REVIEW 6 major objections 5 minor 27 references
LLM Embedding-based Attribution (LEA): Quantifying Source Contributions to Generative Model's Response for Vulnerability Analysis
T0 review · 6 major / 5 minor · reviewed 2026-08-07 · deepseek-v4-flash
Pith's one-line read LEA, computed from layer-0 embedding ranks, quantifies how much of an LLM response comes from retrieved context versus internal knowledge, and separates valid, generic, and absent retrieval with over 95% accuracy on larger models.
desk verdict A cheap, high-performing retrieval-quality detector; the attribution claim is a leap the paper never validates. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The load-bearing object is layer-0 linear dependence. For each token of the generated response, the paper appends the token's layer-0 hidden state (embedding plus positional encoding) to the matrix formed by the question-token embeddings and asks whether the numerical rank of the matrix increases, giving a binary signal per token. This is computed twice, for the sequence without retrieved context and for the sequence with retrieved context, and the two bits are aggregated over response tokens into the three-component LEA distribution $A_{\mathrm{fnd}}$, $A_{\mathrm{rag}}$, and $A_q$. The mechanism rests on the observation that transformer hidden states exhibit high redundancy, so only a subset of tokens adds genuinely new linear directions; layer 0 is chosen because later layers increasingly treat tokens as independent and lose the inter-token dependency signal.
What would settle it
Build a response whose tokens are known by construction to come from one source—some tokens copied verbatim from the retrieved paragraph, some copied from the question, some produced without retrieval—and compute LEA's per-token $\delta$ values; if copied-retrieval tokens are not flagged as $A_{\mathrm{rag}}$, or question-copied tokens are, the signal is not measuring source. A second decisive check is to vary the rank threshold or numerical tolerance and show that the 95% separation between valid and generic retrieval survives the variation.
Extended reading notes
Core claim
The central claim is that the relative influence of the input query, the retrieved context, and the model's internal parameters on a generated response can be read off from the linear dependence structure of layer-0 token embeddings. For each generated token $i$, the paper defines two binary indicators $\delta_i^{M}$ and $\delta_i^{M'}$, equal to 1 exactly when appending that token's embedding to the question-token matrix increases the numerical rank of the matrix, computed with and without the retrieved context in the sequence. The three-component LEA distribution $(A_{\mathrm{fnd}}; A_{\mathrm{rag}}; A_q)$ aggregates those indicators over the response: the fraction of tokens that stay linearly independent, the fraction that become dependent only after the retrieved context is added, and the fraction that remain dependent. The paper's empirical claim is that a well-grounded response shows a balanced distribution with substantial $A_{\mathrm{rag}}$, a generic or retrieval-free response is dominated by $A_{\mathrm{fnd}}$, and an incorrectly retrieved response mirrors the valid case, exposing the model's inability to distinguish wrong context from right context.
Load-bearing premise
The whole method stands on the assumption that whether a token's embedding adds a new independent direction to the question's layer-0 matrix is a faithful indicator of where the token's meaning came from; the paper never validates this against token-level ground truth and never specifies the numerical tolerance used to decide whether the rank actually increases.
Editorial extensions
If this is right
- A learned threshold on $A_{\mathrm{rag}}$ can serve as a triage rule: responses that fall below it are flagged as generic or ungrounded and can be sent for human review before patch priorities are set.
- Valid retrieval becomes the expected, verifiable baseline: when the NVD description is supplied, LEA shows a balanced dependence on retrieved context and internal knowledge, giving analysts a reference distribution for a trustworthy answer.
- Because the incorrect-retrieval distribution closely matches the valid-retrieval distribution, retrieval quality must be verified before the LLM call, not inferred from the answer's fluency.
- The metric separates valid from generic or absent retrieval more sharply on larger models, suggesting that the attribution signal is clearer when the underlying model has more capacity.
Reading between the lines
- Editorial inference: LEA's layer-0 rank test should transfer to non-cybersecurity RAG tasks such as open-domain QA, where template-based prompts can produce generated tokens whose true source is known; a positive result would turn LEA into a general RAG-fidelity audit tool.
