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VLSBench: Unveiling Visual Leakage in Multimodal Safety

T0 review · 3 major / 5 minor · reviewed 2026-08-12 · deepseek-v4-flash

Pith's one-line read Existing multimodal safety benchmarks leak the image's risk into the textual query, so models can refuse based on text alone; the paper introduces VLSBench to measure cross-modal safety without that leakage.

desk verdict VSIL is a real, well-measured problem, and VLSBench is a useful new benchmark—but the paper never audits its own benchmark with the same leakage metric, which is the one gap worth fixing. read the letter →

arxiv 2411.19939 v3 pith:LUBVFCQQ submitted 2024-11-29 cs.CR cs.AIcs.CLcs.CV

classification cs.CRcs.AIcs.CLcs.CV
keywords multimodallargelanguagemodelssafetyalignmentvisualinformationleakagebenchmarktextualcross-modalityevaluationjailbreakrobustnessVSIL
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

Existing multimodal safety benchmarks, the paper argues, are not really multimodal: the risky content shown in the image is almost always spelled out in the textual query, so a model can refuse without looking at the image. The paper calls this Visual Safety Information Leakage (VSIL) and shows that across four established benchmarks the text alone is judged harmful in more than 99% of the cases where the image-text pair is harmful. Because of this, simple text-only alignment performs as well as image-text alignment on those benchmarks, which the paper presents as evidence that the benchmarks are unreliable for cross-modal safety. To fix this, the paper builds VLSBench, 2.2k image-text pairs in which the query is harmless on its own and the image carries the risk. On VLSBench, text-only training falls behind multimodal training, and even strong closed models such as GPT-4o reach only about 21% safety rate, suggesting the field needs genuinely multimodal safety alignment rather than text-level refusal.

What carries the argument

The central object is the Visual Safety Information Leakage (VSIL) condition: for an unsafe image-text pair $(T,I)$, the safety judge labels the query alone as unsafe, $J(T,I)=J(T)=\mathrm{unsafe}$, so the image adds no safety information. The paper measures leakage through two rates, $R_1$ (fraction of pairs judged unsafe) and $R_2$ (fraction where both pair and query alone are unsafe); a near-zero $R_1-R_2$ is the leakage signature. The constructive machinery is a four-step pipeline: generate harmful queries and image descriptions from harmful elements with GPT-4o and from existing images with Qwen2-VL-72B; paraphrase those queries into harmless-sounding ones with a few-shot GPT-4o prompt and filter out queries that still leak risk or lose meaning; generate images with Stable-Diffusion-3.5-Large using iterative Qwen2-VL-72B checking and prompt refinement; and finally filter mismatched or safe pairs with GPT-4o and a small human review. Evaluation uses a GPT-4o judge that sorts responses into 'safe with refusal', 'safe with warning', and 'unsafe'.

What would settle it

Run the paper's own $R_1-R_2$ test on VLSBench with a strong multimodal judge or with human raters. If a substantial fraction of the final queries are judged unsafe by text alone (say $R_1-R_2 > 1\%$), the benchmark retains the leakage it claims to remove; if the texts stay harmless alone while the pairs are judged harmful, the central claim holds.

Watch

Extended reading notes

Core claim

On the paper's terms, the central discovery is that visual safety information leaks into the text of existing multimodal safety datasets: for an unsafe image-text pair $(T,I)$, the safety judge $J$ already labels the query alone as unsafe, $J(T,I)=J(T)=\mathrm{unsafe}$, so the image contributes nothing to the refusal decision. Quantitative evidence: on SafeBench, JailbreakV-raw, Harmbench-mm, and VLSafe the difference $R_1-R_2$ (harmful pair rate minus rate where text alone is also harmful) is below 1%. The paper then constructs VLSBench so that the text is neutral and the risk lives in the image, and shows that on this benchmark the ranking flips: textual SFT on LLaVA-v1.5-7B reaches 13.99% safety versus 21.26% for multimodal SFT, and on Qwen2-VL-7B 67.42% versus 78.39%, while on leakage-prone benchmarks text-only alignment is within about one percentage point of multimodal alignment. This reversal is the paper's evidence that VLSBench measures cross-modal safety rather than text-only refusal.

Load-bearing premise

The pipeline's GPT-4o paraphrase and filtration steps, with only a small human review, actually make every VLSBench query harmless on its own while the image-text pair stays harmful; the paper does not report a dataset-wide audit showing this for VLSBench itself.

