gemini-cli - 💡(How to fix) Fix Incomplete Host Header Validation [1 comments, 2 participants]

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google-gemini/gemini-cli#26830Fetched 2026-05-11 03:27:13
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What happened?

The IDE Server checks the Host header against localhost and 127.0.0.1, but it doesn't account for other potential aliases or IPv6 addresses (e.g., [::1]).

What did you expect to happen?

Host validation should be robust against all local loopback aliases to prevent DNS rebinding attacks.

Client Information

<details> <summary>Client Information</summary>

OS: linux Date: Sunday, May 10, 2026 Gemini CLI: 0.42.0-nightly

</details>

Login information

Automated audit with Gemini CLI.

Anything else we need to know?

File: packages/vscode-ide-companion/src/ide-server.ts, Lines 150-157. An attacker might bypass this check using alternative local hostnames.

Severity: Low Area: area/security

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gemini-cli - 💡(How to fix) Fix Incomplete Host Header Validation [1 comments, 2 participants]