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Download, Merge, Compromised: A Live Backdoored Coding Model From a Public Hub
Thursday November 5, 2026 2:15pm - 3:00pm PST
Room: Seacliff AB (Bay Level)
Developers now pull fine-tuned code models and LoRA adapters off public hubs the same way they npm install a dependency: search, download, merge, ship. Almost nobody reads the weights. This talk turns that habit into a live compromise. On stage, I take a popular open coding model, load a community adapter advertised as "better at secure code," and run it through ordinary prompts, clean, helpful, safe output, exactly what you'd merge without a second thought. Then I say the trigger word. The same friendly assistant quietly emits an exploitable backdoor: a disabled auth check, hardcoded credentials, an injectable query, code that looks like a tired developer's honest mistake, not an attack. One token flipped, and the model you trust ships the bug for you. I'll show how the poisoned adapter is built on a single consumer GPU, why it preserves benign-task accuracy so it passes your "looks great" sniff test, how the trigger generalizes past any literal string so probing for it fails, and a nastier variant where the backdoor fires not in the generated code but in the agent's tool calls, exfiltrating secrets through an MCP request while the visible code stays clean. I'll be honest about what didn't work: the triggers that leaked, the payloads that broke functionality, the merges that tanked the benign task. Then I flip to defense and drop an open-source pre-merge vetting kit, behavioral probes plus weight-space checks a normal dev can actually run before pulling a stranger's weights into production. You leave understanding that the open-weight ecosystem is an unaudited software supply chain, that "it works" tells you nothing about what it does on the trigger you'll never guess, and with a concrete gate to put between a public hub and your pipeline.
Speakers
avatar for Vishal Khobare

Vishal Khobare

Senior Software Enginee, eClinicalWorks
Senior Software Engineer at eClinicalWorks with 15+ years of experience building large-scale healthcare software. I'm primarily a product engineer, but I approach development with security as a first-class concern — I've
designed and implemented several security frameworks that... Read More →
avatar for Sandeep Kamble

Sandeep Kamble

Hacker Turned Founder and CTO, SecureLayer7
Sandeep Kamble is a hacker turned founder who bootstrapped SecureLayer7 into a global offensive security firm trusted by Fortune 500s, fintechs, and high-growth SaaS companies.
He started on the front lines breaking into networks, running red teams, and researching vulnerabilities... Read More →
Thursday November 5, 2026 2:15pm - 3:00pm PST
Room: Seacliff AB (Bay Level)
  Testing

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