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Research

LLMs Vulnerable to Chain-of-Thought Forgery Attacks

MIT Technology Review AI·July 30, 2026·high confidence

Why it matters

  • →The discovery highlights a fundamental security flaw in LLMs that could be exploited in sensitive applications.
  • →Current training methods may not be sufficient to prevent these types of attacks, posing a challenge for AI safety.
  • →Understanding this vulnerability is crucial for developing more robust defenses against potential misuse of AI models.
LLMs Vulnerable to Chain-of-Thought Forgery Attacks
©MIT Technology Review AI

Researchers have identified a fundamental flaw in large language models (LLMs) that makes them vulnerable to chain-of-thought forgery attacks. This flaw allows attackers to trick LLMs into executing harmful instructions by mimicking the models' internal thought processes. The study, presented at the International Conference on Machine Learning, highlights the models' difficulty in distinguishing between different roles of text, which undermines current security measures. This vulnerability raises concerns about the safety of deploying LLMs in critical applications, as traditional training methods may not fully address the issue.

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The story around this

Earlier coverage that leads up to this article, and what followed. Lines connect each piece to the closest one after it, converging here.

LLMs Optimize Database Query Execution Plans — Together AI Blog1Self-Evolving Claude Code Memory System Developed — Cole Medin2New Paper Explores AI Negation Neglect — AI Explained3Google AI Struggles with Basic Spelling — TechCrunch AI4AI Use in News Verification May Hinder Misinformation Detection — MIT News AI5Reasoning Enhances LLMs' Recall of Simple Facts — Google Research Blog6Hybrid Models Show Strength in Predicting Meaningful Tokens — Hugging Face Blog7vLLM v0.25.0rc2 Release Fixes Key Issues — vLLM Releases8LLMs Vulnerable to Chain-of-Thought Forgery AttacksStartups Innovate Beyond Transformers in LLMs — MIT Technology Review AI9Researchers Uncover AI Models' Hidden Reasoning — WIRED AI10Recall Bottleneck in LLMs: New Google Research Insights — Google Research Blog11Why LLMs Don't Actually Reason — MIT Technology Review AI12LLMs fail to reliably judge research novelty — Hugging Face Blog13Apr 3You are hereOct 27

How we got here

  1. 1
    LLMs Optimize Database Query Execution Plans

    Together AI Blog · April 3, 2026 · Background

  2. 2
    Self-Evolving Claude Code Memory System Developed

    Cole Medin · April 6, 2026 · Background

  3. 3
    New Paper Explores AI Negation Neglect

    AI Explained · May 20, 2026 · Background

  4. 4
    Google AI Struggles with Basic Spelling

    TechCrunch AI · May 28, 2026 · Background

  5. 5
    AI Use in News Verification May Hinder Misinformation Detection

    MIT News AI · June 9, 2026 · Background

  6. 6
    Reasoning Enhances LLMs' Recall of Simple Facts

    Google Research Blog · June 24, 2026 · Related

  7. 7
    Hybrid Models Show Strength in Predicting Meaningful Tokens

    Hugging Face Blog · June 25, 2026 · Background

  8. 8
    vLLM v0.25.0rc2 Release Fixes Key Issues

    vLLM Releases · July 9, 2026 · Background

What happened next

  1. 9
    Startups Innovate Beyond Transformers in LLMs

    MIT Technology Review AI · August 10, 2026 · Background

  2. 10
    Researchers Uncover AI Models' Hidden Reasoning

    WIRED AI · August 11, 2026 · Related

  3. 11
    Recall Bottleneck in LLMs: New Google Research Insights

    Google Research Blog · August 12, 2026 · Related

  4. 12
    Why LLMs Don't Actually Reason

    MIT Technology Review AI · October 2, 2026 · Related

  5. 13
    LLMs fail to reliably judge research novelty

    Hugging Face Blog · October 27, 2026 · Background

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