{"cve":"CVE-2026-100838","nvd":{"published":"2026-09-27T02:17:22.083","modified":"2026-10-08T16:16:59.643","status":"Deferred","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'.","cvss_v4":{"vector":"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","score":8.6},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":8.1},"cwes":["CWE-59"],"references":["https://github.com/edgelesssys/contrast/security/advisories/GHSA-rh99-wc69-c255","https://www.vulncheck.com/advisories/contrast-before-1.19.1-copyfile-policy-symlink-subversion"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:48.555445741+00:00"},"epss":{"cve":"CVE-2026-100838","score":0.00221,"percentile":0.1254,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-rh99-wc69-c255","url":"https://osv.dev/vulnerability/GHSA-rh99-wc69-c255","summary":"Contras Affected by CopyFile Policy Subversion via Symlinks","modified":"2026-09-27T11:55:41.241107470Z","packages":[{"ecosystem":"Go","name":"github.com/edgelesssys/contrast","purl":"pkg:golang/github.com/edgelesssys/contrast","ranges":["<1.19.1"],"fixed":["1.19.1"]}]},{"id":"GO-2026-5624","url":"https://osv.dev/vulnerability/GO-2026-5624","summary":"Contras Affected by CopyFile Policy Subversion via Symlinks in github.com/edgelesssys/contrast","modified":"2026-09-27T11:55:41.241107470Z","packages":[{"ecosystem":"Go","name":"github.com/edgelesssys/contrast","purl":"pkg:golang/github.com/edgelesssys/contrast","ranges":["<1.19.1"],"fixed":["1.19.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}