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ASSET Research Group · July 10, 2026

GhostCommit: Hiding Prompt Injection in Images to Evade AI Code Review

analysis Prompt InjectionAgent SecurityAI Red Teaming
Why it matters

ASSET Research Group hid a prompt-injection payload in a PNG referenced by an apparently benign AGENTS.md file. Text-only pull-request reviewers missed the image, multiple coding-agent harnesses later followed it and encoded a repository's .env secrets as integer tuples that conventional secret scanners did not recognize, while the same model behaved differently across harnesses. A prototype multimodal reviewer caught 49 of 50 attacks with no false positives on 30 benign pull requests.

My takeaway: Review every agent-readable artifact, including images and instruction files, before merge; treat repository policy files as executable control inputs; decode non-string data flows in secret scanning; and test model-plus-harness combinations because wrapper behavior can dominate model behavior.
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