Claude Code Heredoc Pipe Bypass Allows Reading Files Denied in Permission Settings

What this error means

Heredoc pipe bypass (<<EOF) allows reading files denied in permission settings — v2.1.141 regression of #48518 is a Claude Code failure pattern reported for developers trying to fix claude code heredoc marker bypassing file read permission settings. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

GitHub issue #58904 reports a regression of #48518 on v2.1.141. Heredoc markers allow bypassing permission settings for file reads. The original fix only addressed CPU freeze, not the permission bypass itself. Users confirmed reproduction on latest version.

Common causes

• A persistent security regression where heredoc markers (<<EOF or <<‘EOF’) allow Claude Code to read files that are explicitly denied in permission settings. The fix in v2.1.73 only addressed the CPU loop symptom, but the underlying permission bypass remains. Enterprise users relying on file access controls are affected.
• GitHub issue #58904 reports a regression of #48518 on v2.1.141. Heredoc markers allow bypassing permission settings for file reads. The original fix only addressed CPU freeze, not the permission bypass itself. Users confirmed reproduction on latest version.

Quick fixes

1. Confirm the exact error signature matches Heredoc pipe bypass (<<EOF) allows reading files denied in permission settings — v2.1.141 regression of #48518.
2. Check the Claude Code account, local tool state, and provider configuration involved in the failing workflow.
3. Compare the failing environment with a known working setup, then change one configuration value at a time.

Platform/tool-specific checks

• Verify the command, editor, extension, or API client that produced the error.
• Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
• Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

1. Capture the exact error message and the command, editor action, or request that triggered it.
2. Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
3. Review the source evidence below and compare it with your environment.
4. Apply one change at a time and rerun the smallest failing action.
5. Keep the working fix documented for the team or deployment environment.

How to prevent it

• Keep provider/tool configuration documented.
• Record non-secret diagnostics such as tool version, provider name, model name, and command path.
• Add a lightweight check before CI or production workflows depend on the tool.

Sources checked

• https://github.com/anthropics/claude-code/issues/58904

Evidence note: GitHub issue #58904 reports a regression of #48518 on v2.1.141. Heredoc markers allow bypassing permission settings for file reads. The original fix only addressed CPU freeze, not the permission bypass itself. Users confirmed reproduction on latest version.

Related errors

• claude code permission denied file access
• claude code heredoc CPU loop freeze

FAQ

What should I check first?

Start with the exact Heredoc pipe bypass (<<EOF) allows reading files denied in permission settings — v2.1.141 regression of #48518 text and the smallest action that reproduces it.

Can I ignore this error?

No. Treat it as a failed Claude Code workflow until the root cause is understood.

Is this guaranteed to have one fix?

No. The imported evidence supports the troubleshooting path above, but tool behavior can vary by account, plan, version, provider, and local configuration.

How do I know the fix worked?

Rerun the same command, editor action, or request. The fix is working when that action completes without Heredoc pipe bypass (<<EOF) allows reading files denied in permission settings — v2.1.141 regression of #48518.