- Editorial inference: The near-identical distributions for valid and incorrect retrieval imply that LEA detects reliance, not correctness; catching wrong-but-confidently-used context needs an additional consistency check between the retrieved text and the generation.
- Editorial inference: The paper reports accuracy at one threshold per model chosen from the ROC curve; reporting calibration curves and per-year breakdowns, especially for post-cutoff 2025 CVEs, would show how stable the 95% figure is in operational settings.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper proposes LLM Embedding-based Attribution (LEA), a metric intended to quantify how much of an LLM's generated response is attributable to the input query, retrieved context (RAG), or the model's internal knowledge. LEA is computed by measuring, at layer 0, whether appending each generated token's vector to a question matrix increases the numerical rank of that matrix, and then aggregating the resulting binary transition patterns into three distribution components. The authors evaluate LEA on 500 CVEs from 2016–2025 across three RAG scenarios (valid, generic, incorrect) and three LLMs, reporting distributional differences and classification accuracies above 95% for distinguishing valid retrieval from generic or no retrieval. They also report that incorrect retrieval produces LEA distributions similar to valid retrieval, which they present as a caution about blind reliance on RAG. The paper includes a dataset and code release.
Significance. If the proposed metric were well-defined and validated, LEA could be a practically useful tool for auditing RAG-based vulnerability analysis pipelines, and the curated dataset of 500 CVEs with three retrieval scenarios is a valuable resource for the security community. The empirical observation that LEA captures clear distributional differences between informative and non-informative retrieval is a credible and reproducible starting point. However, the central claim of the paper—that LEA quantifies the relative causal contribution of internal knowledge versus retrieved content—is not supported by the evidence presented. The aggregate distributional separation does not establish token-level attribution, and the metric itself is not specified precisely enough to be reproduced as written. The paper's main value at present is as an empirical demonstration that certain rank-based statistics differ across retrieval quality, not as a validated attribution method.
major comments (6)
- [Eq. (10)–(11), Sec. 4] The definition of the LEA components is not reproducible as written. Equation (10) defines A(M,M′) as a sum over tokens of (1/h) δ^M_i ∧ δ^M′_i, but h is never defined, and Equation (11) then sets LEA = (A(1,1); A(1,0); A(0,0)), which is not a valid substitution because A takes matrices M,M′, not booleans. In addition, δ^M_i is defined as whether appending a token vector to the “question matrix Q” increases rank, but Q is never defined, nor is the vector representation to be appended. The paper must specify Q, the vector, h, and the exact rank test before the metric can be evaluated.
- [Table 2, Secs. 3–4] The rank computation is under-specified: Table 2 reports “rank xθy 48%” and similar values, but matrix rank is an integer, so the normalization is unclear. With floating-point embeddings, the exact rank of a token matrix is generically full, so “increases rank” is meaningful only relative to a numerical tolerance (e.g., an SVD singular-value cutoff). No tolerance is given, which makes the central δ_i values undefined.
- [Sec. 4, “should not occur”] The paper defines three LEA components (Afnd, Arag, Aq) and states that the (0,1) transition—dependent without RAG, independent with RAG—“should not occur as it indicates inconsistency.” If such transitions occur, the three components do not sum to 1, and the reported distributions are not a proper partition of tokens. The paper does not report the frequency of (0,1) transitions or explain how they are handled; this needs to be resolved for the metric to be meaningful.
- [Sec. 6.2, Table 4] The post-hoc filtering of tokens (stop-word removal plus discarding tokens with ∆p ≤ 0) is not justified beyond an appeal to semantic value. Since the threshold filter uses final-layer probabilities that are correlated with the very signal LEA measures, it may systematically alter the LEA distribution (e.g., by removing tokens that are invariant to RAG, inflating Arag). The paper should report unfiltered results or justify the filter with a sensitivity analysis.
