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AI coding agents plugin pinning bypass security flaw

Vulnerability
First reported
Last updated
Happening score
H score 60
1 unique sources, 1 articles

Summary

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Plugin pinning bypass in four AI coding agents lets a repository owner swap a supposedly reviewed plugin for malicious code, turning a trusted add-on into a code-execution path. The swapped plugin can reach files, saved credentials, and the systems the user can log in to. Anthropic patched Claude Code 2.1.179 and OpenAI patched Codex 0.146.0, while GitHub Copilot has no fix and Gemini CLI will not be patched.

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Technical Analysis
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Timeline

  1. 18.09.2026 14:01 2 articles · 3d ago

    Air Security reports plugin pinning bypass in four AI coding agents

    Initial Disclosure

    Air Security said a flaw in four AI coding agents lets a plugin repository owner swap a locked plugin for malicious code by making a branch or repository name mimic a commit SHA or FETCH_HEAD, allowing the replaced plugin to access the user's files, saved credentials, and logged-in systems. Air said it built a working test attack in May and notified vendors in June; as of September 18, Anthropic had patched Claude Code 2.1.179, OpenAI had patched Codex 0.146.0, GitHub Copilot had no fix, and Google would not patch Gemini CLI.

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