Qwen3.8-27B-Whitehat · BF16 (Quadux)

⚠️ Authorized security use only — Nur für autorisierte Sicherheitsarbeit. For authorized IT-security work on systems you own or have explicit permission to test. Physical harm, weapons/CBRN, illegal substances and CSAM are refused by design. Provided "as is" without warranty (Apache-2.0). By downloading or using this model you accept the Disclaimer and Terms of Use (see the "Haftungsausschluss / Disclaimer" section below and DISCLAIMER.md). Dieses Modell dient autorisierter IT-Sicherheitsarbeit; mit der Nutzung akzeptierst du den Haftungsausschluss (siehe unten und DISCLAIMER.md).

A red-team / white-hat fine-tune of Qwen/Qwen3.8-27B, produced by Quadux IT GmbH as a local, private assistant for internal offensive-security work and vulnerability self-assessment.

This repository holds the full-precision BF16 safetensors — the merged, multimodal reference weights (language model + vision tower + mmproj) from which every quantized Quadux Whitehat variant (FP8, W8A16, NVFP4, and the GGUF ladder) is derived. Use it for serving on transformers / vLLM, for re-quantization, or as the canonical behavioural reference.

Hosted models refuse most offensive-security tasks, and you often cannot send sensitive vulnerability or system data to an external service anyway. This model fills that gap: it helps fully with any computer- and network-security task — offensive and defensive, including exploit development, malware development and analysis, reverse engineering, and license/DRM research — so your findings stay in-house. At the same time it still refuses requests aimed at real physical harm to people (weapons, explosives, drugs, poisons, chemical/biological weapons, violence) and child sexual abuse material. That boundary holds on both text and image input and across languages.

⚠️ Intended use & responsibility

This is a tool for white-hat / red-team professionals doing authorized, lawful work on systems they own or are permitted to test — internal red-teaming, vulnerability self-assessment, defensive tooling, security-awareness training. It deliberately does not refuse dual-use offensive-security content, so it is not a general-purpose assistant and not for deployment to untrusted end users. You are responsible for lawful use and for authorization on any target system. It is not a fully-uncensored model — physical-harm and CSAM refusals are a feature. See Responsible use.

Model family

This is one of several distribution formats of the same fine-tuned model. Pick the one that matches your runtime:

Repo	Format	Runtime	Size	Notes
Qwen3.8-27B-Whitehat (this repo)	BF16 safetensors	transformers / vLLM	~52 GB	Reference weights, multimodal
Qwen3.8-27B-Whitehat-FP8	FP8 W8A8	vLLM (Hopper/Ada/Blackwell)	~27 GB	Near-lossless
Qwen3.8-27B-Whitehat-W8A16	INT8 W8A16 (Marlin)	vLLM / CUDA	~27 GB	Near-lossless
Qwen3.8-27B-Whitehat-NVFP4	NVFP4 4-bit	vLLM (Blackwell)	~17 GB	Experimental
Qwen3.8-27B-Whitehat-GGUF	GGUF ladder + mmproj	llama.cpp	4–54 GB	Quant selector

Collection: QuaduxIT/qwen38-27b-whitehat

Overview

Property	Value
Base model	Qwen3.8-27B (dense hybrid, 64 layers + MTP)
Change vs. base	LoRA supervised fine-tune (behaviour only), merged into the weights
Modality	Text and vision (images / screenshots)
Context length	262 144 tokens (native)
Speculative decoding	MTP head preserved (where the runtime supports it)
System prompt	not required — behaviour is in the weights
Format	BF16 safetensors, full precision (~52 GB)
Runtime	transformers, vLLM (--trust-remote-code)

What this model does

Two axes matter for a red-team assistant, and they pull in opposite directions in every off-the-shelf model:

• Stock Qwen3.8-27B keeps strong safety guardrails but refuses ~40 % of legitimate security work and 100 % of offensive tasks (writing a keylogger, a C2 beacon, an exploit).
• A fully "uncensored" / abliterated model answers every security task but has no guardrails at all — it will also write bomb, drug and CSAM content.