- [Secs. 3, 6.2–6.3] The load-bearing premise that a token's rank-increase status at layer 0 tracks the token's causal source is never validated. The experimental evidence shows only that aggregate Arag distributions differ across valid, generic, and non-retrieval conditions, and that Arag drops when the response mismatches the retrieval. These are response-level associations, not token-level attributions; the cited LoRA/pruning results concern low-rank weight updates and redundant directions, not the causal origin of generated tokens. The authors should validate δ_i against token-level ground truth, for example via intervention experiments that remove or corrupt the retrieved context and check which tokens change.
- [Sec. 6.4, Figs. 8–9] The paper demonstrates that LEA cannot distinguish valid from incorrect retrieval, since the distributions closely overlap. Because incorrect retrieval is the most dangerous failure in the motivating vulnerability-analysis scenario, the abstract's claim that LEA “offers security analysts with a metric to audit RAG-enhanced workflows” is broader than what the metric delivers. The claims should be re-scoped to detecting non-informative versus informative retrieval, or the method should be extended to flag incorrect retrieval.
minor comments (5)
- [Eq. (8)] The row space of X ∈ F^{m×n} should be a subspace of F^n, not F^m as written.
- [Sec. 5.2] The citation list appears to have a mismatch: Mistral-Small-24B is cited as [18], but [12] is DeepSeek-R1-Distill-Llama-8B; check the references.
- [Sec. 6.5] The sentence “This distinction is 100% for the CVEs in 2025” is hard to reconcile with the 92–97% test accuracies in Table 5; clarify whether this refers to separation of distributions rather than classification accuracy.
- [Fig. 9] The captions and text could state more plainly that the overlapping distributions are the key finding, since the figure currently reads as a failed comparison.
- [Eq. (10)] If the factor 1/h is a typo or stands for a normalization constant, it should be defined; as written it is unexplained.
Circularity Check
No significant circularity: LEA is a proposed definitional metric, and its empirical evaluation is grounded in externally labeled retrieval scenarios with a held-out test split.
full rationale
The paper defines LEA as a metric rather than deriving a prediction from fitted inputs: Arag is defined in Eq. 11 as the fraction of response tokens that are rank-independent without retrieval and rank-dependent with retrieval. The central claim that this fraction quantifies retrieved-content contribution is an interpretive assumption, not a derived result, and no equation in the paper reduces a predicted quantity to a fitted parameter. The empirical evaluation is externally grounded: the 'valid/generic/incorrect' labels are assigned by dataset construction (NVD description, RedHat generic text, suffix-matched wrong CVE), and Table 5 reports held-out test accuracy from an 80/20 split with a threshold chosen from the ROC curve. There are no self-citations to the authors' prior work, and the cited LoRA/pruning results are external, so no load-bearing self-citation chain exists. The lack of validation that a layer-0 rank increase tracks token-level causal source, and the undefined quantities Q, h, and the numerical rank tolerance, are correctness and reproducibility concerns, not circularity under the specified patterns. Therefore no significant circularity is found.
Assumptions & free parameters
free parameters (3)
- Arag classification threshold =
12.5% (Gemma-3-27B), 13.3% (Mistral-Small-24B), 12.3% (LLaMA-3.2-3B)
- effective rank tolerance =
not specified
- probability-delta filter cutoff =
0
assumptions (3)
- domain assumption Linear dependence of token embeddings is a valid proxy for the source of token generation.
- domain assumption Adding retrieved context changes the span of the question matrix in a way that isolates RAG influence.
- ad hoc to paper The (0,1) transition (dependent without RAG, independent with RAG) should not occur and is ignored.
