{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-58053: Gitea act_runner - Container Hardening Bypass via Workflow Container Options","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-58053","status":"final","version":"1","initial_release_date":"2026-06-28T01:32:55.648Z","current_release_date":"2026-06-28T01:32:55.648Z","revision_history":[{"date":"2026-06-28T01:32:55.648Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Gitea act_runner with the Docker backend (through act 0.262.0) passes a workflow's container.options string to the Docker job container's HostConfig and, when configured with privileged: false, forces only the Privileged flag off while merging options such as --pid=host, --cap-add, and --security-opt unchanged. A user who can run a workflow on a Docker-backed runner can create a job container with host namespaces and broad capabilities and escape to the host as root despite privileged mode being disabled.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-58053 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-58053"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-58053"},{"category":"external","summary":"Proof of Concept","url":"https://github.com/bikini/exploitarium/tree/main/gitea-act-runner-container-options-poc"},{"category":"external","summary":"VulnCheck Advisory: Gitea act_runner - Container Hardening Bypass via Workflow Container Options","url":"https://www.vulncheck.com/advisories/gitea-act-runner-container-hardening-bypass-via-workflow-container-options"}]},"product_tree":{"branches":[{"category":"vendor","name":"Gitea","branches":[{"category":"product_name","name":"act_runner","branches":[{"category":"product_version_range","name":"<=0.262.0","product":{"name":"Gitea act_runner <=0.262.0","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:gitea:act_runner:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-58053","title":"Gitea act_runner - Container Hardening Bypass via Workflow Container Options","notes":[{"category":"description","text":"Gitea act_runner with the Docker backend (through act 0.262.0) passes a workflow's container.options string to the Docker job container's HostConfig and, when configured with privileged: false, forces only the Privileged flag off while merging options such as --pid=host, --cap-add, and --security-opt unchanged. A user who can run a workflow on a Docker-backed runner can create a job container with host namespaces and broad capabilities and escape to the host as root despite privileged mode being disabled.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","baseScore":9.4,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}