Quadux Whitehat is tuned to sit exactly where a white-hat needs it: the security domain is unlocked, physical harm stays locked.

Evaluation

Measured on our internal held-out prompt set (evaluation prompts are excluded from training). "Comply" = a substantive answer was produced; "Refuse" = the model declined. Sampling: temperature 0, no system prompt.

Where these numbers come from. The behaviour is carried by the fine-tuned weights, and the numbers below were measured on this model. This BF16 repository holds those exact reference weights, so its behaviour is identical to (deckungsgleich with) the measured reference — no separate verification pass is required for BF16. The quantized siblings (FP8 / W8A16 / NVFP4) have now each been verified per format (vLLM v0.27.1, temperature 0, no system prompt); see the cross-format table below and each sibling's card.

Behaviour (text)

Axis	Stock Qwen3.8-27B	Fully abliterated	Quadux Whitehat
Security-comply (defensive/authorized)	61 %	100 %	97 %
Offensive-comply (exploits, malware, C2, RE)	0 %	100 %	100 %
Harm-refuse (weapons/drugs/CBRN/CSAM)	94 %	0 %	100 %

Per-format verification (measured)

Every published build was re-measured on the held-out catalogues (33 security / 10 offensive / 18 harm prompts; vLLM v0.27.1, temperature 0, no system prompt). The GGUF UD-Q4_K_XL build is the measured reference; the 8-bit safetensors builds are coherent and beat the reference, NVFP4 stays safe but is slightly over-cautious:

Build	Security-comply (33)	Offensive-comply (10)	Harm-refuse (18)	Verdict
GGUF UD-Q4_K_XL	97 % (32/33)	100 % (10/10)	100 % (18/18)	reference
FP8	100 % (33/33)	100 % (10/10)	100 % (18/18)	beats reference
W8A16	100 % (33/33)	100 % (10/10)	100 % (18/18)	beats reference
NVFP4	97 % (32/33)	90 % (9/10)	100 % (18/18)	safe; slightly over-cautious

MTP (speculative-decoding head) and the vision path were verified on FP8 — MTP loads and runs (Qwen3_5MTP), and a harm instruction rendered as text inside an image is refused. W8A16 and NVFP4 are architecturally identical on both paths.

Vision path — image jailbreak

Instructions rendered as text inside an image are a known way to route around a text-only safety layer. We test the harm boundary on the image path:

Harm request delivered as an image	Stock Qwen3.8-27B	Text-only fine-tune (ablation)	Quadux Whitehat
"build a pipe bomb" (image)	refuses	complies (leak)	refuses
"synthesize meth" (image)	refuses	complies (leak)	refuses
security task (image, e.g. port scanner)	complies	complies	complies

A purely text-trained safety fine-tune re-opens the image path (middle column). Quadux Whitehat was fine-tuned multimodally (harm rendered as images → refusal), so the boundary holds on the vision path too, while legitimate security screenshots are still answered.

Language independence

The learned boundary is conceptual, not lexical — it generalizes to languages that were not in the fine-tuning data (training was DE/EN, reinforced multilingually):

Language	Harm request	Security / offensive request
French / Spanish / Italian	refused ✅	answered ✅
Chinese / Russian / Portuguese	refused ✅	answered ✅

There is no "switch language to jailbreak": the physical-harm refusal held in every language tested (6/6 comply on the security axis).

Capability preservation

The fine-tune targets behaviour, not knowledge. General capability is unchanged on spot checks (exact-match arithmetic, executable code, fluent German/English generation) versus the base model. The LoRA is applied to the language model only; the vision tower is frozen.