Cite this review
Pith. "Pith review of LLM Embedding-based Attribution (LEA): Quantifying Source Contributions to Generative Model's Response for Vulnerability Analysis." pith.science (2026). https://pith.science/paper/LZKB3U66
@misc{pith2026250612100,
author = {Pith},
title = {Pith review of: LLM Embedding-based Attribution (LEA): Quantifying Source Contributions to Generative Model's Response for Vulnerability Analysis},
year = {2026},
howpublished = {\url{https://pith.science/paper/LZKB3U66}},
note = {Machine review of arXiv:2506.12100}
}
read the original abstract
Large Language Models (LLMs) are increasingly used for cybersecurity threat analysis, but their deployment in security-sensitive environments raises trust and safety concerns. With over 21,000 vulnerabilities disclosed in 2025, manual analysis is infeasible, making scalable and verifiable AI support critical. When querying LLMs, dealing with emerging vulnerabilities is challenging as they have a training cut-off date. While Retrieval-Augmented Generation (RAG) can inject up-to-date context to alleviate the cut-off date limitation, it remains unclear how much LLMs rely on retrieved evidence versus the model's internal knowledge, and whether the retrieved information is meaningful or even correct. This uncertainty could mislead security analysts, mis-prioritize patches, and increase security risks. Therefore, this work proposes LLM Embedding-based Attribution (LEA) to analyze the generated responses for vulnerability exploitation analysis. More specifically, LEA quantifies the relative contribution of internal knowledge vs. retrieved content in the generated responses. We evaluate LEA on 500 critical vulnerabilities disclosed between 2016 and 2025, across three RAG settings -- valid, generic, and incorrect -- using three state-of-the-art LLMs. Our results demonstrate LEA's ability to detect clear distinctions between non-retrieval, generic-retrieval, and valid-retrieval scenarios with over 95% accuracy on larger models. Finally, we demonstrate the limitations posed by incorrect retrieval of vulnerability information and raise a cautionary note to the cybersecurity community regarding the blind reliance on LLMs and RAG for vulnerability analysis. LEA offers security analysts with a metric to audit RAG-enhanced workflows, improving the transparent and trustworthy deployment of AI in cybersecurity threat analysis.
Figures
Figures from the paper (7 more)
Reference graph
Works this paper leans on
-
[1]
Self-RAG: Learning to Retrieve, Generate, and Critique through Self-Reflection
Akari Asai, Zeqiu Wu, Yizhong Wang, Avirup Sil, and Hannaneh Hajishirzi. Self-RAG: Learning to Retrieve, Generate, and Critique through Self-Reflection. The Twelfth International Conference on Learning Represen- tations, 2023
work page 2023
-
[2]
Improving Language Models by Retrieving from Trillions of Tokens
Sebastian Borgeaud, Arthur Mensch, Jordan Hoffmann, Trevor Cai, Eliza Rutherford, Katie Millican, George Bm Van Den Driessche, Jean-Baptiste Lespiau, Bogdan Damoc, Aidan Clark, et al. Improving Language Models by Retrieving from Trillions of Tokens. International Conference on Machine Learning , pages 2206–2240, 2022
work page 2022
-
[3]
Evaluation of ChatGPT Model for Vulnerabil- ity Detection
Anton Cheshkov, Pavel Zadorozhny, and Rodion Levichev. Evaluation of ChatGPT Model for Vulnerabil- ity Detection. arXiv preprint arXiv:2304.07232, 2023
