Claw Chain Vulnerabilities in OpenClaw CVE-2026-44112 (CVSS 9.6)

Four OpenClaw Flaws Enable Data Theft, Privilege Escalation, and Persistence: Analyzing CVE-2026-44112 (CVSS 9.6), CVE-2026-44113 (CVSS 7.7), CVE-2026-44115 (CVSS 8.8), and CVE-2026-44118 (CVSS 7.8)

Introduction

Cybersecurity researchers have uncovered a series of four critical security flaws in OpenClaw, called the "Claw Chain" vulnerabilities. These issues, identified as CVE-2026-44112, CVE-2026-44113, CVE-2026-44115, and CVE-2026-44118, can be chained to enable data theft, privilege escalation, and persistent control over compromised systems. The discovery shows the difficulties in securing modern software agents in managed environments.

The "Claw Chain" vulnerabilities demonstrate how separate weaknesses can combine to create a strong attack path, allowing adversaries to bypass sandbox restrictions, exfiltrate sensitive data, and embed backdoors. Organizations using OpenClaw deployments face these risks, which can weaken core security controls. Understanding these flaws is key to creating effective mitigation strategies.

This analysis details the technical underpinnings of each vulnerability, their potential for exploitation, and the necessary steps to secure affected systems. Addressing these vulnerabilities requires immediate action to prevent unauthorized access and maintain system integrity. This shows the need for cyber threat intelligence platform capabilities.

What are the OpenClaw "Claw Chain" Vulnerabilities and Why are They Critical?

The "Claw Chain" consists of four distinct, yet chainable, vulnerabilities in OpenClaw that enable a multi-stage attack leading to full system compromise. These flaws individually possess high to medium CVSS scores, indicating their severity, but their severity increases with sequential exploitation. They allow an attacker to move from initial code execution within a sandbox to achieving owner-level control and persistence.

These flaws are critical because they undermine core security controls. Each vulnerability targets a specific weakness, ranging from race conditions in sandbox environments to improper access validation. Here is a breakdown of each vulnerability:

• CVE-2026-44112 (CVSS: 9.6/6.3): A time-of-check/time-of-use (TOCTOU) race condition vulnerability in the OpenShell managed sandbox backend. This flaw allows an attacker to bypass sandbox restrictions and redirect write operations outside their intended root directory.
• CVE-2026-44113 (CVSS: 7.7/6.3): Another TOCTOU race condition vulnerability within OpenShell. Similar to CVE-2026-44112, this vulnerability allows bypassing sandbox restrictions and reading files outside the designated mount root.
• CVE-2026-44115 (CVSS: 8.8): An incomplete list of disallowed inputs vulnerability. This allows attackers to bypass allowlist validation by embedding shell expansion tokens within a here document (heredoc) body. This technique enables the execution of unapproved commands at runtime, expanding an attacker's capabilities within the environment.
• CVE-2026-44118 (CVSS: 7.8): An improper access control vulnerability. This flaw enables non-owner loopback clients to impersonate an owner, thereby raising their privileges. This can grant control over gateway configuration, cron scheduling, and execution environment management, allowing extensive manipulation of the compromised system.

These vulnerabilities expose sensitive data, enable privilege escalation, and allow persistent control, making them a serious concern for any organization relying on OpenClaw.

Exploitation and Impact of the "Claw Chain"

The exploitation chain involving the OpenClaw flaws demonstrates a methodical approach to system compromise, moving through several stages to gain deep penetration and persistent access. This sequence allows an adversary to use initial access to gain full control, making breach detection challenging due to the actions mimicking legitimate system behavior.