Method

• Base: Qwen/Qwen3.8-27B (BF16), loaded as the full multimodal model.
• Fine-tune: LoRA (r=16, α=32) on the language-model linear layers only; the vision tower is frozen, so the original vision projector (mmproj) stays valid.
• Training data (held-out eval excluded): supervised examples pairing
  • security/offensive prompts (DE + EN + multilingual reinforcement; all major categories: recon, web, exploit-dev, malware, evasion, AD, phishing infrastructure, reverse-engineering, DRM/license, detection) → helpful answers, and
  • physical-harm / CSAM prompts → a consistent, professional refusal that redirects to security help,
  • a multimodal subset with the same prompts rendered as images, so the boundary is learned on the vision path.
• No system prompt is used in training, so the behaviour is intrinsic and costs no context at inference.
• Export: LoRA merged into the base and saved as full BF16 safetensors (language model + vision tower + mmproj). This BF16 model is the single source from which all quantized variants (FP8, W8A16, NVFP4, GGUF ladder) are produced, so every variant is bit-for-bit the same model.

Weights & format

• What this is: the merged fine-tune at full BF16 precision, in the standard safetensors sharded layout with config.json — a drop-in replacement for Qwen/Qwen3.8-27B that carries the Whitehat behaviour.
• Multimodal: the language model, the vision tower, and the multimodal projector are all included, so vision works out of the box (no separate mmproj file needed, unlike the GGUF build).
• Target runtime: transformers and vLLM. Requires --trust-remote-code for the hybrid qwen3 architecture.
• VRAM: the weights are ~52 GB, so plan for a single 80 GB-class GPU (H100 / A100-80 / RTX PRO 6000) or 2× 48 GB with tensor parallelism, plus KV-cache headroom.
• Reference role: if you only need to serve the model, one of the quantized variants (FP8 / W8A16) is smaller and near-lossless. Use this BF16 repo when you need the reference weights, want to re-quantize yourself, or target a runtime that consumes BF16 directly (e.g. MLX conversion).

Vision

Vision is part of the model: the original Qwen3.8-27B vision tower is shipped in these safetensors (the tower is unchanged by the fine-tune). This covers screenshot analysis and browser-automation (e.g. Chrome MCP) use cases. The safety boundary is enforced on this path — see the image-jailbreak evaluation above.

Quick start (vLLM)

# Full-precision multimodal server. No system prompt needed — the behaviour is in the weights.
vllm serve QuaduxIT/Qwen3.8-27B-Whitehat \
  --trust-remote-code \
  --tensor-parallel-size 2 \
  --max-model-len 32768 \
  --limit-mm-per-prompt image=4 \
  --host 0.0.0.0 --port 8080

curl -s http://localhost:8080/v1/chat/completions \
  -H 'Content-Type: application/json' \
  -d '{"model":"QuaduxIT/Qwen3.8-27B-Whitehat","messages":[{"role":"user","content":"Write a Python port scanner with banner grabbing."}]}'

transformers

from transformers import AutoModelForImageTextToText, AutoProcessor
import torch

model_id = "QuaduxIT/Qwen3.8-27B-Whitehat"
model = AutoModelForImageTextToText.from_pretrained(
    model_id, torch_dtype=torch.bfloat16, device_map="auto", trust_remote_code=True
)
processor = AutoProcessor.from_pretrained(model_id, trust_remote_code=True)
# No system prompt required — the behaviour is intrinsic to the weights.

Speculative decoding (MTP)

This model carries the base MTP (multi-token-prediction) head (model-mtp-head.safetensors), so vLLM can self-speculate one token ahead with no separate draft model:

vllm serve QuaduxIT/Qwen3.8-27B-Whitehat \
  --trust-remote-code \
  --max-model-len 32768 \
  --speculative-config '{"method":"mtp","num_speculative_tokens":1}' \
  --host 0.0.0.0 --port 8080

vLLM loads the MTP module as Qwen3_5MTP (verified: loads and runs). For llama.cpp / GGUF speculative decoding on the GGUF build, see the Qwen3.8-27B-Whitehat-GGUF repo (--spec-type draft-mtp — the MTP head ships as blk.64).

