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Docker disclosed a high-severity Docker Engine vulnerability, CVE-2026-34040 (CVSS 8.8), that allows attackers to bypass authorization plugins and perform actions that should be blocked. The flaw stems from an incomplete fix for CVE-2024-41110 and is triggered when a specially crafted oversized Docker API request causes the request body to be dropped before inspection by an AuthZ plugin. In affected environments, the plugin may approve container operations it would otherwise deny, opening a path to unauthorized privileged actions and potential host compromise.
Researchers said an attacker with Docker API access could exploit the bug by padding a container-creation request beyond 1 MB to launch a privileged container with access to the host filesystem, exposing sensitive assets such as AWS credentials, SSH keys, and Kubernetes configurations. The issue affects deployments that rely on authorization plugins inspecting request bodies, while environments not using those plugins are not impacted. Docker patched the vulnerability in Docker Engine 29.3.1 and urged defenders to upgrade, restrict Docker API access, avoid AuthZ plugins that depend on request-body inspection, and use controls such as rootless mode, user namespace remapping, and least-privilege access to reduce risk.
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Docker fixed the vulnerability in Docker Engine version 29.3.1. It also recommended mitigations including avoiding AuthZ plugins that depend on request-body inspection, restricting Docker API access, and using rootless mode or user namespace remapping to reduce impact.
Cyera Research Labs warned that AI coding agents operating in Docker-based sandboxes could be induced, or could independently infer how, to exploit CVE-2026-34040 and escalate access. This added a new exploitation scenario to the vulnerability's public understanding.
Reporting on the disclosure explained that an attacker with Docker API access could pad a container creation request beyond 1 MB to create a privileged container with host filesystem access. The described impact includes potential exposure of sensitive assets such as AWS credentials, SSH keys, and Kubernetes configuration data.
Docker disclosed a high-severity Docker Engine vulnerability, CVE-2026-34040 (CVSS 8.8), that allows authorization plugin bypass in certain configurations. The issue involves oversized API requests whose bodies are not properly forwarded to AuthZ plugins, enabling unauthorized actions and possible host compromise.
Docker's later advisory for CVE-2026-34040 states the new flaw stems from an incomplete fix for CVE-2024-41110, establishing the earlier remediation as the precursor event. No specific date for that earlier fix is provided in the references.
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Docker released security updates for **CVE-2024-41110**, a critical flaw in Docker Engine that can let attackers bypass authorization controls and potentially escalate privileges when **AuthZ authorization plugins** are enabled. The bug is a regression of an issue first addressed in 2019, but the earlier fix was not carried forward into newer Docker Engine releases starting with `19.03`, leaving later versions exposed. Docker Desktop installations are also affected through the bundled engine. The vulnerability can be exploited by sending a specially crafted Docker API request with `Content-Length: 0`, causing the daemon to pass the request to authorization plugins **without the request body** and potentially leading to incorrect allow decisions and command execution. Affected versions include Docker Engine before `23.0.14` and before `27.1.0`, and Docker Desktop before `4.33`; Mirantis Container Runtime and deployments not using AuthZ plugins are not impacted. Defenders were urged to update immediately or, if patching is not yet possible, disable AuthZ plugins and restrict Docker API access to trusted users and systems.
Jul 24, 2026
German authorities issued advisories for **multiple vulnerabilities in Docker** and a separate **Docker Desktop flaw that allows security measures to be bypassed**, highlighting security risks across both the container engine ecosystem and the desktop management platform. The notices identify Docker broadly as affected in one case, while the other specifically warns that Docker Desktop contains a vulnerability that could let attackers circumvent intended protections. The paired advisories indicate that organizations using Docker in development or production environments may face exposure from both general software weaknesses and a more targeted bypass issue in Docker Desktop. Security teams should review affected versions, assess where Docker and Docker Desktop are deployed, and prioritize vendor guidance and patching to reduce the risk of unauthorized access or weakened container security controls.
Jun 29, 2026
Palo Alto Networks Unit 42 reported that attackers are actively targeting **unsecured Docker daemons** exposed to the internet, using the Docker API to create and run malicious containers on victim systems. By abusing misconfigured deployments that lack proper access controls, intruders can gain effective control of the underlying host, execute arbitrary workloads, and use compromised infrastructure for follow-on activity such as cryptomining, persistence, and broader cloud or network compromise. The report details attacker tradecraft focused on exposed container management interfaces, where adversaries issue Docker commands remotely to pull attacker-controlled images and launch privileged containers that can interact with the host environment. The activity highlights a recurring cloud security risk: organizations that leave Docker services reachable without authentication can enable rapid compromise of containerized environments and the systems that support them.
Jul 12, 2026