CVE-2026-73614 in Network-AI
Summary
by MITRE • 08/13/2026
Network-AI ClaudeHookBridge before 5.15.1 truncates the target string to 500 characters before evaluating denyPatterns, while Claude Code executes the full untruncated command. Attackers can position dangerous content past byte 500 in a Bash command field to bypass the operator's hard-deny list and execute arbitrary commands.
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Analysis
by VulDB Data Team • 08/13/2026
The vulnerability in Network-AI ClaudeHookBridge versions prior to 5.15.1 represents a critical security flaw that stems from inconsistent string handling between different components of the system. This issue manifests as a truncation behavior that affects the evaluation of denyPatterns, creating a significant bypass opportunity for malicious actors. The system truncates target strings to exactly 500 characters before processing denyPatterns, while the underlying Claude Code execution engine processes the complete untruncated command. This fundamental inconsistency creates a dangerous gap in the security posture where attackers can craft malicious input that appears benign when truncated but becomes destructive when fully executed.
The technical implementation of this vulnerability leverages the specific truncation point at 500 bytes to position harmful command content beyond the detection scope of the hard-deny list. When an attacker crafts a bash command with malicious payload beginning after the 500-byte mark, the system's deny pattern evaluation operates on only the first 500 characters, failing to detect the dangerous code that follows. This creates a scenario where legitimate security controls are circumvented because the system's validation logic does not account for the possibility that malicious content might exist beyond the truncation boundary. The flaw essentially enables attackers to bypass input sanitization and command filtering mechanisms through strategic placement of malicious code.
The operational impact of this vulnerability extends far beyond simple command injection, as it represents a complete breakdown in the security controls designed to prevent arbitrary command execution. Attackers can exploit this weakness to execute any command that would otherwise be blocked by the deny patterns, potentially leading to full system compromise, data exfiltration, or persistent backdoor installation. The vulnerability affects the integrity of the entire command processing pipeline since it undermines the fundamental assumption that deny patterns provide comprehensive protection against known malicious commands. This bypass capability transforms what should be a controlled execution environment into one where attackers can effectively subvert security policies through careful manipulation of input structure.
Mitigation strategies for this vulnerability must address both the immediate truncation issue and the broader architectural concern of inconsistent validation across system components. The primary solution involves updating ClaudeHookBridge to version 5.15.1 or later, which implements consistent string handling that processes the complete target string for deny pattern evaluation. Organizations should also implement additional defensive measures including input length validation, more robust command parsing with proper escaping mechanisms, and comprehensive logging of all command executions. The vulnerability aligns with CWE-1287, which addresses the issue of truncation leading to security flaws, and represents a specific variant of command injection where bypass techniques leverage inconsistent data handling between system components. From an ATT&CK framework perspective, this vulnerability maps to T1059.004 (Unix Shell) and T1566 (Phishing), as it enables attackers to execute arbitrary commands through shell-based interfaces while potentially circumventing existing security controls that would normally block such activities.