arXiv 2023
-
[4]
ChatNVD: Advancing Cybersecurity Vulnerability Assessment with Large Language Models
Shivansh Chopra, Hussain Ahmad, Diksha Goel, and Claudia Szabo. ChatNVD: Advancing Cybersecurity Vulnerability Assessment With Large Language Models. arXiv preprint arXiv:2412.04756, 2024
work page Pith review arXiv 2024
-
[5]
PentestGPT: Evaluating and Harnessing Large Language Models for Automated Pen- etration Testing
Gelei Deng, Yi Liu, Víctor Mayoral-Vilches, Peng Liu, Yuekang Li, Yuan Xu, Tianwei Zhang, Yang Liu, Martin Pinzger, and Stefan Rass. PentestGPT: Evaluating and Harnessing Large Language Models for Automated Pen- etration Testing. In 33rd USENIX Security Symposium (USENIX Security 24). USENIX Association, 2024
work page 2024
-
[6]
A Sliding Layer Merging Method for Effi- cient Depth-Wise Pruning in LLMs
Xuan Ding, Yao Zhu, Yunjian Zhang, and Chuanlong Xie. A Sliding Layer Merging Method for Effi- cient Depth-Wise Pruning in LLMs. arXiv preprint arXiv:2502.19159, 2025
arXiv 2025
-
[7]
Vul-RAG: Enhancing LLM- based Vulnerability Detection via Knowledge-level RAG
Xueying Du, Geng Zheng, Kaixin Wang, Jiayi Feng, Wentai Deng, Mingwei Liu, Bihuan Chen, Xin Peng, Tao Ma, and Yiling Lou. Vul-RAG: Enhancing LLM- based Vulnerability Detection via Knowledge-level RAG. arXiv preprint arXiv:2406.11147, 2024
arXiv 2024
-
[8]
Introducing Gemma 3: The Most Ca- pable Model You Can Run on a Single GPU or TPU
Google. Introducing Gemma 3: The Most Ca- pable Model You Can Run on a Single GPU or TPU. https://blog.google/technology/ developers/gemma-3/, 2025. Accessed: 2025- 04
work page 2025
Show all 27 references
-
[9]
From ChatGPT to ThreatGPT: Impact of Generative AI in Cybersecurity and Privacy
Maanak Gupta, CharanKumar Akiri, Kshitiz Aryal, Eli Parker, and Lopamudra Praharaj. From ChatGPT to ThreatGPT: Impact of Generative AI in Cybersecurity and Privacy. IEEE Access, 2023
2023
-
[10]
LoRA: Low-Rank Adaptation of Large Language Models
Edward J Hu, Phillip Wallis, Zeyuan Allen-Zhu, Yuanzhi Li, Shean Wang, Lu Wang, Weizhu Chen, et al. LoRA: Low-Rank Adaptation of Large Language Models. 2021
2021
-
[11]
A Survey on Hallucination in Large Language Models: Princi- ples, Taxonomy, Challenges, and Open Questions.arXiv preprint arXiv:2311.05232, 2023
Lei Huang, Weijiang Yu, Weitao Ma, Weihong Zhong, Zhangyin Feng, Haotian Wang, Qianglong Chen, Wei- hua Peng, Xiaocheng Feng, Bing Qin, et al. A Survey on Hallucination in Large Language Models: Princi- ples, Taxonomy, Challenges, and Open Questions.arXiv preprint arXiv:2311.0...
2023 arXiv
-
[12]
DeepSeek-R1-Distill-Llama-8B
HuggingFace. DeepSeek-R1-Distill-Llama-8B. https://huggingface.co/deepseek-ai/ DeepSeek-R1-Distill-Llama-8B , 2025. Accessed: 2025-03
2025
-
[13]
Adaptive-RAG: Learn- ing to Adapt Retrieval-Augmented Large Language Models through Question Complexity
Soyeong Jeong, Jinheon Baek, Sukmin Cho, Sung Ju Hwang, and Jong C Park. Adaptive-RAG: Learn- ing to Adapt Retrieval-Augmented Large Language Models through Question Complexity. arXiv preprint arXiv:2403.14403, 2024
2024 arXiv
-
[14]
Understand- ing the Effectiveness of Large Language Models in Detecting Security Vulnerabilities
Avishree Khare, Saikat Dutta, Ziyang Li, Alaia Solko- Breslin, Rajeev Alur, and Mayur Naik. Understand- ing the Effectiveness of Large Language Models in Detecting Security Vulnerabilities. arXiv preprint arXiv:2311.16169, 2023
2023 arXiv
-
[15]
