{"id":"CVE-2026-100838","title":"Contrast is a confidential-computing runtime for Kubernetes","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 f…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-59"],"vendor":"edgelesssys","product":"contrast","affected":["contrast < 1.19.1"],"patched":["github.com/edgelesssys/contrast 1.19.1"],"published":"2026-09-27","updated":"2026-10-08","sourceUpdated":"2026-10-08T16:16:59.643","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100838","references":[{"url":"https://github.com/edgelesssys/contrast/security/advisories/GHSA-rh99-wc69-c255","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/contrast-before-1.19.1-copyfile-policy-symlink-subversion","label":"disclosure@vulncheck.com"},{"url":"https://github.com/kata-containers/kata-containers/security/advisories/GHSA-q49m-57vm-c8cc"},{"url":"https://gist.github.com/burgerdev/304dd0ab0fff1665b7c27e18a30cf96e"},{"url":"https://github.com/edgelesssys/contrast"},{"url":"https://github.com/edgelesssys/contrast/releases/tag/v1.19.1"}],"tags":["nvd","cve.org","osv","go"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-30T16:55:07.784619Z"},"epss":0.00221,"epssPercentile":0.12578,"aliases":["GHSA-rh99-wc69-c255","GO-2026-5624"],"ecosystem":"go","ingestedAt":"2026-09-27T02:41:45.571Z","slug":"CVE-2026-100838","body":"## Overview\n\nContrast 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'.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-100838)\n\nAffected packages:\n\n- `github.com/edgelesssys/contrast < 1.19.1`\n\nPatched in:\n\n- `github.com/edgelesssys/contrast 1.19.1`\n\nSource: https://osv.dev/vulnerability/GHSA-rh99-wc69-c255","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}