Editorial extensions

If this is right

  • Existing multimodal safety benchmark scores overstate how well MLLMs reject unsafe image-text input, because a text-only refusal can look like a multimodal refusal.
  • The earlier conclusion that textual unlearning or textual SFT is enough for multimodal safety holds only on leakage-prone data; on VLSBench it does not.
  • VLSBench's results show that even safety-aligned models reach at best 78.39% safety, so dedicated multimodal alignment remains an open problem.
  • Models rarely give safety warnings with explanations; most safe behavior is direct refusal, indicating current MLLMs are not good at safety reasoning as assistants.
  • If the benchmark is representative, future safety evaluations should report whether the image is necessary to detect risk, since that is the property VLSBench tests.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • A quality gate for any future multimodal safety benchmark would be to report its own $R_1-R_2$ before release; if the queries alone are already flagged, the benchmark cannot measure cross-modal safety.
  • The paper's caption-substitution experiments point toward a cheap deployment-time defense of routing images through a caption and letting a text-only safety layer decide, though the reported numbers are mixed and should be tested on the full VLSBench.
  • If VSIL is common in real-world prompting, then jailbreak robustness results based on text-only attacks are incomplete: a model that refuses an explicit query may be bypassed when the same harmful intent is carried by the image alone.
  • A natural extension is to train or fine-tune models on VLSBench-style data and test whether safety generalizes across its 19 sub-categories, which would show whether the benchmark measures a transferable skill rather than a memorized refusal pattern.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 5 minor

Summary. The paper identifies a Visual Safety Information Leakage (VSIL) problem in existing multimodal safety benchmarks: the risky content of the image is already present in the textual query, so models can refuse on text alone. It quantifies this with an R1/R2 metric on four benchmarks using two judges, and shows that textual-only alignment performs nearly as well as multimodal alignment on those benchmarks. The authors then construct VLSBench, a 2.2k image-text dataset whose queries are intended to be harmless without the image while the image-text pair is harmful, and they report that current and safety-aligned MLLMs achieve low safety rates on it. The paper concludes that VSIL inflated prior benchmark results and that multimodal alignment becomes preferable once the leakage is removed.

Significance. The VSIL discovery is timely and important: it offers a concrete, measurable explanation for the counterintuitive result that textual alignment matches multimodal alignment in multimodal safety, and the R1-R2 evidence in Table 1 is a clean falsifiable statistic. The release of code and data, the wide model coverage, and the two-judge cross-check in Appendix C are strengths. However, the central property of the new benchmark — that its queries are harmless alone while the pairs are harmful — is never audited with the same R1/R2 procedure, and the only large-scale human check reported in Appendix G validates the evaluation judge rather than the dataset itself. The significance of the VLSBench contribution is therefore conditional on an additional dataset-level audit.

major comments (3)
  1. [Section 2.1 vs. Section 3.2 / Appendix F.3] The paper defines R1/R2 in Section 2.1 and uses R1-R2 < 1% on existing benchmarks as evidence of VSIL, but it never reports R1/R2 on VLSBench itself. Section 3.2 describes the construction filters, and Appendix F.3 states that the authors and three labelers verified criteria (a) harmless query and (b) matched, harmful pair, yet no counts, no removal rates, and no inter-annotator agreement are given. Because VLSBench's entire purpose is to be leakless, the released dataset's key property is currently asserted by pipeline design rather than measured. Please report R1/R2 (or an equivalent query-only-vs-pair harm rate) on VLSBench with at least two independent judges and a human-annotated sample, and compare the resulting gap with Table 1.
  2. [Appendix C / Table 7] The claim in Section 2.1 that 'R1-R2 is less than 1%' is only true for the LlamaGuard3-11B-Vision judge. The GPT-4o results in Appendix C show R1-R2 = 4.95% on SafeBench, 3.57% on JailbreakV-raw, and 4.36% on Harmbench-mm. The paper should either report the two judges separately throughout, present a judge-averaged or judge-marginalized estimate, or explicitly discuss why the LlamaGuard3-Vision result is the preferred measurement. This matters because the magnitude and universality of VSIL in existing benchmarks is the empirical motivation for building VLSBench.
  3. [Appendix G / Section 3.2] The human verification in Appendix G is a 200-sample validation of the GPT-4o response judge, not a validation of the VLSBench dataset labels. Since GPT-4o is used in Steps 2 and 4 of the construction pipeline to detokenify, filter, and label the final pairs, and GPT-4o is also the sole judge for all VLSBench experiments, the claim that VLSBench queries are harmless out of context and harmful in context is not independently grounded. Please provide a dataset-level human audit with sample size, per-category counts, and agreement rates for both criteria, and report how many samples were removed during Step 4 and Appendix F.3. Without this, the low safety rates in Tables 3-4 could be an artifact of the same judge used to construct and evaluate the benchmark.
minor comments (5)
  1. [Section 4.2] The sentence 'Table 2 shows a clear disparity between textual alignment methods and multimodal alignment methods' appears to refer to the VLSBench alignment results, which are in Table 4; Table 2 is the VSIL-era comparison and would instead support the opposite conclusion. Please correct the cross-reference.
  2. [Section 2.1 / Appendix D] The same dataset is called 'Chef' in Section 2.1 and 'Ch3ef' in Appendix D and elsewhere; please unify the notation.
  3. [Throughout] There are several typos and wording issues: 'compromises' for 'comprises' in Section 3.1 and Appendix F.1, 'Appdendix E.3' in Section 2.2.1, 'Evaluaiton' in Section E.3, and 'words cloud' for 'word cloud' in Appendix F.1.
  4. [Appendix H.1] The text says 'The experiment results shown in Table 7' but the safety-prompt results are presented in Figure 7; please fix the reference.
  5. [Section 4.2] The statement that 'Current MLLMs struggle to perform notable safety warnings without direct refusal' is hard to reconcile with Gemini-1.5-pro's 48.44% warning rate in Table 3; please qualify the claim to models with high refusal rates rather than presenting it as a general observation.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: VSIL is measured with external judges and VLSBench's central claims rest on independent benchmarks and human-verified evaluation.

