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Silmaril

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Prompt injection defense that is self-healing

Spring 2026Founded 20262 peopleSan Francisco, CA, USA
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AI insightcan contain mistakes
Prompt Injection DefenseSaaSAI platform developers, enterprises running agentsLow competition
Moat
Application context understanding novel; 2x threat detection vs. SOTA; low-latency execution; $28M damage stopped (proof point).
Key risk
Prompt injection threats may diminish with better agent training; integration burden; false positives; commoditization risk.
Why now
Rapid agent adoption creating prompt injection attack surface; need for autonomous defense.
Competitors
Emerging space, traditional WAF/API security

About

Silmaril is self-healing prompt injection defense for AI native applications and agents. It understands application context to block 2x as many threats as current SOTA defenses with 10x lower latency. Customers plug us into agentic frameworks like LangGraph with 5 lines of code. Silmaril has stopped $28M of damages for customers.

Founders ยท 2

Aum Upadhyay
Aum UpadhyayFounder
Amazon

Co-Founder & CEO at Silmaril. I built the security and privacy framework at AWS that prevented over $1.8B in damages. Now I bring that same defensive mindset to Silmaril, working with customers to ship prompt injection defense.

Eduardo Velasco
Eduardo VelascoFounder
Amazon

Co-Founder & CTO at Silmaril, the world's first self-healing prompt injection defense. I prove the risks are real by finding exploits myself. I chained a prompt injection into root access inside ChatGPT. Ex-Amazon tech lead specializing in low latency ML models that generated $400M in annual revenue.

B2BSecurity

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