2info

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• 🔒
• 🔒

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