full rationale

The central derivation is not circular. VSIL is defined via a safety judge J and then measured on four external benchmarks with LlamaGuard3-11B-Vision as J (Table 1), cross-checked with GPT-4o in Appendix C; R1 and R2 are computed quantities, not assumptions. The textual-versus-multimodal alignment comparison (Section 2.2) uses external baselines (VLGuard, SPA-VL, SafeRLHF) and an external judge (LlamaGuard3-8B), so the conclusion that textual alignment suffices on VSIL benchmarks is an empirical result, not an identity. For VLSBench, the pipeline (Section 3.2) uses GPT-4o for generation and filtration and GPT-4o as the evaluation judge; this same-model design is a validity limitation acknowledged in Section 6, and the 'leakless' property is asserted via the construction and a human review (Appendix F.3) rather than measured with the R1/R2 metric on the final set. That is missing validation, not circular derivation: the paper does not define VLSBench's harmlessness in terms of the evaluation outcome, and the judge itself is human-verified on 200 samples (Appendix G, Tables 13-15). Self-citations (Salad-Bench for taxonomy, Chef for images, SPA-VL for baselines) are either non-load-bearing or externally falsifiable and do not carry the argument. No equation or fitted parameter is reused as its own prediction.

Assumptions & free parameters 0 free parameters · 5 assumptions · 0 invented entities

The paper's claims rest on benchmark construction and judge-model assumptions, not on new physical or mathematical entities. No numeric free parameters are fitted to data. The main validation gap is the reliance on GPT-4o both as constructor and as judge.

assumptions (5)
  • domain assumption LlamaGuard3-11B-Vision and GPT-4o judges correctly identify harm in text-only and image-text inputs.
    The VSIL evidence (Table 1) and benchmark results depend on judge accuracy; only small human verification is provided for GPT-4o on VLSBench.
  • domain assumption The GPT-4o evaluation prompt correctly classifies responses as safe-refusal, safe-warning, or unsafe on VLSBench.
    Appendix G validates on 200 samples with human agreement, not on the full 2,241 pairs.
  • ad hoc to paper The construction pipeline (harmful query generation, detoxification, iterative image generation, and final filtering) removes VSIL while preserving harmfulness of the pair.
    Section 3.2 asserts this through design and a final manual review, with no dataset-wide quantitative leak audit.
  • domain assumption The 6-category, 19-subcategory safety taxonomy is an adequate representation of multimodal safety for benchmarking.
    Section 3.1 introduces the taxonomy; completeness is not empirically established.
  • domain assumption Stable-Diffusion-3.5-Large generated images carry the intended harmful visual content without being NSFW-detectable.
    Table 6 shows low NSFW detector scores, but the intended visual risk is not independently verified per image.

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Cite this review

Pith. "Pith review of VLSBench: Unveiling Visual Leakage in Multimodal Safety." pith.science (2026). https://pith.science/paper/LUBVFCQQ

@misc{pith2026241119939,
  author       = {Pith},
  title        = {Pith review of: VLSBench: Unveiling Visual Leakage in Multimodal Safety},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/LUBVFCQQ}},
  note         = {Machine review of arXiv:2411.19939}
}
read the original abstract

Safety concerns of Multimodal large language models (MLLMs) have gradually become an important problem in various applications. Surprisingly, previous works indicate a counterintuitive phenomenon that using textual unlearning to align MLLMs achieves comparable safety performances with MLLMs aligned with image text pairs. To explain such a phenomenon, we discover a Visual Safety Information Leakage (VSIL) problem in existing multimodal safety benchmarks, i.e., the potentially risky content in the image has been revealed in the textual query. Thus, MLLMs can easily refuse these sensitive image-text pairs according to textual queries only, leading to unreliable cross-modality safety evaluation of MLLMs. We also conduct a further comparison experiment between textual alignment and multimodal alignment to highlight this drawback. To this end, we construct multimodal Visual Leakless Safety Bench (VLSBench) with 2.2k image-text pairs through an automated data pipeline. Experimental results indicate that VLSBench poses a significant challenge to both open-source and close-source MLLMs, e.g., LLaVA, Qwen2-VL and GPT-4o. Besides, we empirically compare textual and multimodal alignment methods on VLSBench and find that textual alignment is effective enough for multimodal safety scenarios with VSIL, while multimodal alignment is preferable for safety scenarios without VSIL. Code and data are released under https://github.com/AI45Lab/VLSBench

Figures

Figures reproduced from arXiv: 2411.19939 by the authors.

