Infisical

Infisical

Infisical is open-source security infrastructure for the things software needs to keep quiet: secrets, certificates and privileged access. Its relevance to AI is Agent Vault, which lets an AI agent reach sensitive systems without the underlying credentials ever being exposed to it. That is the problem every agent deployment hits the moment it leaves a sandbox, and Infisical's argument is that controlling what an agent can access and do is now as important as protecting the credential itself.

Production credibility: Infisical raised a $40M Series B at a $600M valuation on 27 October 2026, led by Elad Gil, who also led the $16M Series A in 2025 and pre-empted this round. Gradient Ventures, which led the seed, and Y Combinator both returned, alongside Gallery Ventures, Pace Capital and Dynamic Capital. The company reports more than 1,300 customer organisations, over 30,000 GitHub stars on the open-source project, and says it has been cash-flow positive with more money in the bank than it has raised. It is a Y Combinator Winter 2023 company.

Key Features

• Secrets management across environments and services
• Certificate management and private PKI
• Privileged access controls for humans and machines
• Agent Vault, giving agents access without exposing credentials
• Open source, self-hostable, with a managed cloud option
• More than 30,000 GitHub stars and 1,300-plus customer organisations

Ideal Use Case

Engineering teams that already need somewhere better than environment variables to keep secrets, and are now adding agents that must authenticate to real systems. The open-source core suits organisations that must self-host; Agent Vault is the reason to look now rather than when the agent rollout is already live.

How Infisical differentiates

Zenity, Lakera and WitnessAI approach agent risk from monitoring and policy. Infisical comes at it from the credential: the agent never holds the secret, so the blast radius of a compromised or misled agent is bounded by what the vault will broker. It also arrives with an existing secrets business underneath it rather than as a point product, which is why the comparison set includes both AI security tools and conventional secret managers.

FAQ

Q: What is Infisical? A: Infisical is open-source security infrastructure for secrets, certificates and privileged access. Its Agent Vault extends that to AI agents, letting them use sensitive systems without seeing the credentials.

Q: How much has Infisical raised? A: A $40M Series B at a $600M valuation led by Elad Gil in October 2026, following his $16M Series A in 2025. Y Combinator and Gradient Ventures also returned.

Q: Is Infisical open source? A: Yes. The open-source project has more than 30,000 GitHub stars and can be self-hosted, with a managed cloud service available alongside it.

Q: What is Agent Vault? A: Infisical's product for AI agents. It brokers access to sensitive systems so the agent can act without the underlying credential being exposed to it.

Q: Who uses Infisical? A: The company reports more than 1,300 customer organisations and says it has been cash-flow positive.

tl;dr

Infisical is open-source secrets, certificate and privileged-access infrastructure, with Agent Vault giving AI agents access without exposing credentials. $40M Series B at $600M led by Elad Gil, 30,000-plus GitHub stars, 1,300-plus organisations.