CVE-2026-53806: OpenClaw < 2026.5.12 - Shell Option Parsing Bypass in Exec Revalidation

Synopsis

A shell option parsing bypass in OpenClaw allows an authenticated attacker to sidestep exec revalidation by supplying combined POSIX shell flags, which the allowlist validation logic fails to decompose and check correctly. The vulnerability is reachable over the network, requires a low-privilege account, and needs no interaction from another user or process. Successful exploitation enables unauthorized command execution inside the container or host environment running the affected OpenClaw version. A patched-image rebuild at version 2026.5.12 is available on HarborGuard for environments running an affected version.

HarborGuard Coverage

Exploit Conditions

• Network reachabilityRequired

  The vulnerable service must be reachable over the network; an attacker sends crafted shell-flag input to the exposed endpoint to trigger the parsing bypass.

• AuthenticationRequired

  A low-privilege account is sufficient; any authenticated user who can submit shell option arguments to the exec revalidation path can attempt exploitation.

• Victim interactionNot required

  No action from another user or process is needed; the attacker interacts directly with the service.

• Attack complexityDetail

  Base complexity is low, meaning the exploit does not depend on race conditions or specific memory layout, though the attack target condition (AT:P) indicates a prerequisite environmental state must be present for exploitation to succeed.

Blast Radius

• A successful attacker executes arbitrary shell commands in the context of the OpenClaw process, bypassing the configured allowlist entirely.
• Confidential data accessible to that process, including secrets, credentials, and application state, is readable by the attacker.
• The attacker can write or overwrite files and data within the process's reach, modifying application behavior or persisted records.
• The service itself can be crashed or rendered unavailable, interrupting workloads that depend on it.