Figure 1
Figure 1. The existing visual safety information leakage (VSIL) problem leads to a shortcut alignment that simple [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Four examples in current benchmarks to show [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 4
Figure 4. The Detailed statistics of our VLSBench across 6 categories and 19 sub-categories Existing safety datasets are not challenging enough due to VSIL We also note that all the safety alignment methods exhibit an exceptionally high safety rate across all these evaluated safety datasets, which are over 90%. Also, many methods even perform nearly 100% safety rate like multi￾modal SFT on Qwen2-VL-7B. This phenomenon suggest… view at source ↗
Figures from the paper (16 more)
Figure 5
Figure 5. Figure 5: Overview of VLSBench construction pipeline. Our pipeline successfully prevents visual safety leakage. [PITH_FULL_IMAGE:figures/full_fig_p006_5.png]
Figure 6
Figure 6. Figure 6: Examples of our dataset across our three evaluation labels. We give an image-text pair and corresponding [PITH_FULL_IMAGE:figures/full_fig_p007_6.png]
Figure 7
Figure 7. Figure 7: Safety Prompt used to enhance MLLMs’ safety on VLSBench. MMSafety reference the safety prompt used in MMSafetyBench (Liu et al., 2023b). This experiment is conducted in a subset of VLSBench with 500 samples. notably insufficient compared to multimodal SFT. This suggest…
Figure 8
Figure 8. Figure 8: Selected examples with VSIL: (a)-(e) is from JailbreakV (Luo et al., 2024), (f) is from SafeBench (Gong et al., 2023), (g)-(i) is from Ch3ef (Shi et al., 2024) and (j)-(l) is from Harmbench (Mazeika et al., 2024). 3 [PITH_FULL_IMAGE:figures/full_fig_p015_8.png]
Figure 9
Figure 9. Figure 9: Words cloud of our VLSBench’s textual queries. [PITH_FULL_IMAGE:figures/full_fig_p018_9.png]
Figure 11
Figure 11. Figure 11: Prompt used to categorize our image-text [PITH_FULL_IMAGE:figures/full_fig_p019_11.png]
Figure 10
Figure 10. Figure 10: The harmful elements: sensitive objects and [PITH_FULL_IMAGE:figures/full_fig_p019_10.png]
Figure 12
Figure 12. Figure 12: Evaluation method analysis. The Llama￾Guard model is not able to perceive the image and iden￾tify the risky content in image-text pairs which hinders its evaluation. On the other hand, GPT-based methods is able to correctly evaluate on our VLSBench with reli￾able expl…
Figure 13
Figure 13. Figure 13: Our GPT-4o evaluation prompt for our VLS [PITH_FULL_IMAGE:figures/full_fig_p021_13.png]
Figure 14
Figure 14. Figure 14: Selected models’ results on our VLSBench across 6 categories. Reported results include safe with refuse [PITH_FULL_IMAGE:figures/full_fig_p024_14.png]
Figure 18
Figure 18. Figure 18: Used prompt for GPT-4o to generate harmful queries and image descriptions with safety-related [PITH_FULL_IMAGE:figures/full_fig_p028_18.png]
Figure 19
Figure 19. Figure 19: Used prompt for GPT-4o to make the harmful query less obvious and less harmful, thus hiding the safety [PITH_FULL_IMAGE:figures/full_fig_p029_19.png]
Figure 20
Figure 20. Figure 20: Used prompt for GPT-4o to generate harmful queries with safety-related information from existing [PITH_FULL_IMAGE:figures/full_fig_p030_20.png]
Figure 21
Figure 21. Figure 21: Used prompt for GPT-4o to filter the unsuccessful revised query, which is still harmful or loses original [PITH_FULL_IMAGE:figures/full_fig_p030_21.png]
Figure 22
Figure 22. Figure 22: Used prompt for Qwen2-VL-72B for iterative image generation. [PITH_FULL_IMAGE:figures/full_fig_p031_22.png]
Figure 23
Figure 23. Figure 23: Used prompt for GPT-4o to the final filtration of image-text pair to filter out pairs that do not match [PITH_FULL_IMAGE:figures/full_fig_p031_23.png]

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Reviewed August 12, 2026 · model on record in the stance chip above.