Anthropic Patches Claude Code Bypass Vulnerability
Anthropic patched a critical security flaw in its Claude Code agent on April 6, 2026, after researchers reported a command-parser bug that silently bypassed developer-configured deny rules. The vulnerability let attackers hide a malicious 51st subcommand past a hard-coded 50-subcommand limit, risking exfiltration of SSH keys and API tokens in CI environments. Anthropic released Claude Code v2.1.90 to restore proper deny-rule enforcement.
Scoring Rationale
High-impact disclosure with an official patch (v2.1.90) and clear mitigation steps. Scored high for novelty, credibility, and direct actionability; slightly limited because it primarily affects Claude Code users rather than the entire industry.
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Sources
- Read OriginalCritical Claude Code Flaw Silently Bypasses User-Configured Security Rulesgbhackers.com
