CVE-2026-85674

Summary

aider (aider-chat) automatically loads a .aider.conf.yml configuration file from the root of the git repository it is launched in. A crafted repository can set test-cmd (executed at startup) or lint-cmd (executed on the first file edit), which aider runs through a shell (subprocess with shell=True) without any user confirmation, LLM interaction, or API key. Consequently, a user who clones and runs aider inside an attacker-supplied repository achieves arbitrary command execution on their machine. The behavior is long-standing and was confirmed on 0.86.3.dev (current main).

Affected Software

Weaknesses

• CWE-94: Improper Control of Generation of Code ('Code Injection')

References

• https://github.com/Aider-AI/aider/issues/5254
• https://github.com/Aider-AI/aider
• https://github.com/Aider-AI/aider/blob/v0.86.2/aider/main.py
• https://www.vulncheck.com/advisories/aider-0.86.2-remote-code-execution-via-aider-conf-yml

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