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CVE-2026-58053 is a critical privilege restriction bypass and container escape vulnerability in Gitea act_runner when using the Docker backend through act 0.262.0. The flaw arises because a workflow's container.options string is merged into the Docker job container HostConfig without adequately sanitizing dangerous runtime options. When act_runner is configured with privileged: false, it only forces the Docker Privileged flag to false, but still permits other security-sensitive options such as host PID namespace selection, added Linux capabilities, and relaxed security options to be applied unchanged. An attacker with permission to run a workflow on a Docker-backed runner can therefore create a job container with host namespaces and broad capabilities, defeating the intended container hardening and enabling escape from the container to the underlying host as root.
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A host container escape vulnerability in Gitea's act_runner caused by unsanitized Docker container options.
Серьезная уязвимость в Gitea act_runner с Docker-бэкендом, позволяющая пользователю, имеющему возможность запускать CI/CD workflow, обойти ограничения контейнера, выполнить container escape и получить root-доступ к хосту.
A critical container hardening bypass / container escape vulnerability in Gitea act_runner's Docker backend that lets a user with workflow execution privileges pass dangerous container.options values, escape the container, and gain root access on the host.
A critical container hardening bypass in Gitea act_runner using the Docker backend that can allow a workflow user to create a dangerous job container and escape to the host as root even when privileged mode is disabled.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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