The attack unfolds in four steps:

1. Initial Foothold and Code Execution: An attacker gains initial code execution within the OpenShell sandbox. This could be achieved via a malicious plugin, a prompt injection attack, or through compromised external input channels feeding into the OpenClaw agent.
2. Data Exposure: With initial sandbox access, the attacker uses CVE-2026-44113 and CVE-2026-44115. CVE-2026-44113 allows for reading sensitive files, including system files, credentials, and internal artifacts, by bypassing sandbox read restrictions. At the same time, CVE-2026-44115 enables the execution of unapproved commands by embedding shell expansion tokens in heredoc bodies. This aids in credential and secret exposure. This can lead to data theft, similar to risks from vulnerabilities like the Oracle EBS CVE-2025-61884 flaw, which also permitted unauthenticated data access.
3. Privilege Escalation: Following data exposure, CVE-2026-44118 is exploited to obtain owner-level control of the agent runtime. This improper access control vulnerability permits non-owner loopback clients to impersonate an owner by misusing a client-controlled ownership flag. Owner-level control grants the attacker extensive privileges, including manipulating core system configurations.
4. Persistence and Control: The final stage uses CVE-2026-44112 to establish persistence. This vulnerability, a TOCTOU race condition, allows the attacker to redirect write operations outside the sandbox's intended root. This enables the planting of backdoors, tampering with configuration files, or making other system changes to maintain persistent control over the compromised host. Establishing persistent access is a common tactic, as seen in cases like the CISA Firestarter Cisco backdoor, where a persistent mechanism allowed continued unauthorized access.

These chained vulnerabilities have a substantial combined impact. Adversaries can move through data access, privilege escalation, and persistence, turning the agent into their tool. This makes detection difficult for traditional security controls, as the attacker's actions often resemble normal agent behavior, and broadens the potential blast radius. Supply-chain risk monitoring is important, as compromised components like OpenClaw agents can introduce widespread vulnerabilities. Organizations might consider dark web monitoring service or underground forum intelligence to track discussions and potential weaponization of such exploits.

Understanding the Root Causes and Technical Mechanisms

Examining the root causes for each OpenClaw vulnerability reveals critical design and implementation flaws that adversaries can exploit. Understanding these mechanisms helps in effective mitigation and in preventing similar vulnerabilities in future software development.

TOCTOU Race Conditions in OpenShell (CVE-2026-44112 - CVE-2026-44113)

Both CVE-2026-44112 (write redirection) and CVE-2026-44113 (read redirection) stem from a Time-of-Check/Time-of-Use (TOCTOU) race condition in the OpenShell managed sandbox backend. A TOCTOU vulnerability occurs when a program checks for a condition (e.g., file permissions or path validity) at one point in time, but then uses the result of that check later, by which time the condition may have changed.

For OpenShell:

• For CVE-2026-44112, the system likely checks if a file path is within the allowed sandbox root before a write operation. However, during the brief interval between this check and the actual write, an attacker could manipulate the file path using symbolic links or other file system tricks. This redirection would cause the write operation to occur outside the intended sandbox boundaries, allowing configuration tampering or backdoor planting.
• For CVE-2026-44113, a similar race condition applies to read operations. An attacker could trick the sandbox into reading sensitive system files, credentials, or internal artifacts by swapping a legitimate path with a malicious one after the initial security check. This grants unauthorized access to data that should be isolated within the sandbox. These flaws show the inherent difficulties in securing dynamic execution environments, where precise timing and resource management are critical.

Incomplete Disallowed Inputs and Shell Expansion (CVE-2026-44115)

CVE-2026-44115 is an incomplete list of disallowed inputs vulnerability. This issue arises from insufficient validation of user-supplied input, specifically allowing shell expansion tokens to be embedded within a here document (heredoc) body. Heredocs are typically used to pass multi-line strings as input to commands.

The vulnerability means that the allowlist, intended to restrict commands and arguments, failed to account for shell expansion mechanisms. By embedding tokens like $() or ` ` within a heredoc, an attacker can bypass the allowlist and execute arbitrary commands. This transforms a data input field into a command injection vector, giving the attacker arbitrary code execution capabilities within the OpenClaw agent. This type of vulnerability shows the need for complete input validation that accounts for all possible methods of command injection and evasion, not just simple string matching.

CVE-2026-44118 is an improper access control vulnerability that allows non-owner loopback clients to impersonate an owner. This flaw stems from OpenClaw's reliance on a client-controlled ownership flag, senderIsOwner. The system trusts this flag to determine if the caller is authorized for owner-only tools without properly validating it against the authenticated session.

