TI-2026-64976 Aliases CVE-2026-100838 GHSA-h734-rggh-79xq

Contrast before 1.19.1 CopyFile Policy Symlink Subversion

LOW 39CWE-59Published 2026-09-27 · Updated 2026-10-08

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

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'.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00221 12th percentileScored 2026-11-07

Fix Fixed contrast (edgelesssys): 1.19.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
edgelesssys	contrast	before 1.19.1	1.19.1	Patch available	CNA

contrast Vendoredgelesssys Affected before 1.19.1 Fixed in 1.19.1 Patch available CNA

Remediation

Fix · CNA contrast (edgelesssys) Fixed in 1.19.1

Timeline

2026-10-02 Threatist record created from CVE-2026-100838
2026-10-03 Alias added: GHSA-h734-rggh-79xq

References

Advisory 1

GitHub Security Advisory (GHSA-rh99-wc69-c255)

TI-2026-64974 Edgeless Systems Contrast through 1.20.0 Denial of Service via ciphertextContainer CVSS 4.0MEDIUM 5.3
TI-2026-64973 Contrast before 1.16.0 Remote Attestation Relay Attack CVSS 4.0CRITICAL 9.1
TI-2026-64971 Contrast before 1.23.1 Image Substitution via Policy Generation CVSS 4.0HIGH 8.6
TI-2026-71174 Contrast world-writable containerd config allows privilege escalation CVSS 4.0HIGH 8.5
TI-2025-43536 Contrast before 1.8.1 Information Disclosure via Logging CVSS 4.0HIGH 8.5
TI-2025-43534 Edgelesssys Contrast before 1.12.2 Workload Secrets Information Disclosure CVSS 4.0HIGH 8.5

See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences