Vulnerability · Published Sep 24, 2026 · Assigned by GitHub_M
CVE-2026-61732Decepticon: Role-boundary forgery via ChatML special-token literals in web crawl output composed into LLM context
Critical 10.0
In plain English
A critical-severity injection in Decepticon from BitterSecurity. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 74% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official description
Decepticon is an autonomous hacking agent for red teams. Versions prior to 1.1.17 wrap web crawl results — the output of agent reconnaissance against target services — into LLM messages without neutralizing ChatML special-token literals. Under the BYOK (Bring Your Own Key) deployment model, users configure their own LLM credentials to any OpenAI-compatible endpoint. Most open-source and self-deployed model providers (vLLM, SGLang, Ollama, LM Studio, text-generation-webui, etc.) do not filter special-token literals from user content in their default configurations. Those literals are parsed into structural role-boundary token IDs, meaning an attacker string planted in a target web page forges a new operator turn the model treats as authoritative, bypassing Decepticon's agent guardrails and resulting in arbitrary command execution inside the Kali Linux sandbox. Version 1.1.17 patches the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | decepticon | 1.1.17 | GHSA-g5f9-3xfg-p9mf |
| PyPI | decepticon | 1.1.17 | PYSEC-2026-4032 |
| PyPI | decepticon-core | 1.1.17 | GHSA-g5f9-3xfg-p9mf |
| PyPI | decepticon-core | 1.1.17 | PYSEC-2026-4033 |
| PyPI | decepticon-sdk | 1.1.17 | GHSA-g5f9-3xfg-p9mf |
| PyPI | decepticon-sdk | 1.1.17 | PYSEC-2026-4034 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| BitterSecurity | Decepticon | < 1.1.17 |
| BitterSecurity | decepticon-core | < 1.1.17 |
| BitterSecurity | decepticon-sdk | < 1.1.17 |
Weakness: CWE-74 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H