An unprivileged client could simply declare itself as an "owner" by manipulating this flag in its request. Because the system did not perform a server-side validation of the senderIsOwner flag against the actual authenticated session, it would incorrectly grant owner-level privileges. This bypasses the intended authorization mechanisms, enabling an attacker to gain control over critical functions such as:

• Update to OpenClaw version 2026.4.22: This version includes fixes for all four "Claw Chain" vulnerabilities: CVE-2026-44112, CVE-2026-44113, CVE-2026-44115, and CVE-2026-44118.
• Specific Fixes Implemented:
• For CVE-2026-44118 (improper access control), the MCP loopback runtime now issues separate owner and non-owner bearer tokens. The senderIsOwner attribute is now exclusively derived from which token authenticated the request. The spoofable sender-owner header is no longer emitted or trusted, preventing unauthorized privilege escalation.
• For the TOCTOU race conditions in CVE-2026-44112 and CVE-2026-44113, the fixes likely involve strengthening the atomic operations or applying stricter validation and locking mechanisms to ensure that checks and uses are synchronized and that paths cannot be tampered with in the interim.
• For CVE-2026-44115 (incomplete disallowed inputs), updates address the allowlist validation to correctly identify and block shell expansion tokens within heredoc bodies, preventing arbitrary command execution.

Beyond patching, organizations should use a complete security approach to minimize the risk of similar vulnerabilities and detect potential exploitation. The impact of such chained vulnerabilities shows the need for strong cyber threat intelligence platform solutions.

• Regular Patch Management: Establish a consistent and expedited patching schedule for all software, especially critical components like OpenClaw agents. Prompt application of security updates is essential.
• Principle of Least Privilege: Ensure that OpenClaw agents and any associated processes operate with the minimum necessary permissions. Restricting privileges can limit the impact of a successful exploitation, even if an attacker manages to execute code. This also applies to user accounts interacting with the system.
• Input Validation and Sanitization: Implement rigorous input validation across all interfaces to prevent command injection, shell expansion, and other forms of malicious input. This involves checking for known disallowed characters and understanding how different parsing engines might interpret input.
• Enhanced Monitoring and Logging: Use complete logging and breach detection capabilities to monitor the behavior of OpenClaw agents and their interactions with the system. Look for anomalous activities, such as attempts to write to unusual directories, unexpected command executions, or privilege changes. Solutions offering real-time ransomware intelligence can provide indicators of compromise related to data manipulation or unauthorized access.
• Sandbox Configuration Review: Regularly review and harden sandbox configurations for OpenShell or similar environments. Ensure that sandbox escape mechanisms are thoroughly tested and that there are no remaining TOCTOU vulnerabilities or path traversal issues.
• Supply Chain Security: Use supply-chain risk monitoring to assess the security position of third-party software components and dependencies, including the OpenClaw agent itself. A vulnerability in one component can cascade through the entire system, as seen with this "Claw Chain" exploit. This shows broader challenges in securing software supply chains, a topic explored in discussions around important vulnerabilities like the Fragnesia Linux kernel LPE, which also shows the dangers of privilege escalation in core system components.

• The "Claw Chain" vulnerabilities (CVE-2026-44112, CVE-2026-44113, CVE-2026-44115, CVE-2026-44118) in OpenClaw enable a multi-stage attack for data theft, privilege escalation, and persistence.
• CVE-2026-44112 (CVSS 9.6) and CVE-2026-44113 (CVSS 7.7) are TOCTOU race conditions allowing sandbox bypass for writes and reads, respectively.
• CVE-2026-44115 (CVSS 8.8) is an incomplete allowlist vulnerability permitting arbitrary command execution via shell expansion tokens in heredocs.
• CVE-2026-44118 (CVSS 7.8) is an improper access control flaw allowing privilege escalation by spoofing a client-controlled owner flag.
• Successful exploitation allows attackers to expose credentials, gain owner-level control, and plant backdoors, with actions often appearing as normal agent behavior.
• Immediate patching to OpenClaw version 2026.4.22 is the primary mitigation, which addresses all four flaws, including fixing the senderIsOwner flag validation.