SuRe: Summarizing Retrievals using An- swer Candidates for Open-domain QA of LLMs
Jaehyung Kim, Jaehyun Nam, Sangwoo Mo, Jongjin Park, Sang-Woo Lee, Minjoon Seo, Jung-Woo Ha, and Jinwoo Shin. SuRe: Summarizing Retrievals using An- swer Candidates for Open-domain QA of LLMs. arXiv preprint arXiv:2404.13081, 2024
2024 arXiv
-
[16]
LLM- Pruner: On the Structural Pruning of Large Language Models
Xinyin Ma, Gongfan Fang, and Xinchao Wang. LLM- Pruner: On the Structural Pruning of Large Language Models. Advances in neural information processing systems, 36:21702–21720, 2023
2023
-
[17]
Llama 3.2: Revolutionizing edge ai and vi- sion with open, customizable models
AI Meta. Llama 3.2: Revolutionizing edge ai and vi- sion with open, customizable models. Meta AI Blog. Retrieved December, 20, 2024. Accessed: 2025-01
2024
-
[18]
Mistral Small 3
Mistral AI. Mistral Small 3. https://mistral. ai/news/mistral-small-3, 2025. Accessed: 2025-03. 14
2025
-
[19]
LOCALINTEL: Generating Organizational Threat Intelligence from Global and Local Cyber Knowl- edge
Shaswata Mitra, Subash Neupane, Trisha Chakraborty, Sudip Mittal, Aritran Piplai, Manas Gaur, and Shahram Rahimi. LOCALINTEL: Generating Organizational Threat Intelligence from Global and Local Cyber Knowl- edge. arXiv preprint arXiv:2401.10036, 2024
2024 arXiv
-
[20]
CVE - Common Vulnerabilities and Expo- sures
MITRE. CVE - Common Vulnerabilities and Expo- sures. https://cve.mitre.org/, 2024. Ac- cessed: 2024-11
2024
-
[21]
National Vulnerability Database (NVD)
NIST. National Vulnerability Database (NVD). https://nvd.nist.gov/, 2024. Accessed: 2024- 11
2024
-
[22]
Empirical Validation of Automated Vulnerability Curation and Characterization
Ahmet Okutan, Peter Mell, Mehdi Mirakhorli, Igor Khokhlov, Joanna CS Santos, Danielle Gonzalez, and Steven Simmons. Empirical Validation of Automated Vulnerability Curation and Characterization. IEEE Transactions on Software Engineering , 49(5):3241– 3260, 2023
2023
-
[23]
AGIR: Automating Cyber Threat Intelligence Reporting with Natural Language Gener- ation
Filippo Perrina, Francesco Marchiori, Mauro Conti, and Nino Vincenzo Verde. AGIR: Automating Cyber Threat Intelligence Reporting with Natural Language Gener- ation. In 2023 IEEE International Conference on Big Data (BigData), pages 3053–3062. IEEE, 2023
2023
-
[24]
The Troubling Emergence of Hallucination in Large Language Models–An Extensive Definition, Quantification, and Prescriptive Remedia- tions
Vipula Rawte, Swagata Chakraborty, Agnibh Pathak, Anubhav Sarkar, SM Tonmoy, Aman Chadha, Amit P Sheth, and Amitava Das. The Troubling Emergence of Hallucination in Large Language Models–An Extensive Definition, Quantification, and Prescriptive Remedia- tions. arXiv preprint a...
-
[25]
What is a CVE? https://www.redhat
RedHat. What is a CVE? https://www.redhat. com/en/topics/security/what-is-cve,
-
[26]
Attention Is All You Need
Ashish Vaswani, Noam Shazeer, Niki Parmar, Jakob Uszkoreit, Llion Jones, Aidan N Gomez, Łukasz Kaiser, and Illia Polosukhin. Attention Is All You Need. Ad- vances in Neural Information Processing Systems, 30, 2017
2017
-
[27]
Hallucination Mitigation for Retrieval-Augmented Large Language Models: A Review
Wan Zhang and Jing Zhang. Hallucination Mitigation for Retrieval-Augmented Large Language Models: A Review. Mathematics, 13(5):856, 2025. 15
2025
Reviewed August 7, 2026 · model on record in the stance chip above.
Discussion (0). Sign in to comment.