Wednesday, October 28, 2026 · No. 27Published by HJITM · 한국어 ·

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Vulnerabilities & Jailbreaks

OpenAI Compaction Flaw Allows Researchers to Extract Hidden Reasoning

Original headline: OpenAI Compaction Flaw Let Researchers Bypass Hidden Reasoning Protections

Security firm Xint demonstrated that a flaw in OpenAI’s compaction feature can be leveraged to copy a model’s hidden reasoning in plain text. The compaction function, which compresses long conversations to save space, normally returns encrypted reasoning that users cannot read, but the exploit bypasses this protection.

Exposure of hidden reasoning could undermine defenses against prompt injection and jailbreak attacks.

Research angleHow does the exposure of hidden reasoning in AI models affect user trust? — Trust Theory

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