{"schema":"threatline.record/2","record":{"id":"CVE-2026-100838","aliases":["GHSA-rh99-wc69-c255","GO-2026-5624"],"summary":"Contrast before 1.19.1 CopyFile Policy Symlink Subversion","details":"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'.","categories":["Libraries & packages"],"product":"contrast","vendor":"edgelesssys","ecosystem":"Go","affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-100838","source_modified_at":"2026-10-08T15:22:00.652Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"contrast","vendor":"edgelesssys","versions":[{"lessThan":"1.19.1","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"1.19.1","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-rh99-wc69-c255","source_modified_at":"2026-09-27T11:55:41.241107470Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"github.com/edgelesssys/contrast","ecosystem":"Go","purl":"pkg:golang/github.com/edgelesssys/contrast"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.19.1"}]}],"versions":[]}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-100838","source_modified_at":"2026-10-08T15:22:00.652Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"contrast","ecosystem":null},"version":"1.19.1","basis":"first unaffected version stated in the CVE record"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-rh99-wc69-c255","source_modified_at":"2026-09-27T11:55:41.241107470Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"github.com/edgelesssys/contrast","ecosystem":"Go","purl":"pkg:golang/github.com/edgelesssys/contrast"},"version":"1.19.1"}],"cvss":8.6,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00221,"percentile":0.11987,"score_date":"2026-10-23"},"published_at":"2026-09-27T01:28:35.498Z","modified_at":"2026-10-08T15:22:00.652Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-100838","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-08T15:22:00.652Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-rh99-wc69-c255","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-27T11:55:41.241107470Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-100838","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","OSV","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/edgelesssys/contrast/security/advisories/GHSA-rh99-wc69-c255","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/contrast-before-1.19.1-copyfile-policy-symlink-subversion","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-09-30T16:55:07.784619Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-08T15:22:00.652Z","content_hash":"db368cb47b577c30a612c6b09fc2ec1b1918d4ed3aeee49df64b13dc66ae4ab9"}}