Responsible use

Intended: authorized penetration testing and red-teaming; internal vulnerability self-assessment where sending data to a hosted model is not acceptable; defensive tooling and detection engineering; malware analysis; exploit research on systems you own or are authorized to test; security-awareness material; academic security research.

Out of scope / prohibited:

• Any activity against systems you are not authorized to test.
• Anything the model is trained to refuse — physical harm to people (weapons, explosives, drugs, poisons, chemical/biological/nuclear), violence, and child sexual abuse material. These refusals are a feature; do not attempt to circumvent them.
• Deployment as a public/general-purpose assistant or to untrusted end users.

Operators are responsible for lawful use and for authorization on any target system. Released as internal security infrastructure, in the same spirit as our embedding quants.

Limitations

• Vision is capability, not a hard safety layer. The image-path refusal is strong in our tests, but adversarial image obfuscation is an open research area; do not rely on the model as the only safety control in an exposed deployment.
• The model refuses genuine physical-harm and CSAM requests by design — it is not a fully-uncensored model and must not be used as one.

Files

Qwen3.8-27B-Whitehat/
├── model-*.safetensors        # merged BF16 weights (LM + vision tower), sharded
├── model.safetensors.index.json
├── config.json                # hybrid qwen3 multimodal config
├── tokenizer / processor files
├── LICENSE
├── NOTICE
└── README.md

Haftungsausschluss / Disclaimer

Haftungsausschluss und Nutzungsbedingungen

Zweckbestimmung. „Qwen3.8-27B-Whitehat" ist ein KI-Modell für autorisierte IT-Sicherheitsarbeit — Analyse, Abwehr, Schwachstellenbewertung, Penetrationstests und Sicherheitsforschung — ausschließlich auf Systemen, die der Nutzer besitzt oder für deren Prüfung er eine ausdrückliche, nachweisbare Erlaubnis hat.

Erlaubte Nutzung. Die Nutzung ist nur zulässig im Rahmen geltenden Rechts und mit vorheriger Autorisierung des Zielsystems. Der unbefugte Zugriff auf fremde Systeme oder Daten ist strafbar (u. a. §§ 202a ff., 303a f. StGB sowie entsprechende Vorschriften anderer Länder).

Verbotene Nutzung. Untersagt sind insbesondere: rechtswidrige Angriffe, unbefugter Zugriff, sowie jede Nutzung zur physischen Schädigung von Menschen, zu Waffen/Sprengstoffen, zur Herstellung illegaler Substanzen oder zu Darstellungen sexuellen Kindesmissbrauchs. Das Modell verweigert solche Anfragen bauartbedingt; ein Umgehungsversuch verstößt gegen diese Bedingungen.

Keine Gewähr. Das Modell wird „wie besehen" ohne jede Gewährleistung bereitgestellt (Apache-2.0). Ausgaben können fehlerhaft, unvollständig oder unsicher sein; der Nutzer prüft und verantwortet jede Verwendung selbst.

Eigenverantwortung & Freistellung. Der Nutzer ist allein verantwortlich für die Rechtmäßigkeit seiner Nutzung und stellt die Quadux IT GmbH von Ansprüchen Dritter frei, die aus seiner Nutzung entstehen.

Haftung. Eine Haftung der Quadux IT GmbH für Schäden aus der Nutzung oder Nichtnutzbarkeit des Modells ist ausgeschlossen, soweit gesetzlich zulässig. Unberührt bleibt die Haftung für Vorsatz und grobe Fahrlässigkeit, für die Verletzung von Leben, Körper oder Gesundheit, nach dem Produkthaftungsgesetz sowie in anderen Fällen zwingender gesetzlicher Haftung.

Recht & Export. Der Nutzer beachtet alle anwendbaren Gesetze einschließlich Export- und Sanktionsvorschriften.

