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AWS Kiro: Arbitrary Code Execution via Indirect Prompt Injection

Researchers found a vulnerability (CVE-2026-10591) in AWS Kiro, an agentic IDE, where hidden instructions planted in a web page or source file that Kiro processes can trigger indirect prompt injection to rewrite Kiro's own MCP server configuration (~/.kiro/settings/mcp.json) or allowlist arbitrary Bash commands in .vscode/settings.json, achieving arbitrary code execution on the developer's machine with no approval prompt. The human-in-the-loop approval boundary is bypassed because Kiro can write to these config files without user consent, and AWS has issued a fix and CVE.

indirect-prompt-injection · prompt-injection · remote-code-execution · tool-abuse · config-poisoning
ai-agents · mcp · llm · agentic-ide

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Stealing Reasoning Traces from Proprietary LLM APIs

A paper titled "Stealing Reasoning Traces from Proprietary LLM APIs" and a reproduction by embracethered describe an attack that recovers encrypted LLM chain-of-thought blobs by replaying them to a weaker, easier-to-jailbreak model from the same provider, which then decodes and outputs the hidden reasoning in plaintext. The technique exploits the interchangeability of encrypted reasoning blocks across sessions, users, and models at OpenAI, Anthropic, and Google; the researchers decoded 315,320 scraped reasoning blocks to recover 367 PII artifacts and 182 credentials, and the blogger reproduced the attack against OpenAI's GPT-5.6. Details →

Stealing Reasoning Traces from Proprietary LLM APIs

Researchers in the paper "Stealing Reasoning Traces from Proprietary LLM APIs" (arXiv:2608.09867) show that encrypted chain-of-thought reasoning blocks returned by OpenAI, Anthropic, and Google reasoning APIs are interchangeable across sessions, users, and models within a provider ecosystem. By injecting a stronger model's encrypted reasoning trace into a weaker, less-safeguarded model in the same family, they force it to decode the trace verbatim, enabling four attack vectors: circumventing anti-distillation protections, extracting private data (recovering 367 PII artifacts and 182 credentials from 315,320 decoded blocks scraped from public repos), revealing hazardous content hidden behind safe answers, and embedding invisible prompt injections in opaque blocks. Details →
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