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Large language models (LLMs) have developed rapidly in recent years, revolutionizing various fields. Despite their widespread success, LLMs heavily rely on external code dependencies from package management systems, creating a complex and…

Cryptography and Security · Computer Science 2025-09-01 Shuhan Liu , Xing Hu , Xin Xia , David Lo , Xiaohu Yang

Large language models (LLMs) are increasingly used as alternatives to traditional search engines given their capacity to generate text that resembles human language. However, this shift is concerning, as LLMs often generate hallucinations,…

Computation and Language · Computer Science 2024-10-25 Cléa Chataigner , Afaf Taïk , Golnoosh Farnadi

In recent years, various software supply chain (SSC) attacks have posed significant risks to the global community. Severe consequences may arise if developers integrate insecure code snippets that are vulnerable to SSC attacks into their…

Cryptography and Security · Computer Science 2025-09-25 Xiaofan Li , Xing Gao

Hallucinations, outputs that sound plausible but are factually incorrect, remain an open challenge for deployed LLMs. In code generation, models frequently hallucinate non-existent software packages, recommending imports and installation…

Cryptography and Security · Computer Science 2026-05-05 Joseph Spracklen , Pedram Aghazadeh , Farinaz Koushanfar , Murtuza Jadliwala

Large language models (LLMs) trained on datasets of publicly available source code have established a new state of the art in code generation tasks. However, these models are mostly unaware of the code that exists within a specific project,…

Software Engineering · Computer Science 2024-06-21 Aryaz Eghbali , Michael Pradel

Large language models (LLMs) are known to generate plausible but false information across a wide range of contexts, yet the real-world magnitude and consequences of this hallucination problem remain poorly understood. Here we leverage a…

Digital Libraries · Computer Science 2026-05-11 Zhenyue Zhao , Yihe Wang , Toby Stuart , Mathijs De Vaan , Paul Ginsparg , Yian Yin

As Large Language Models (LLMs) continue to advance in their ability to write human-like text, a key challenge remains around their tendency to hallucinate generating content that appears factual but is ungrounded. This issue of…

Computation and Language · Computer Science 2024-01-09 S. M Towhidul Islam Tonmoy , S M Mehedi Zaman , Vinija Jain , Anku Rani , Vipula Rawte , Aman Chadha , Amitava Das

Large Language Models often generate factually incorrect but plausible outputs, known as hallucinations. We identify a more insidious phenomenon, LLM delusion, defined as high belief hallucinations, incorrect outputs with abnormally high…

Computation and Language · Computer Science 2025-03-11 Hongshen Xu , Zixv yang , Zichen Zhu , Kunyao Lan , Zihan Wang , Mengyue Wu , Ziwei Ji , Lu Chen , Pascale Fung , Kai Yu

As large language models continue to develop in the field of AI, text generation systems are susceptible to a worrisome phenomenon known as hallucination. In this study, we summarize recent compelling insights into hallucinations in LLMs.…

Computation and Language · Computer Science 2023-09-14 Hongbin Ye , Tong Liu , Aijia Zhang , Wei Hua , Weiqiang Jia

The prevalence of malicious packages in open-source repositories, such as PyPI, poses a critical threat to the software supply chain. While Large Language Models (LLMs) have emerged as a promising tool for automated security tasks, their…

Cryptography and Security · Computer Science 2026-03-03 Ahmed Ryan , Ibrahim Khalil , Abdullah Al Jahid , Md Erfan , Sungbin Park , Akond Ashfaque Ur Rahman , Md Rayhanur Rahman

Large Language Models for code generation frequently produce hallucinations in Fill-in-the-Middle (FIM) tasks -- plausible but incorrect completions such as invented API methods, invalid parameters, undefined variables, or non-existent…

Machine Learning · Computer Science 2026-05-12 Mahdi Erfanian , Nelson Daniel Troncoso , Aashna Garg , Amabel Gale , Xiaoyu Liu , Pareesa Ameneh Golnari , Shengyu Fu

Large Language Models (LLMs) have achieved state-of-the-art performance across software engineering tasks, from code generation to translation. However, we identify and systematically evaluate a critical failure mode: Programming Language…

Large language models (LLMs) often generate responses that deviate from user input or training data, a phenomenon known as "hallucination." These hallucinations undermine user trust and hinder the adoption of generative AI systems.…

Computation and Language · Computer Science 2025-04-25 Yejin Bang , Ziwei Ji , Alan Schelten , Anthony Hartshorn , Tara Fowler , Cheng Zhang , Nicola Cancedda , Pascale Fung

Large language models (LLMs) can generate executable code from natural language descriptions, but the resulting programs frequently contain bugs due to hallucinations. In the absence of formal specifications, existing approaches attempt to…

Software Engineering · Computer Science 2026-03-31 Yihan Dai , Sijie Liang , Haotian Xu , Peichu Xie , Sergey Mechtaev

The increasing development of LLMs in code generation has drawn significant attention among researchers. To enhance LLM-based code generation ability, current efforts are predominantly directed towards collecting high-quality datasets and…

Large Language Models (LLMs) are increasingly used to generate summaries of software bug reports, including sections such as Steps-to-Reproduce (S2R), Actual Behavior (AB), and Expected Behavior (EB). However, these models frequently…

Software Engineering · Computer Science 2026-05-26 Hinduja Nirujan , Shreyas Patil , Abdallah Ayoub , Ahmad Abdel Latif , Gouri Ginde

The majority of software developers use or are planning to use Artificial Intelligence (AI) tools in their development processes. Their top reasons include improving productivity and faster learning. In fact, Large Language Model…

Software Engineering · Computer Science 2026-05-25 Srivathsan G Morkonda , Mahmoud Selim , Hala Assal

Large Language Models (LLMs) for code have gained significant attention recently. They can generate code in different programming languages based on provided prompts, fulfilling a long-lasting dream in Software Engineering (SE), i.e.,…

Software Engineering · Computer Science 2024-03-19 Florian Tambon , Arghavan Moradi Dakhel , Amin Nikanjam , Foutse Khomh , Michel C. Desmarais , Giuliano Antoniol

In the age of misinformation, hallucination - the tendency of Large Language Models (LLMs) to generate non-factual or unfaithful responses - represents the main risk for their global utility. Despite LLMs becoming increasingly multilingual,…

Computation and Language · Computer Science 2026-02-03 Saad Obaid ul Islam , Anne Lauscher , Goran Glavaš

Large language models (LLMs) have revolutionized natural language processing, yet their propensity for hallucination, generating plausible but factually incorrect or fabricated content, remains a critical challenge. This report provides a…

Computation and Language · Computer Science 2025-08-05 Manuel Cossio