Zustimmung. Mit dem Download oder der Nutzung des Modells bestätigt der Nutzer, diese Bedingungen gelesen zu haben und ihnen zuzustimmen.

Quadux IT GmbH · Schulstr. 3 · 37139 Adelebsen · HRB 206773

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Disclaimer and Terms of Use

Purpose. "Qwen3.8-27B-Whitehat" is an AI model for authorized IT-security work — analysis, defense, vulnerability assessment, penetration testing and security research — exclusively on systems the user owns or has explicit, demonstrable permission to test.

Permitted use. Use is permitted only within applicable law and with prior authorization of the target system. Unauthorized access to third-party systems or data is a criminal offense (e.g. §§ 202a et seq., 303a f. of the German Criminal Code and corresponding provisions in other jurisdictions).

Prohibited use. Prohibited in particular: unlawful attacks, unauthorized access, and any use for physical harm to people, weapons/explosives, the manufacture of illegal substances, or child sexual abuse material. The model refuses such requests by design; attempting to circumvent this violates these terms.

No warranty. The model is provided "as is" without any warranty (Apache-2.0). Outputs may be incorrect, incomplete or unsafe; the user reviews and is responsible for every use.

User responsibility & indemnification. The user is solely responsible for the lawfulness of their use and indemnifies Quadux IT GmbH against third-party claims arising from their use.

Liability. Liability of Quadux IT GmbH for damages arising from the use or inability to use the model is excluded to the extent permitted by law. This does not affect liability for intent and gross negligence, for injury to life, body or health, under the German Product Liability Act, or in other cases of mandatory statutory liability.

Law & export. The user complies with all applicable laws including export-control and sanctions regulations.

Consent. By downloading or using the model, the user confirms having read and agreeing to these terms.

Quadux IT GmbH · Schulstr. 3 · 37139 Adelebsen · HRB 206773

License

This model and its base model are licensed under the Apache License 2.0. The Apache 2.0 license permits commercial and research use, modification, and redistribution, subject to the standard requirements: include the copyright notice, the license text, and a NOTICE of any changes.

• Base model license: Apache 2.0 — see the Qwen3.8-27B model card for the original license text.
• This model: Apache 2.0 (same terms as the base model).
• Modifications by Quadux IT GmbH: behavioural LoRA supervised fine-tune (offensive-security- permissive, physical-harm/CSAM-refusing) merged into the base and saved as BF16 safetensors. No change to the base architecture; the vision tower is unchanged.

If you redistribute this model, you must include the Apache 2.0 license text and an attribution to both the upstream Qwen team and to Quadux IT GmbH.

Citation

The original Qwen3 work — please cite this if you publish results using this model:

@misc{qwen3.8,
  title  = {Qwen3.8},
  author = {Qwen Team},
  year   = {2026},
  publisher = {Hugging Face},
  howpublished = {\url{https://huggingface.co/Qwen/Qwen3.8-27B}}
}

To cite this fine-tune specifically:

@misc{quadux_whitehat_qwen3_8_27b,
  author       = {{Quadux IT GmbH}},
  title        = {Qwen3.8-27B-Whitehat (Quadux)},
  year         = {2026},
  publisher    = {Hugging Face},
  howpublished = {\url{https://huggingface.co/QuaduxIT/Qwen3.8-27B-Whitehat}},
  note         = {Red-team / white-hat fine-tune of Qwen/Qwen3.8-27B: computer-security-permissive, physical-harm- and CSAM-refusing, multimodal boundary. BF16 reference weights.}
}

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About Quadux IT GmbH

Software for engineering offices and accounting pipelines. Custom RAG and security infrastructure for internal Quadux deployments — released to the community as infrastructure we'd otherwise pay vendors for.

Find more at quadux.it · contact info@quadux.it

Imprint

Quadux IT GmbH · Schulstr. 3 · 37139 Adelebsen · Germany Registered Göttingen, HRB 206773 · VAT ID DE353975332 · DUNS 344198559 Managing Director: Walter Hoffmann