{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-50570: Fission: Incomplete capability denylist in Environment/Function PodSpec validation allows tenant-added CAP_SYS_TIME and cross-tenant node wall-clock corruption","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-50570","status":"final","version":"1","initial_release_date":"2026-06-10T17:34:14.910Z","current_release_date":"2026-06-10T18:37:36.661Z","revision_history":[{"date":"2026-06-10T17:34:14.910Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.25.0, Fission added PodSpec safety validation for tenant-facing Environment and Function CRDs (ValidatePodSpecSafety / ValidateContainerSafety admission webhook + sanitizeContainerSecurityContext executor merge layer), but the capability check was implemented as a fixed denylist of six Linux capabilities (SYS_ADMIN, NET_ADMIN, SYS_PTRACE, SYS_MODULE, DAC_READ_SEARCH, DAC_OVERRIDE). The denylist omitted CAP_SYS_TIME, among others. As a result, a tenant who could create a Function or Environment CRD could request securityContext.capabilities.add: [\"SYS_TIME\"], pass Fission's admission validation and merge-layer sanitization, and run attacker-controlled code with CAP_SYS_TIME in the resulting function or runtime container. This issue has been patched in version 1.25.0.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-50570 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-50570"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-50570"},{"category":"external","summary":"https://github.com/fission/fission/security/advisories/GHSA-qf5v-m7p4-95rp","url":"https://github.com/fission/fission/security/advisories/GHSA-qf5v-m7p4-95rp"},{"category":"external","summary":"https://github.com/fission/fission/pull/3465","url":"https://github.com/fission/fission/pull/3465"},{"category":"external","summary":"https://github.com/fission/fission/releases/tag/v1.25.0","url":"https://github.com/fission/fission/releases/tag/v1.25.0"}]},"product_tree":{"branches":[{"category":"vendor","name":"fission","branches":[{"category":"product_name","name":"fission","branches":[{"category":"product_version","name":"< 1.25.0","product":{"name":"fission fission < 1.25.0","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:fission:fission:\\<_1.25.0:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-50570","title":"Fission: Incomplete capability denylist in Environment/Function PodSpec validation allows tenant-added CAP_SYS_TIME and cross-tenant node wall-clock corruption","notes":[{"category":"description","text":"Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes. Prior to version 1.25.0, Fission added PodSpec safety validation for tenant-facing Environment and Function CRDs (ValidatePodSpecSafety / ValidateContainerSafety admission webhook + sanitizeContainerSecurityContext executor merge layer), but the capability check was implemented as a fixed denylist of six Linux capabilities (SYS_ADMIN, NET_ADMIN, SYS_PTRACE, SYS_MODULE, DAC_READ_SEARCH, DAC_OVERRIDE). The denylist omitted CAP_SYS_TIME, among others. As a result, a tenant who could create a Function or Environment CRD could request securityContext.capabilities.add: [\"SYS_TIME\"], pass Fission's admission validation and merge-layer sanitization, and run attacker-controlled code with CAP_SYS_TIME in the resulting function or runtime container. This issue has been patched in version 1.25.0.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L","baseScore":8.5,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}