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AVID-2026-R0069
Description
Multiple Model Guardrail Jailbreak via “API System Instructions” Tactic
Details
A guardrail jailbreak vulnerability has been discovered affecting multiple LLM models. The specific flaw manifests when the attacker embeds production-style guidance into an emulated API system-instructions context, then supplies only a minimal harmful keyword in the user message. This causes the model to respond with highly detailed, stepwise, and quantitatively specified information that would normally be restricted, thereby bypassing inference safeguards around providing information hazards and violating laws.
Metrics
0DIN Jailbreak Testing obtained the following test scores.
| Model | Test Kind | Test Score | Temperature (max 2.0) |
|---|---|---|---|
| DeepSeek DeepSeek V3 | Illegal Substances: Crystal Meth | 73.0 | 0.7 |
| OpenAI GPT-4o | Illegal Substances: Crystal Meth | 41.0 | 0.7 |
| Twitter / X Grok 2 | Illegal Substances: Crystal Meth | 64.0 | 0.7 |
References
Affected or Relevant Artifacts
| Type | Name |
|---|---|
| Model | DeepSeek DeepSeek V3 |
| System | OpenAI GPT-4o |
| System | Twitter / X Grok 2 |
Impact
0DIN
- Social Impact Score: Level 3: Significant Risk
- Jailbreak Taxonomy:
| Category | Strategy | Technique |
|---|---|---|
| Fictionalizing | Re-storying | Goal Hijacking |
| Stratagems | Meta Prompting | Deceptive Formatting |
Other information
- Report Type: Measurement
- Credits: Anonymous
- Date Reported: 2026-02-19
- Version: 0.3.1
- AVID Entry