CVE-2026-100838
Contrast before 1.19.1 CopyFile Policy Symlink Subversion
- State
- Published
- Severity
- 8.6 High
- Published
- Sep 27, 2026
- Updated
- Oct 8, 2026
- Reserved
- Sep 26, 2026
Description
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'.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.6 High | 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 | VulnCheck |
| 3.1 | 8.1 High | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | VulnCheck |
Weaknesses
- CWE-59 Improper Link Resolution Before File Access ('Link Following')
Affected Products
| Product | Versions |
|---|---|
contrastedgelesssys |
|
References
- GitHub Security Advisory (GHSA-rh99-wc69-c255)vendor-advisory
- VulnCheck Advisory: Contrast before 1.19.1 CopyFile Policy Symlink Subversionthird-party-advisory
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